meta-quanta: gbs: add kernel config and drivers

1. set kernel config for GBS machine
2. add AMD CPU temperature hwmon driver
3. add seven segment display drivers

(From meta-quanta rev: d9f9d7eb3809821b07887c2adf4e45103582eefa)

Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: If2f42e43e043ea277a455a208968927b7053d2c0
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>

5 files changed, 1007 insertions, 0 deletions

diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch
new file mode 100644
index 000000000..b690a9813
--- /dev/null
+++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch
@@ -0,0 +1,327 @@
+SB Temperature Sensor Interface (SB-TSI) is an SMBus compatible
+interface that reports AMD SoC's Ttcl (normalized temperature),
+and resembles a typical 8-pin remote temperature sensor's I2C interface
+to BMC.
+
+This commit adds basic support using this interface to read CPU
+temperature, and read/write high/low CPU temp thresholds.
+
+To instantiate this driver on an AMD CPU with SB-TSI
+support, the i2c bus number would be the bus connected from the board
+management controller (BMC) to the CPU. The i2c address is specified in
+Section 6.3.1 of the spec [1]: The SB-TSI address is normally 98h for socket 0
+and 90h for socket 1, but it could vary based on hardware address select pins.
+
+[1]: https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf
+
+Test status: tested reading temp1_input, and reading/writing
+temp1_max/min.
+
+Signed-off-by: Kun Yi <kunyi at google.com>
+---
+ drivers/hwmon/Kconfig      |  10 ++
+ drivers/hwmon/Makefile     |   1 +
+ drivers/hwmon/sbtsi_temp.c | 259 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 270 insertions(+)
+ create mode 100644 drivers/hwmon/sbtsi_temp.c
+
+diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
+index 05a30832c6ba..9585dcd01d1b 100644
+--- a/drivers/hwmon/Kconfig
++++ b/drivers/hwmon/Kconfig
+@@ -1412,6 +1412,16 @@ config SENSORS_RASPBERRYPI_HWMON
+ 	  This driver can also be built as a module. If so, the module
+ 	  will be called raspberrypi-hwmon.
+ 
++config SENSORS_SBTSI
++	tristate "Emulated SB-TSI temperature sensor"
++	depends on I2C
++	help
++	  If you say yes here you get support for emulated temperature
++	  sensors on AMD SoCs with SB-TSI interface connected to a BMC device.
++
++	  This driver can also be built as a module. If so, the module will
++	  be called sbtsi_temp.
++
+ config SENSORS_SHT15
+ 	tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
+ 	depends on GPIOLIB || COMPILE_TEST
+diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
+index b0b9c8e57176..cd109f003ce4 100644
+--- a/drivers/hwmon/Makefile
++++ b/drivers/hwmon/Makefile
+@@ -152,6 +152,7 @@ obj-$(CONFIG_SENSORS_POWR1220)  += powr1220.o
+ obj-$(CONFIG_SENSORS_PWM_FAN)	+= pwm-fan.o
+ obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON)	+= raspberrypi-hwmon.o
+ obj-$(CONFIG_SENSORS_S3C)	+= s3c-hwmon.o
++obj-$(CONFIG_SENSORS_SBTSI)	+= sbtsi_temp.o
+ obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
+ obj-$(CONFIG_SENSORS_SCH5627)	+= sch5627.o
+ obj-$(CONFIG_SENSORS_SCH5636)	+= sch5636.o
+diff --git a/drivers/hwmon/sbtsi_temp.c b/drivers/hwmon/sbtsi_temp.c
+new file mode 100644
+index 000000000000..e3ad6a9f7ec1
+--- /dev/null
++++ b/drivers/hwmon/sbtsi_temp.c
+@@ -0,0 +1,259 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * sbtsi_temp.c - hwmon driver for a SBI Temperature Sensor Interface (SB-TSI)
++ *                compliant AMD SoC temperature device.
++ *
++ * Copyright (c) 2020, Google Inc.
++ * Copyright (c) 2020, Kun Yi <kunyi at google.com>
++ */
++
++#include <linux/err.h>
++#include <linux/i2c.h>
++#include <linux/init.h>
++#include <linux/hwmon.h>
++#include <linux/module.h>
++#include <linux/mutex.h>
++#include <linux/of_device.h>
++#include <linux/of.h>
++
++/*
++ * SB-TSI registers only support SMBus byte data access. "_INT" registers are
++ * the integer part of a temperature value or limit, and "_DEC" registers are
++ * corresponding decimal parts.
