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

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

[Chen-Yu Tsai]

From: Chen-Yu Tsai <wens@csie.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@csie.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

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

[Mark Brown]

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On Mon, Jul 20, 2020 at 06:01:13PM +0800, Chen-Yu Tsai wrote:

> 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.

There may still be out of tree users, an ABI is an ABI.

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

[Chen-Yu Tsai]

On Mon, Jul 20, 2020 at 7:06 PM Mark Brown <broonie@kernel.org> wrote:
>
> On Mon, Jul 20, 2020 at 06:01:13PM +0800, Chen-Yu Tsai wrote:
>
> > 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.
>
> There may still be out of tree users, an ABI is an ABI.

Ok. Should I add a comment stating this should not be used in new files?
Or just leave it as it?

ChenYu

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

[Mark Brown]

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On Mon, Jul 20, 2020 at 08:03:06PM +0800, Chen-Yu Tsai wrote:
> On Mon, Jul 20, 2020 at 7:06 PM Mark Brown <broonie@kernel.org> wrote:

> > There may still be out of tree users, an ABI is an ABI.

> Ok. Should I add a comment stating this should not be used in new files?
> Or just leave it as it?

A comment would be fine.

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