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authorMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-09-10 09:00:13 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-09-10 19:56:41 +0300
commitd210a0023590dbebb2f547d1ca3fc845b223430a (patch)
treeb00d3a8a48a3e7993e73671e9d9d64de884ef523 /drivers/misc/hisi_hikey_usb.c
parent7a6ff4c4cbc3570a1ae483a833b3fb12b1a56a9d (diff)
downloadlinux-d210a0023590dbebb2f547d1ca3fc845b223430a.tar.xz
misc: hisi_hikey_usb: add support for Hikey 970
The HiKey 970 board is similar to Hikey 960 with regards to its USB configutation: it also relies on a USB HUB that is used when DWC3 is at host mode. However, it requires a few extra DT settings, as it uses a voltage regulator and GPIO reset pin. Add support for them. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/62843df9927b4d8dac5dc7c4a189567fa52ab2bb.1599717402.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/hisi_hikey_usb.c')
-rw-r--r--drivers/misc/hisi_hikey_usb.c99
1 files changed, 84 insertions, 15 deletions
diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c
index 3a98a890757c..2ddd4072788d 100644
--- a/drivers/misc/hisi_hikey_usb.c
+++ b/drivers/misc/hisi_hikey_usb.c
@@ -14,8 +14,10 @@
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/notifier.h>
+#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/property.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/usb/role.h>
@@ -29,9 +31,13 @@
#define TYPEC_VBUS_POWER_OFF 0
struct hisi_hikey_usb {
+ struct device *dev;
struct gpio_desc *otg_switch;
struct gpio_desc *typec_vbus;
struct gpio_desc *hub_vbus;
+ struct gpio_desc *reset;
+
+ struct regulator *regulator;
struct usb_role_switch *hub_role_sw;
@@ -46,23 +52,47 @@ struct hisi_hikey_usb {
static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
{
- gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
+ int ret, status;
+
+ if (hisi_hikey_usb->hub_vbus)
+ gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
+
+ if (!hisi_hikey_usb->regulator)
+ return;
+
+ status = regulator_is_enabled(hisi_hikey_usb->regulator);
+ if (status == !!value)
+ return;
+
+ if (value)
+ ret = regulator_enable(hisi_hikey_usb->regulator);
+ else
+ ret = regulator_disable(hisi_hikey_usb->regulator);
+
+ if (ret)
+ dev_err(hisi_hikey_usb->dev,
+ "Can't switch regulator state to %s\n",
+ value ? "enabled" : "disabled");
}
static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int switch_to)
{
+ if (!hisi_hikey_usb->otg_switch)
+ return;
+
gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
}
static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int value)
{
+ if (!hisi_hikey_usb->typec_vbus)
+ return;
+
gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
}
-
-
static void relay_set_role_switch(struct work_struct *work)
{
struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
@@ -117,31 +147,70 @@ static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role rol
return 0;
}
+static int hisi_hikey_usb_parse_kirin970(struct platform_device *pdev,
+ struct hisi_hikey_usb *hisi_hikey_usb)
+{
+ struct regulator *regulator;
+ int ret;
+
+ regulator = devm_regulator_get(&pdev->dev, "hub-vdd");
+ if (IS_ERR(regulator)) {
+ if (PTR_ERR(regulator) == -EPROBE_DEFER) {
+ dev_info(&pdev->dev,
+ "waiting for hub-vdd-supply to be probed\n");
+ return PTR_ERR(regulator);
+ }
+ dev_err(&pdev->dev,
+ "get hub-vdd-supply failed with error %ld\n",
+ PTR_ERR(regulator));
+ return PTR_ERR(regulator);
+ }
+ hisi_hikey_usb->regulator = regulator;
+
+ hisi_hikey_usb->reset = devm_gpiod_get(&pdev->dev, "hub_reset_en_gpio",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(hisi_hikey_usb->reset))
+ return PTR_ERR(hisi_hikey_usb->reset);
+
+ return ret;
+}
+
static int hisi_hikey_usb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_hikey_usb *hisi_hikey_usb;
struct usb_role_switch_desc hub_role_switch = {NULL};
+ int ret;
hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
if (!hisi_hikey_usb)
return -ENOMEM;
- hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
- GPIOD_OUT_LOW);
- if (IS_ERR(hisi_hikey_usb->typec_vbus))
- return PTR_ERR(hisi_hikey_usb->typec_vbus);
+ hisi_hikey_usb->dev = &pdev->dev;
hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->otg_switch))
return PTR_ERR(hisi_hikey_usb->otg_switch);
- /* hub-vdd33-en is optional */
- hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
- GPIOD_OUT_HIGH);
- if (IS_ERR(hisi_hikey_usb->hub_vbus))
- return PTR_ERR(hisi_hikey_usb->hub_vbus);
+ hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(hisi_hikey_usb->typec_vbus))
+ return PTR_ERR(hisi_hikey_usb->typec_vbus);
+
+ /* Parse Kirin 970-specific OF data */
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "hisilicon,kirin970_hikey_usbhub")) {
+ ret = hisi_hikey_usb_parse_kirin970(pdev, hisi_hikey_usb);
+ if (ret)
+ return ret;
+ } else {
+ /* hub-vdd33-en is optional */
+ hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(hisi_hikey_usb->hub_vbus))
+ return PTR_ERR(hisi_hikey_usb->hub_vbus);
+ }
hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
if (!hisi_hikey_usb->dev_role_sw)
@@ -149,7 +218,6 @@ static int hisi_hikey_usb_probe(struct platform_device *pdev)
if (IS_ERR(hisi_hikey_usb->dev_role_sw))
return PTR_ERR(hisi_hikey_usb->dev_role_sw);
-
INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
mutex_init(&hisi_hikey_usb->lock);
@@ -158,7 +226,7 @@ static int hisi_hikey_usb_probe(struct platform_device *pdev)
hub_role_switch.driver_data = hisi_hikey_usb;
hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
- &hub_role_switch);
+ &hub_role_switch);
if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
@@ -184,7 +252,8 @@ static int hisi_hikey_usb_remove(struct platform_device *pdev)
}
static const struct of_device_id id_table_hisi_hikey_usb[] = {
- {.compatible = "hisilicon,gpio_hubv1"},
+ { .compatible = "hisilicon,gpio_hubv1" },
+ { .compatible = "hisilicon,kirin970_hikey_usbhub" },
{}
};
MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);