++ */
++#define SBTSI_REG_TEMP_INT		0x01 /* RO */
++#define SBTSI_REG_STATUS		0x02 /* RO */
++#define SBTSI_REG_CONFIG		0x03 /* RO */
++#define SBTSI_REG_TEMP_HIGH_INT		0x07 /* RW */
++#define SBTSI_REG_TEMP_LOW_INT		0x08 /* RW */
++#define SBTSI_REG_TEMP_DEC		0x10 /* RW */
++#define SBTSI_REG_TEMP_HIGH_DEC		0x13 /* RW */
++#define SBTSI_REG_TEMP_LOW_DEC		0x14 /* RW */
++#define SBTSI_REG_REV			0xFF /* RO */
++
++#define SBTSI_CONFIG_READ_ORDER_SHIFT	5
++
++#define SBTSI_TEMP_MIN	0
++#define SBTSI_TEMP_MAX	255875
++#define SBTSI_REV_MAX_VALID_ID	4
++
++/* Each client has this additional data */
++struct sbtsi_data {
++	struct i2c_client *client;
++	struct mutex lock;
++};
++
++/*
++ * From SB-TSI spec: CPU temperature readings and limit registers encode the
++ * temperature in increments of 0.125 from 0 to 255.875. The "high byte"
++ * register encodes the base-2 of the integer portion, and the upper 3 bits of
++ * the "low byte" encode in base-2 the decimal portion.
++ *
++ * e.g. INT=0x19, DEC=0x20 represents 25.125 degrees Celsius
++ *
++ * Therefore temperature in millidegree Celsius =
++ *   (INT + DEC / 256) * 1000 = (INT * 8 + DEC / 32) * 125
++ */
++static inline int sbtsi_reg_to_mc(s32 integer, s32 decimal)
++{
++	return ((integer << 3) + (decimal >> 5)) * 125;
++}
++
++/*
++ * Inversely, given temperature in millidegree Celsius
++ *   INT = (TEMP / 125) / 8
++ *   DEC = ((TEMP / 125) % 8) * 32
++ * Caller have to make sure temp doesn't exceed 255875, the max valid value.
++ */
++static inline void sbtsi_mc_to_reg(s32 temp, u8 *integer, u8 *decimal)
++{
++	temp /= 125;
++	*integer = temp >> 3;
++	*decimal = (temp & 0x7) << 5;
++}
++
++static int sbtsi_read(struct device *dev, enum hwmon_sensor_types type,
++		      u32 attr, int channel, long *val)
++{
++	struct sbtsi_data *data = dev_get_drvdata(dev);
++	s32 temp_int, temp_dec;
++	int err, reg_int, reg_dec;
++	u8 read_order;
++
++	if (type != hwmon_temp)
++		return -EINVAL;
++
++	read_order = 0;
++	switch (attr) {
++	case hwmon_temp_input:
++		/*
++		 * ReadOrder bit specifies the reading order of integer and
++		 * decimal part of CPU temp for atomic reads. If bit == 0,
++		 * reading integer part triggers latching of the decimal part,
++		 * so integer part should be read first. If bit == 1, read
++		 * order should be reversed.
++		 */
++		err = i2c_smbus_read_byte_data(data->client, SBTSI_REG_CONFIG);
++		if (err < 0)
++			return err;
++
++		read_order = (u8)err & BIT(SBTSI_CONFIG_READ_ORDER_SHIFT);
++		reg_int = SBTSI_REG_TEMP_INT;
++		reg_dec = SBTSI_REG_TEMP_DEC;
++		break;
++	case hwmon_temp_max:
++		reg_int = SBTSI_REG_TEMP_HIGH_INT;
++		reg_dec = SBTSI_REG_TEMP_HIGH_DEC;
++		break;
++	case hwmon_temp_min:
++		reg_int = SBTSI_REG_TEMP_LOW_INT;
++		reg_dec = SBTSI_REG_TEMP_LOW_DEC;
++		break;
++	default:
++		return -EINVAL;
++	}
++
++	if (read_order == 0) {
++		temp_int = i2c_smbus_read_byte_data(data->client, reg_int);
++		temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec);
++	} else {
++		temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec);
++		temp_int = i2c_smbus_read_byte_data(data->client, reg_int);
++	}
++
++	if (temp_int < 0)
++		return temp_int;
++	if (temp_dec < 0)
++		return temp_dec;
++
++	*val = sbtsi_reg_to_mc(temp_int, temp_dec);
++
++	return 0;
++}
++
++static int sbtsi_write(struct device *dev, enum hwmon_sensor_types type,
++		       u32 attr, int channel, long val)
++{
++	struct sbtsi_data *data = dev_get_drvdata(dev);
++	int reg_int, reg_dec, err;
++	u8 temp_int, temp_dec;
++
++	if (type != hwmon_temp)
++		return -EINVAL;
++
++	switch (attr) {
++	case hwmon_temp_max:
++		reg_int = SBTSI_REG_TEMP_HIGH_INT;
++		reg_dec = SBTSI_REG_TEMP_HIGH_DEC;
++		break;
++	case hwmon_temp_min:
++		reg_int = SBTSI_REG_TEMP_LOW_INT;
++		reg_dec = SBTSI_REG_TEMP_LOW_DEC;
++		break;
++	default:
++		return -EINVAL;
