linux-kernel - Re: [PATCH v2 3/7] i2c: i2c-core-base: Use format macro in i2c_dev_set

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Date:   Mon, 18 Jan 2021 11:41:58 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, devel@...ica.org,
        rjw@...ysocki.net, lenb@...nel.org, andy@...nel.org,
        mika.westerberg@...ux.intel.com, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, wsa@...nel.org, lee.jones@...aro.org,
        hdegoede@...hat.com, mgross@...ux.intel.com,
        robert.moore@...el.com, erik.kaneda@...el.com,
        andriy.shevchenko@...ux.intel.com,
        laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: Re: [PATCH v2 3/7] i2c: i2c-core-base: Use format macro in
 i2c_dev_set_name()

Hi Daniel,

On Mon, Jan 18, 2021 at 12:34:24AM +0000, Daniel Scally wrote:
> Some places in the kernel allow users to map resources to a device
> using device name (for example, gpiod_lookup_table). Currently
> this involves waiting for the i2c_client to have been registered so we
> can use dev_name(&client->dev). We want to add a function to allow users
> to refer to an i2c device by name before it has been instantiated, so
> create a macro for the format that's accessible outside the i2c layer
> and use it in i2c_dev_set_name()
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Daniel Scally <djrscally@...il.com>
> ---
> 	- Used format macro in i2c_dev_set_name() instead of sub func
> 
>  drivers/i2c/i2c-core-base.c | 4 ++--
>  include/linux/i2c.h         | 3 +++
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 63ebf722a424..547b8926cac8 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -811,12 +811,12 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
>  	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
>  
>  	if (info && info->dev_name) {
> -		dev_set_name(&client->dev, "i2c-%s", info->dev_name);
> +		dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, info->dev_name);
>  		return;
>  	}
>  
>  	if (adev) {
> -		dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev));
> +		dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, acpi_dev_name(adev));

Over 80, please wrap.

With that,

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

>  		return;
>  	}
>  
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 56622658b215..4d40a4b46810 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -39,6 +39,9 @@ enum i2c_slave_event;
>  typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
>  			      enum i2c_slave_event event, u8 *val);
>  
> +/* I2C Device Name Format - to maintain consistency outside the i2c layer */
> +#define I2C_DEV_NAME_FORMAT		"i2c-%s"
> +
>  /* I2C Frequency Modes */
>  #define I2C_MAX_STANDARD_MODE_FREQ	100000
>  #define I2C_MAX_FAST_MODE_FREQ		400000
> -- 
> 2.25.1
> 

-- 
Sakari Ailus