linux-kernel - [PATCH 2/2] mfd: cros_ec_dev: Add gpio device if feature present on EC

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Date: Mon, 19 Feb 2024 12:23:24 -0800
From: Stephen Boyd <swboyd@...omium.org>
To: Lee Jones <lee@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	devicetree@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>
Subject: [PATCH 2/2] mfd: cros_ec_dev: Add gpio device if feature present on EC

The ChromeOS embedded controller (EC) supports setting the state of
GPIOs when the system is unlocked, and getting the state of GPIOs in all
cases. Check for the feature support by checking for the GPIO feature
and then populate a sub-device for the gpio hardware on the EC.

Cc: Lee Jones <lee@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Benson Leung <bleung@...omium.org>
Cc: Guenter Roeck <groeck@...omium.org>
Cc: <chrome-platform@...ts.linux.dev>
Cc: Pin-yen Lin <treapking@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/mfd/cros_ec_dev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 603b1cd52785..9c3f8488b416 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -74,6 +74,10 @@ static const struct mfd_cell cros_ec_cec_cells[] = {
 	{ .name = "cros-ec-cec", },
 };
 
+static const struct mfd_cell cros_ec_gpio_cells[] = {
+	{ .name = "cros-ec-gpio", },
+};
+
 static const struct mfd_cell cros_ec_rtc_cells[] = {
 	{ .name = "cros-ec-rtc", },
 };
@@ -97,6 +101,11 @@ static const struct cros_feature_to_cells cros_subdevices[] = {
 		.mfd_cells	= cros_ec_cec_cells,
 		.num_cells	= ARRAY_SIZE(cros_ec_cec_cells),
 	},
+	{
+		.id		= EC_FEATURE_GPIO,
+		.mfd_cells	= cros_ec_gpio_cells,
+		.num_cells	= ARRAY_SIZE(cros_ec_gpio_cells),
+	},
 	{
 		.id		= EC_FEATURE_RTC,
 		.mfd_cells	= cros_ec_rtc_cells,
-- 
https://chromeos.dev