++	}
++
++	val = clamp_val(val, SBTSI_TEMP_MIN, SBTSI_TEMP_MAX);
++	mutex_lock(&data->lock);
++	sbtsi_mc_to_reg(val, &temp_int, &temp_dec);
++	err = i2c_smbus_write_byte_data(data->client, reg_int, temp_int);
++	if (err)
++		goto exit;
++
++	err = i2c_smbus_write_byte_data(data->client, reg_dec, temp_dec);
++exit:
++	mutex_unlock(&data->lock);
++	return err;
++}
++
++static umode_t sbtsi_is_visible(const void *data,
++				enum hwmon_sensor_types type,
++				u32 attr, int channel)
++{
++	switch (type) {
++	case hwmon_temp:
++		switch (attr) {
++		case hwmon_temp_input:
++			return 0444;
++		case hwmon_temp_min:
++			return 0644;
++		case hwmon_temp_max:
++			return 0644;
++		}
++		break;
++	default:
++		break;
++	}
++	return 0;
++}
++
++static const struct hwmon_channel_info *sbtsi_info[] = {
++	HWMON_CHANNEL_INFO(chip,
++			   HWMON_C_REGISTER_TZ),
++	HWMON_CHANNEL_INFO(temp,
++			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX),
++	NULL
++};
++
++static const struct hwmon_ops sbtsi_hwmon_ops = {
++	.is_visible = sbtsi_is_visible,
++	.read = sbtsi_read,
++	.write = sbtsi_write,
++};
++
++static const struct hwmon_chip_info sbtsi_chip_info = {
++	.ops = &sbtsi_hwmon_ops,
++	.info = sbtsi_info,
++};
++
++static int sbtsi_probe(struct i2c_client *client,
++		       const struct i2c_device_id *id)
++{
++	struct device *dev = &client->dev;
++	struct device *hwmon_dev;
++	struct sbtsi_data *data;
++
++	data = devm_kzalloc(dev, sizeof(struct sbtsi_data), GFP_KERNEL);
++	if (!data)
++		return -ENOMEM;
++
++	data->client = client;
++	mutex_init(&data->lock);
++
++	hwmon_dev =
++		devm_hwmon_device_register_with_info(dev, client->name, data,
++						     &sbtsi_chip_info, NULL);
++
++	return PTR_ERR_OR_ZERO(hwmon_dev);
++}
++
++static const struct i2c_device_id sbtsi_id[] = {
++	{"sbtsi", 0},
++	{}
++};
++MODULE_DEVICE_TABLE(i2c, sbtsi_id);
++
++static const struct of_device_id __maybe_unused sbtsi_of_match[] = {
++	{
++		.compatible = "amd,sbtsi",
++	},
++	{ },
++};
++MODULE_DEVICE_TABLE(of, sbtsi_of_match);
++
++static struct i2c_driver sbtsi_driver = {
++	.class = I2C_CLASS_HWMON,
++	.driver = {
++		.name = "sbtsi",
++		.of_match_table = of_match_ptr(sbtsi_of_match),
++	},
++	.probe = sbtsi_probe,
++	.id_table = sbtsi_id,
++};
++
++module_i2c_driver(sbtsi_driver);
++
++MODULE_AUTHOR("Kun Yi <kunyi at google.com>");
++MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor");
++MODULE_LICENSE("GPL");
+-- 
+2.26.0.292.g33ef6b2f38-goog
\ No newline at end of file
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch
new file mode 100644
index 000000000..a21707d8a
--- /dev/null
+++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch
@@ -0,0 +1,10 @@
+diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
+index b9e6d4c3e906..aa7ce9d72d2c 100644
+--- a/drivers/misc/Makefile
++++ b/drivers/misc/Makefile
+@@ -59,3 +59,5 @@ obj-$(CONFIG_HABANA_AI)		+= habanalabs/
+ obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
+ obj-$(CONFIG_NPCM7XX_LPC_BPC)	+= npcm7xx-lpc-bpc.o
+ obj-$(CONFIG_NPCM7XX_PCI_MBOX)	+= npcm7xx-pci-mbox.o
++obj-$(CONFIG_SEVEN_SEGMENT_DISPLAY)    += seven_seg_disp.o
++obj-$(CONFIG_SEVEN_SEGMENT_GPIO) += seven_seg_gpio.o
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch
new file mode 100644
index 000000000..8ae624a51
--- /dev/null
+++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch
@@ -0,0 +1,293 @@
+From 2d46e81d9bbb624695bac8400a4ac41b7f116ec4 Mon Sep 17 00:00:00 2001
+From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Date: Fri, 27 Jul 2018 12:34:54 -0700
+Subject: [PATCH 2/3] drivers: misc: Character device driver for seven segment
+ display
+
+Character device driver which implements the user-space
+API for letting a user write to two 7-segment displays including
+any conversion methods necessary to map the user input
+to two 7-segment displays.
