linux-kernel - Re: [PATCH] media: tc358746: select CONFIG_GENERIC

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Date:   Fri, 23 Jun 2023 17:41:02 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Gerald Loacker <gerald.loacker@...fvision.net>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Mikhail Rudenko <mike.rudenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vincent Shih <vincent.sunplus@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH] media: tc358746: select CONFIG_GENERIC_PHY

Hi Arnd,

thanks for the patch.

On 23-06-23, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The tc358746 driver selects CONFIG_GENERIC_PHY_MIPI_DPHY and links to
> that, but this fails when CONFIG_GENERIC_PHY is disabled, because Kbuild
> then never enters the drivers/phy directory for building object files:
> 
> ERROR: modpost: "phy_mipi_dphy_get_default_config_for_hsclk" [drivers/media/i2c/tc358746.ko] undefined!
> 
> Add an explicit 'select GENERIC_PHY' here to ensure that the directory
> is entered, and add another dependency on that symbol so make it
> more obvious what is going on if another driver has the same problem,
> as this will produce a Kconfig warning.
> 
> Fixes: 80a21da360516 ("media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Marco Felsch <m.felsch@...gutronix.de>

> ---
>  drivers/media/i2c/Kconfig | 1 +
>  drivers/phy/Kconfig       | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index cf675ac4b1326..226454b6a90dd 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -1305,6 +1305,7 @@ config VIDEO_TC358746
>  	select VIDEO_V4L2_SUBDEV_API
>  	select MEDIA_CONTROLLER
>  	select V4L2_FWNODE
> +	select GENERIC_PHY
>  	select GENERIC_PHY_MIPI_DPHY
>  	select REGMAP_I2C
>  	help
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index f46e3148d286d..8dba9596408f2 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -18,6 +18,7 @@ config GENERIC_PHY
>  
>  config GENERIC_PHY_MIPI_DPHY
>  	bool
> +	depends on GENERIC_PHY
>  	help
>  	  Generic MIPI D-PHY support.
>  
> -- 
> 2.39.2
> 
>