linux-kernel - Re: [PATCH v2 3/3] media: i2c: ak7375: Add regulator management

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Message-ID: <Ytvcmpa3aPkS9NYK@valkosipuli.retiisi.eu>
Date:   Sat, 23 Jul 2022 14:33:46 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Yassine Oudjana <yassine.oudjana@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Yassine Oudjana <y.oudjana@...tonmail.com>,
        Jacopo Mondi <jacopo@...ndi.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] media: i2c: ak7375: Add regulator management

Hi Yassine,

Thanks for the patch.

On Mon, Jul 11, 2022 at 06:40:39PM +0400, Yassine Oudjana wrote:
> From: Yassine Oudjana <y.oudjana@...tonmail.com>
> 
> Make the driver get needed regulators on probe and enable/disable
> them on runtime PM callbacks.
> 
> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
> ---
> Changes since v1:
>   - Reorganize variable declaration
>   - Change the power-on delay range to 3000-3500 microseconds.
> 
>  drivers/media/i2c/ak7375.c | 39 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c
> index 40b1a4aa846c..c2b2542a0056 100644
> --- a/drivers/media/i2c/ak7375.c
> +++ b/drivers/media/i2c/ak7375.c
> @@ -6,6 +6,7 @@
>  #include <linux/i2c.h>
>  #include <linux/module.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-device.h>
>  
> @@ -23,17 +24,32 @@
>   */
>  #define AK7375_CTRL_STEPS	64
>  #define AK7375_CTRL_DELAY_US	1000
> +/*
> + * The vcm takes around 3 ms to power on and start taking
> + * I2C messages. This value was found experimentally due to
> + * lack of documentation.
> + */
> +#define AK7375_POWER_DELAY_US	3000
>  
>  #define AK7375_REG_POSITION	0x0
>  #define AK7375_REG_CONT		0x2
>  #define AK7375_MODE_ACTIVE	0x0
>  #define AK7375_MODE_STANDBY	0x40
>  
> +static const char * const ak7375_supply_names[] = {
> +	"vdd",
> +	"vio",
> +};
> +
> +#define AK7375_NUM_SUPPLIES ARRAY_SIZE(ak7375_supply_names)

Please drop this, and use ARRAY_SIZE() directly.

> +
>  /* ak7375 device structure */
>  struct ak7375_device {
>  	struct v4l2_ctrl_handler ctrls_vcm;
>  	struct v4l2_subdev sd;
>  	struct v4l2_ctrl *focus;
> +	struct regulator_bulk_data supplies[AK7375_NUM_SUPPLIES];
> +
>  	/* active or standby mode */
>  	bool active;
>  };
> @@ -133,12 +149,24 @@ static int ak7375_probe(struct i2c_client *client)
>  {
>  	struct ak7375_device *ak7375_dev;
>  	int ret;
> +	int i;

unsigned int, please.

-- 
Kind regards,

Sakari Ailus