+
+Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Signed-off-by: Kun Yi <kunyi@google.com>
+Signed-off-by: Benjamin Fair <benjaminfair@google.com>
+---
+ drivers/misc/Kconfig          |   8 ++
+ drivers/misc/Makefile         |   1 +
+ drivers/misc/seven_seg_disp.c | 201 ++++++++++++++++++++++++++++++++++
+ drivers/misc/seven_seg_disp.h |  34 ++++++
+ 4 files changed, 244 insertions(+)
+ create mode 100644 drivers/misc/seven_seg_disp.c
+ create mode 100644 drivers/misc/seven_seg_disp.h
+
+diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
+index 9d96469fb41c..d443de886346 100644
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -473,6 +473,14 @@ config VEXPRESS_SYSCFG
+ 	  bus. System Configuration interface is one of the possible means
+ 	  of generating transactions on this bus.
+ 
++config SEVEN_SEGMENT_DISPLAY
++        tristate "Character driver for seven segment display support"
++        help
++          Character device driver which implements the user-space
++          API for letting a user write to two 7-segment displays including
++          any conversion methods necessary to map the user input
++          to two 7-segment displays.
++
+ config PCI_ENDPOINT_TEST
+ 	depends on PCI
+ 	select CRC32
+
+diff --git a/drivers/misc/seven_seg_disp.c b/drivers/misc/seven_seg_disp.c
+new file mode 100644
+index 000000000000..db1c571f68e5
+--- /dev/null
++++ b/drivers/misc/seven_seg_disp.c
+@@ -0,0 +1,201 @@
++/*
++ * Copyright (c) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/module.h>
++#include <linux/version.h>
++#include <linux/kernel.h>
++#include <linux/types.h>
++#include <linux/kdev_t.h>
++#include <linux/fs.h>
++#include <linux/uaccess.h>
++#include <linux/ctype.h>
++#include <linux/of.h>
++#include <linux/io.h>
++#include <linux/slab.h>
++#include <linux/platform_device.h>
++
++#include "seven_seg_disp.h"
++
++#define LED_DOT 0x01
++
++/*
++ * 0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
++ *  _       _   _       _   _   _   _   _   _       _       _   _
++ * | |   |  _|  _| |_| |_  |_    | |_| |_| |_| |_  |    _| |_  |_
++ * |_|   | |_   _|   |  _| |_|   | |_|   | | | |_| |_  |_| |_  |
++ *
++ * data[7:1] = led[a:g]
++ */
++const u8 seven_seg_bits[] = {
++	0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0,
++	0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E
++	};
++
++/*
++ * 0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
++ *      _       _   _                              _            _
++ *     |   |_  |_| |_  _   _   _   _   _   _   _  |_    _|  _| | |
++ *     |_  |_  |   |                               _|  |_| |_| | |
++ *
++ * data[7:1] = led[a:g]
++ */
++const u8 special_seven_seg_bits[] = {
++	0x00, 0x9C, 0x1E, 0xCE, 0x8E, 0x02, 0x02, 0x02,
++	0x02, 0x02, 0x02, 0x02, 0xB6, 0x7A, 0x7A, 0xEC
++	};
++
++static dev_t seven_seg_devno;
++static struct class *seven_seg_disp_class;
++
++static int seven_seg_disp_open(struct inode *inode, struct file *filp)
++{
++	struct seven_seg_disp_dev *disp_dev;
++
++	disp_dev = container_of(inode->i_cdev,
++				 struct seven_seg_disp_dev, cdev);
++	filp->private_data = disp_dev;
++	return 0;
++}
++
++static int seven_seg_disp_close(struct inode *inode, struct file *filp)
++{
++	filp->private_data = NULL;
++	return 0;
++}
++
++static ssize_t seven_seg_disp_read(struct file *filp, char __user *buf, size_t
++				len, loff_t *off)
++{
++	struct seven_seg_disp_dev *disp_dev = filp->private_data;
++
++	if (disp_dev->disp_data_valid)
++		return -EINVAL;
++
++	if (copy_to_user(buf, disp_dev->seven_seg_disp_data_array,
++				MAX_DISP_CHAR_SIZE) != 0) {
++		return -EFAULT;
++	}
++
++	return 0;
++}
++
++static u16 convert_to_disp_data(char *buf)
++{
++	u8 low_display;
++	u8 high_display;
++	u16 led_value;
++
++	low_display = seven_seg_bits[hex_to_bin(buf[2])];
++
++	high_display = (buf[0] == '1') ?
