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From d26dd7c4ef1a2cb88440420deccc54eb88129c60 Mon Sep 17 00:00:00 2001
From: "Jason M. Bills" <jason.m.bills@linux.intel.com>
Date: Mon, 6 May 2019 14:18:27 -0700
Subject: [PATCH] Enable GPIOE0 and GPIOE2 pass-through by default
This change sets the gpio DT pinctrl default configuration to
enable GPIOE0 and GPIOE2 pass-through. Since this causes
pinctrl_get_select_default() to be called automatically for
the gpio driver to claim the GPIO pins in those groups, we
also need to call pinctrl_put() to release claim on the
pass-through GPIOs so they can be requested at runtime.
Tested:
Disabled pass-through in uboot and confirmed that after booting
Linux, pass-through is enabled and 'cat /sys/kernel/debug/pinctrl/
1e6e2000.syscon\:pinctrl-aspeed-g5-pinctrl/pinmux-pins' shows that
the pass-through GPIOs are UNCLAIMED.
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
---
arch/arm/boot/dts/aspeed-bmc-intel-purley.dts | 4 ++++
drivers/gpio/gpio-aspeed.c | 10 ++++++++++
2 files changed, 14 insertions(+)
diff --git a/arch/arm/boot/dts/aspeed-bmc-intel-purley.dts b/arch/arm/boot/dts/aspeed-bmc-intel-purley.dts
index 45556ac..051e927 100644
--- a/arch/arm/boot/dts/aspeed-bmc-intel-purley.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-intel-purley.dts
@@ -124,6 +124,10 @@
&gpio {
status = "okay";
+ /* Enable GPIOE0 and GPIOE2 pass-through by default */
+ pinctrl-names = "pass-through";
+ pinctrl-0 = <&pinctrl_gpie0_default
+ &pinctrl_gpie2_default>;
gpio-line-names =
/*A0-A8*/ "","","","","","","","",
/*B0-B8*/ "","","","","","","","",
diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index 2175070..f47d139 100644
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -1157,6 +1157,7 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
const struct of_device_id *gpio_id;
struct aspeed_gpio *gpio;
struct resource *res;
+ struct pinctrl *pinctrl;
int rc, i, banks;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
@@ -1205,6 +1206,15 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
return -ENOMEM;
/*
+ * Select the pass-through pinctrl config to enable the pass-through
+ * mux for GPIOs E0 and E2. Then call pinctrl_put() to release claim
+ * of the GPIO pins, so they can be requested at runtime.
+ */
+ pinctrl = pinctrl_get_select(&pdev->dev, "pass-through");
+ if (pinctrl)
+ pinctrl_put(pinctrl);
+
+ /*
* Populate it with initial values read from the HW and switch
* all command sources to the ARM by default
*/
--
2.7.4
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