linux-kernel - Re: [PATCH v2 2/6] iio: light: stk3310: Implement vdd supply and power it off during suspend

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Message-ID: <CAHp75VeRDSPvpmSbUyZPp0RMoTOE193U2ma18qxv_qZQKLCq8g@mail.gmail.com>
Date: Wed, 24 Apr 2024 02:16:06 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Aren Moynihan <aren@...cevolution.org>
Cc: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Liam Girdwood <lgirdwood@...il.com>, 
	Mark Brown <broonie@...nel.org>, Ondrej Jirman <megi@....cz>, 
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
	linux-iio@...r.kernel.org, phone-devel@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
	Willow Barraco <contact@...lowbarraco.fr>
Subject: Re: [PATCH v2 2/6] iio: light: stk3310: Implement vdd supply and
 power it off during suspend

On Wed, Apr 24, 2024 at 1:41 AM Aren Moynihan <aren@...cevolution.org> wrote:
>
> From: Ondrej Jirman <megi@....cz>
>
> VDD power input can be used to completely power off the chip during
> system suspend. Do so if available.

..

>         ret = stk3310_init(indio_dev);
>         if (ret < 0)
> -               return ret;
> +               goto err_vdd_disable;

This is wrong. You will have the regulator being disabled _before_
IRQ. Note, that the original code likely has a bug which sets states
before disabling IRQ and removing a handler.

Side note, you may make the driver neater with help of

  struct device *dev = &client->dev;

defined in this patch.

..

>  static int stk3310_suspend(struct device *dev)
>  {
>         struct stk3310_data *data;

>         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

Side note: This may be updated (in a separate change) to use
dev_get_drvdata() directly.

Jonathan, do we have something like iio_priv_from_drvdata(struct
device *dev)? Seems many drivers may utilise it.

>  }

..

>  static int stk3310_resume(struct device *dev)

Ditto.

--
With Best Regards,
Andy Shevchenko