++	special_seven_seg_bits[hex_to_bin(buf[1])] :
++	seven_seg_bits[hex_to_bin(buf[1])];
++
++	led_value = low_display | (high_display << 8);
++	if (buf[0] == '1')
++		led_value |= LED_DOT | (LED_DOT << 8);
++
++	return led_value;
++}
++
++static ssize_t seven_seg_disp_write(struct file *filp, const char __user *buf,
++				size_t len, loff_t *off)
++{
++	int length = len - 1;
++	int i;
++
++	struct seven_seg_disp_dev *disp_dev = filp->private_data;
++
++	if (length != MAX_DISP_CHAR_SIZE)
++		return -EINVAL;
++
++	if (copy_from_user(disp_dev->seven_seg_disp_data_array,
++				buf, length) != 0) {
++		return -EFAULT;
++	}
++
++	for (i = 0; i < MAX_DISP_CHAR_SIZE; i++) {
++		if (!isxdigit(disp_dev->seven_seg_disp_data_array[i]))
++			return -EINVAL;
++	}
++
++	disp_dev->current_seven_seg_disp_data = convert_to_disp_data(
++			disp_dev->seven_seg_disp_data_array);
++	disp_dev->disp_data_valid = true;
++	disp_dev->update_seven_seg_data(&disp_dev->parent,
++			disp_dev->current_seven_seg_disp_data);
++
++	return len;
++}
++
++static const struct file_operations seven_seg_disp_fops = {
++
++	.owner = THIS_MODULE,
++	.open = seven_seg_disp_open,
++	.release = seven_seg_disp_close,
++	.read = seven_seg_disp_read,
++	.write = seven_seg_disp_write
++};
++
++void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev)
++{
++	cdev_del(&disp_dev->cdev);
++	device_destroy(seven_seg_disp_class, seven_seg_devno);
++}
++
++int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev,
++	void (*update_disp_data)(struct device *, u16 data))
++{
++	struct device *dev;
++	int err;
++
++	dev = device_create(seven_seg_disp_class, NULL,
++			seven_seg_devno,
++			NULL, "seven_seg_disp_val");
++	if (dev == NULL)
++		return -EIO;
++	disp_dev->dev = dev;
++	disp_dev->update_seven_seg_data = update_disp_data;
++	disp_dev->disp_data_valid = false;
++
++	cdev_init(&disp_dev->cdev, &seven_seg_disp_fops);
++	err = cdev_add(&disp_dev->cdev, seven_seg_devno, 1);
++	if (err)
++		device_destroy(seven_seg_disp_class, seven_seg_devno);
++	return err;
++}
++
++static int __init seven_seg_disp_init(void)
++{
++	int err = alloc_chrdev_region(&seven_seg_devno, 0, 1, "disp_state");
++
++	if (err < 0)
++		return err;
++
++	seven_seg_disp_class = class_create(THIS_MODULE, "disp_state");
++	if (seven_seg_disp_class == NULL)
++		goto unreg_chrdev;
++
++	return 0;
++
++unreg_chrdev:
++	unregister_chrdev_region(seven_seg_devno, 1);
++	return -EIO;
++}
++
++static void __exit seven_seg_disp_exit(void)
++{
++	class_destroy(seven_seg_disp_class);
++	unregister_chrdev_region(seven_seg_devno, 1);
++}
++
++module_init(seven_seg_disp_init);
++module_exit(seven_seg_disp_exit);
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
++MODULE_DESCRIPTION("Seven segment display character driver");
+diff --git a/drivers/misc/seven_seg_disp.h b/drivers/misc/seven_seg_disp.h
+new file mode 100644
+index 000000000000..0ebed0802747
+--- /dev/null
++++ b/drivers/misc/seven_seg_disp.h
+@@ -0,0 +1,34 @@
++/*
++ * Copyright (c) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#ifndef SEVEN_SEG_DISP_H
++#define SEVEN_SEG_DISP_H
++
++#include <linux/device.h>
++#include <linux/cdev.h>
++
++#define MAX_DISP_CHAR_SIZE 3
++
++#define DEFAULT_REFRESH_INTERVAL_MS 600
++
++struct seven_seg_disp_dev {
++	bool disp_data_valid;
++	u16 current_seven_seg_disp_data;
++	char seven_seg_disp_data_array[MAX_DISP_CHAR_SIZE];
++	struct device parent;
++	struct device *dev;
++	struct cdev cdev;
++	void (*update_seven_seg_data)(struct device *, u16 data);
++};
++
++int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev,
++	void (*update_disp_data)(struct device *, u16 data));
++
++void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev);
++
++#endif
+-- 
+2.22.0.770.g0f2c4a37fd-goog
+
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch
new file mode 100644
index 000000000..b166c78b8
--- /dev/null
+++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch
@@ -0,0 +1,267 @@
+From ea3e732d2c4a609e621346a96d37713820640196 Mon Sep 17 00:00:00 2001
+From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Date: Fri, 27 Jul 2018 12:36:24 -0700
+Subject: [PATCH 3/3] drivers: misc: Platform driver for seven segment display
+ support
+
+Platform device driver which provides an API for displaying on two
+7-segment displays, and implements the required bit-banging.
+The hardware assumed is 74HC164 wired to two 7-segment displays.
