linux-kernel - [PATCH v2] regulator: gpio: Honor regulator-boot-on property

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Message-Id: <20200720100113.6481-1-wens@kernel.org>
Date:   Mon, 20 Jul 2020 18:01:13 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v2] regulator: gpio: Honor regulator-boot-on property

From: Chen-Yu Tsai <wens@...e.org>

When requesting the enable GPIO, the driver should do so with the
correct output level matching some expected state. This is especially
important if the regulator is a critical one, such as a supply for
the boot CPU. This is currently done by checking for the enable-at-boot
property, but this is not documented in the device tree binding, nor
does it match the common regulator properties.

Honor the common regulator-boot-on property by checking the boot_on
constraint setting within the DT probe path. This is the same as what
is done in the fixed regulator driver.

Also drop support for the undocumented enable-at-boot property. This
property was not documented in the original commit introducing DT
support, nor is it now, and there are no in-tree device trees that use
this property.

Fixes: 006694d099e8 ("regulator: gpio-regulator: Allow use of GPIO controlled regulators though DT")
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/regulator/gpio-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 110ee6fe76c4..5646b7a26288 100644
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -148,7 +148,7 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np,

 	config->supply_name = config->init_data->constraints.name;

-	if (of_property_read_bool(np, "enable-at-boot"))
+	if (config->init_data->constraints.boot_on)
 		config->enabled_at_boot = true;

 	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
-- 
2.27.0