+
+Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Signed-off-by: Kun Yi <kunyi@google.com>
+Signed-off-by: Benjamin Fair <benjaminfair@google.com>
+---
+ drivers/misc/Kconfig          |   8 ++
+#  drivers/misc/Makefile         |   2 ++
+ drivers/misc/seven_seg_gpio.c | 205 ++++++++++++++++++++++++++++++++++
+ 3 files changed, 215 insertions(+)
+ create mode 100644 drivers/misc/seven_seg_gpio.c
+
+diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
+index d443de886346..e10984e3288f 100644
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -481,6 +481,14 @@ config SEVEN_SEGMENT_DISPLAY
+           any conversion methods necessary to map the user input
+           to two 7-segment displays.
+ 
++config SEVEN_SEGMENT_GPIO
++        tristate "Platform driver to update seven segment display"
++        depends on SEVEN_SEGMENT_DISPLAY
++        help
++          Platform device driver which provides an API for displaying on two
++          7-segment displays, and implements the required bit-banging.
++          The hardware assumed is 74HC164 wired to two 7-segment displays.
++
+ config PCI_ENDPOINT_TEST
+ 	depends on PCI
+ 	select CRC32
+# diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
+# index 402bcc3c9961..f39bec664d92 100644
+# --- a/drivers/misc/Makefile
+# +++ b/drivers/misc/Makefile
+# @@ -53,6 +53,8 @@ obj-$(CONFIG_GENWQE)          += genwqe/
+#  obj-$(CONFIG_ECHO)             += echo/
+#  obj-$(CONFIG_VEXPRESS_SYSCFG)  += vexpress-syscfg.o
+#  obj-$(CONFIG_CXL_BASE)         += cxl/
+# +obj-$(CONFIG_SEVEN_SEGMENT_DISPLAY)    += seven_seg_disp.o
+# +obj-$(CONFIG_SEVEN_SEGMENT_GPIO) += seven_seg_gpio.o
+#  obj-$(CONFIG_ASPEED_LPC_CTRL)  += aspeed-lpc-ctrl.o
+#  obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
+#  obj-$(CONFIG_ASPEED_LPC_MBOX)  += aspeed-lpc-mbox.o
+
+diff --git a/drivers/misc/seven_seg_gpio.c b/drivers/misc/seven_seg_gpio.c
+new file mode 100644
+index 000000000000..e03ea7f8b848
+--- /dev/null
++++ b/drivers/misc/seven_seg_gpio.c
+@@ -0,0 +1,205 @@
++/*
++ * Copyright (C) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/timer.h>
++#include <linux/jiffies.h>
++#include <linux/sizes.h>
++#include <linux/io.h>
++#include <linux/delay.h>
++#include <linux/uaccess.h>
++#include <linux/mutex.h>
++#include <linux/of_platform.h>
++#include <linux/gpio/consumer.h>
++
++#include "seven_seg_disp.h"
++
++#define DELAY_INTVL_US 1
++
++#define CLOCK_GPIO_NAME "clock"
++#define DATA_GPIO_NAME "data"
++#define CLEAR_GPIO_NAME "clear"
++
++struct seven_seg_gpio_info {
++	u16 curr_disp_value;
++	u16 refresh_interval;
++	struct timer_list update_timer;
++	struct gpio_desc *clock_gpio;
++	struct gpio_desc *data_gpio;
++	struct gpio_desc *clear_gpio;
++};
++
++static void update_seven_seg_gpio_data(struct device *dev, u16 data)
++{
++	struct platform_device *pdev;
++	struct seven_seg_gpio_info *gpio_info;
++
++	pdev = container_of(dev, struct platform_device, dev);
++	if (pdev == NULL) {
++		pr_err("invalid NULL platform_device\n");
++		return;
++	}
++
++	gpio_info = platform_get_drvdata(pdev);
++	if (gpio_info == NULL) {
++		pr_err("invalid NULL gpio_info\n");
++		return;
++	}
++
++	gpio_info->curr_disp_value = data;
++}
++
++static void clear_seven_seg_gpio_data(struct device *dev, u16 data)
++{
++	struct platform_device *pdev;
++	struct seven_seg_gpio_info *gpio_info;
++
++	pdev = container_of(dev, struct platform_device, dev);
++	if (pdev == NULL) {
++		pr_err("invalid NULL platform_device\n");
++		return;
++	}
++
++	gpio_info = platform_get_drvdata(pdev);
++	if (gpio_info == NULL) {
++		pr_err("invalid NULL gpio_info\n");
++		return;
++	}
++
++	gpio_info->curr_disp_value = 0;
++}
++
++static void send_seven_seg_gpio_data(u16 disp_data,
++		struct seven_seg_gpio_info *gpio_info)
++{
++	int i;
++
++	gpiod_set_value(gpio_info->clear_gpio, 0);
++	udelay(DELAY_INTVL_US);
++	gpiod_set_value(gpio_info->clear_gpio, 1);
++	udelay(DELAY_INTVL_US);
++
++	for (i = 0; i < 16; i++) {
++		if (disp_data & 0x01)
++			gpiod_set_value(gpio_info->data_gpio, 1);
++		else
++			gpiod_set_value(gpio_info->data_gpio, 0);
++
++		udelay(DELAY_INTVL_US);
++
++		gpiod_set_value(gpio_info->clock_gpio, 0);
++		udelay(DELAY_INTVL_US);
++		gpiod_set_value(gpio_info->clock_gpio, 1);
++		udelay(DELAY_INTVL_US);
++
++		disp_data >>= 1;
++	}
++}
++
++static void disp_refresh_timer_handler(struct timer_list *t)
++{
++	u16 disp_data;
++	struct seven_seg_gpio_info *gpio_info =
++		from_timer(gpio_info, t, update_timer);
++	disp_data = gpio_info->curr_disp_value;
++
++	send_seven_seg_gpio_data(disp_data, gpio_info);
++	mod_timer(&gpio_info->update_timer,
++		jiffies + msecs_to_jiffies(gpio_info->refresh_interval));
++}
++
++static const struct of_device_id of_seven_seg_gpio_match[] = {
++		{ .compatible = "seven-seg-gpio-dev" },
++		{},
++};
++
++MODULE_DEVICE_TABLE(of, of_seven_seg_gpio_match);
++
++static int seven_seg_gpio_probe(struct platform_device *pdev)
++{
++	u16 interval;
++	int result;
++	struct seven_seg_gpio_info *gpio_info;
++	struct device *dev = &pdev->dev;
++	struct seven_seg_disp_dev *disp_dev;
++
++	gpio_info = devm_kzalloc(dev,
++			sizeof(struct seven_seg_gpio_info),
++			GFP_KERNEL);
++	if (gpio_info == NULL)
++		return -ENOMEM;
++
++	/* Requesting the clock gpio */
++	gpio_info->clock_gpio = devm_gpiod_get(dev, CLOCK_GPIO_NAME,
++		GPIOD_OUT_HIGH);
++	if (IS_ERR(gpio_info->clock_gpio))
++		return PTR_ERR(gpio_info->clock_gpio);
++
++	/* Requesting the data gpio */
++	gpio_info->data_gpio = devm_gpiod_get(dev, DATA_GPIO_NAME,
++		GPIOD_OUT_HIGH);
++	if (IS_ERR(gpio_info->data_gpio))
++		return PTR_ERR(gpio_info->data_gpio);
++
++	/* Requesting the clear gpio */
++	gpio_info->clear_gpio = devm_gpiod_get(dev, CLEAR_GPIO_NAME,
++		GPIOD_OUT_HIGH);
++	if (IS_ERR(gpio_info->clear_gpio))
++		return PTR_ERR(gpio_info->clear_gpio);
++
++	result = of_property_read_u16(pdev->dev.of_node,
++		"refresh-interval-ms", &interval);
++	gpio_info->refresh_interval = result ? DEFAULT_REFRESH_INTERVAL_MS :
++		interval;
++
++	/* Start timer to update seven segment display every second */
++	timer_setup(&gpio_info->update_timer, disp_refresh_timer_handler, 0);
++	result = mod_timer(&gpio_info->update_timer,
++			jiffies +
++			msecs_to_jiffies(gpio_info->refresh_interval));
++	if (result)
++		return result;
++
++	gpio_info->curr_disp_value = 0;
++
++	platform_set_drvdata(pdev, gpio_info);
++
++	disp_dev = devm_kzalloc(dev, sizeof(struct seven_seg_disp_dev),
++				GFP_KERNEL);
++	disp_dev->parent = *dev;
++	seven_seg_setup_cdev(disp_dev, &update_seven_seg_gpio_data);
++	return 0;
++}
++
++static int seven_seg_gpio_remove(struct platform_device *pdev)
++{
++	struct seven_seg_gpio_info *gpio_info = platform_get_drvdata(pdev);
++	struct seven_seg_disp_dev *disp_dev =
++				container_of(&pdev->dev,
++				struct seven_seg_disp_dev, parent);
++	seven_seg_rem_cdev(disp_dev);
++	del_timer_sync(&gpio_info->update_timer);
++	platform_set_drvdata(pdev, NULL);
++	return 0;
++}
++
++static struct platform_driver seven_seg_gpio_driver = {
++	.probe		= seven_seg_gpio_probe,
++	.remove		= seven_seg_gpio_remove,
++	.driver		= {
++		.name	= "seven-seg-gpio",
++		.of_match_table = of_seven_seg_gpio_match,
++	},
++};
++
++module_platform_driver(seven_seg_gpio_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
++MODULE_DESCRIPTION("Seven segment display driver using GPIO config");
+-- 
+2.22.0.770.g0f2c4a37fd-goog
+
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg
new file mode 100644
index 000000000..edd009c47
--- /dev/null
+++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg
@@ -0,0 +1,110 @@
+# Support full 1G memory for userspace on BMC
+CONFIG_VMSPLIT_3G_OPT=y
+CONFIG_NET_NCSI=y
+# Enable available sensors
+CONFIG_HWMON=y
+CONFIG_PMBUS=y
+CONFIG_SENSORS_PMBUS=y
+CONFIG_SENSORS_MAX34440=y
+CONFIG_SENSORS_LM75=y
+CONFIG_SENSORS_SBTSI=y
+CONFIG_SENSORS_ISL68137=y
+CONFIG_SENSORS_ADM1275=y
+CONFIG_NPCM7XX_ADC=y
+CONFIG_SENSORS_IIO_HWMON=y
+CONFIG_SENSORS_FAN=y
+CONFIG_SENSORS_JC42=y
+CONFIG_SENSORS_MAX31790=y
+CONFIG_SENSORS_UCD9000=y
+
+# Enable for firmware update LPC.
+CONFIG_DEVMEM=y
+
+# Enable seven seg display
+CONFIG_SEVEN_SEGMENT_DISPLAY=y
+CONFIG_SEVEN_SEGMENT_GPIO=y
+
+# Enable GPIO LEDS
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+CONFIG_LEDS_GPIO=y
+CONFIG_LEDS_TRIGGERS=y
+CONFIG_LEDS_TRIGGER_TIMER=y // Allow userspace to blink LEDs
+CONFIG_LEDS_TRIGGER_PANIC=y // Blink BMC fault when kernel panics
+CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
+CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+
+# Enable pstore(ramoops) to capture kernel panics
+CONFIG_PSTORE=y
+CONFIG_PSTORE_RAM=y
+CONFIG_PSTORE_DEFLATE_COMPRESS=y
+
+# Enable Nuvoton ECC
+CONFIG_EDAC_ATOMIC_SCRUB=y
+CONFIG_EDAC_DEBUG=y
+CONFIG_EDAC_LEGACY_SYSFS=y
+CONFIG_EDAC_NPCM7XX=y
+CONFIG_EDAC_SUPPORT=y
+CONFIG_EDAC=y
+CONFIG_RAS=y
+
+# Enable Nuvoton JTAG
+CONFIG_NPCM7XX_JTAG_MASTER=y
+
+# USB
+CONFIG_USB_CONFIGFS_ECM_SUBSET=y
+CONFIG_USB_CONFIGFS_ECM=y
+CONFIG_USB_CONFIGFS_EEM=y
+CONFIG_USB_CONFIGFS_F_HID=y
+CONFIG_USB_CONFIGFS_MASS_STORAGE=y
+CONFIG_USB_CONFIGFS_RNDIS=y
+CONFIG_USB_CONFIGFS=y
+CONFIG_USB_F_ECM=y
+CONFIG_USB_F_EEM=y
+CONFIG_USB_F_MASS_STORAGE=y
+CONFIG_USB_F_RNDIS=y
+CONFIG_USB_F_SUBSET=y
+CONFIG_USB_GADGET_NPCM_USB2=y
+CONFIG_USB_NPCM_UDC=y
+CONFIG_USB_OHCI_HCD_NPCM7XX=y
+CONFIG_USB_SERIAL_CP210X=y
+CONFIG_USB_U_ETHER=y
+
+#SPI
+CONFIG_SPI=y
+CONFIG_SPI_NPCM_FIU=y
+CONFIG_SPI_NPCM_PSPI=y
+
+#I2C support
+CONFIG_I2C_MUX_LTC4306=y
+CONFIG_I2C_MUX_PCA954x=y
+CONFIG_I2C_MUX=y
+CONFIG_I2C_SLAVE_EEPROM=y
+CONFIG_I2C_SLAVE_MQUEUE=y
+CONFIG_I2C_SLAVE=y
+
+#I2C GPIO expanders
+CONFIG_GPIO_PCA953X_IRQ=y
+CONFIG_GPIO_PCA953X=y
+CONFIG_GPIO_PCF857X=y
+
+# Misc
+CONFIG_OVERLAY_FS=y
+CONFIG_JFFS2_FS=y
+CONFIG_SQUASHFS_XZ=y
+CONFIG_SQUASHFS=y
+CONFIG_RESET_CONTROLLER=y
+CONFIG_RESET_NPCM=y
+CONFIG_IPVLAN=y
+CONFIG_VLAN_8021Q=y
+CONFIG_DEVKMEM=y
+CONFIG_EEPROM_AT24=y
+CONFIG_FORCE_MAX_ZONEORDER=12
+CONFIG_IIO_MUX=y
+CONFIG_IIO=y
+CONFIG_MEDIA_SUPPORT=y
+CONFIG_MFD_SYSCON=y
+CONFIG_MTD_M25P80=y
+CONFIG_MUX_MMIO=y
+CONFIG_NPCM7XX_LPC_BPC=y
+CONFIG_MTD_PARTITIONED_MASTER=y