Re: [PATCH] usb: typec: nb7vpq904m: fix CONFIG_DRM dependency

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Thu, Jun 22, 2023 at 06:16:26PM +0200, Neil Armstrong wrote:
> With the following config set:
> CONFIG_DRM=m
> CONFIG_DRM_PANEL=y
> CONFIG_DRM_BRIDGE=y
> CONFIG_DRM_PANEL_BRIDGE=y
> CONFIG_TYPEC_MUX_NB7VPQ904M=y
> 
> vmlinux fails on the following symbols:
>   ld.lld: error: undefined symbol: devm_drm_bridge_add
>   ld.lld: error: undefined symbol: devm_drm_of_get_bridge
> 
> Add dependendy on DRM || DRM=no since CONFIG_DRM dependency is optional
> and guarded by:
> IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE)
> in the drive.
> 
> Also add "select DRM_PANEL_BRIDGE if DRM" to clarify DRM_PANEL_BRIDGE
> is required if CONFIG_DRM is enabled.
> 
> Fixes: 88d8f3ac9c67 ("usb: typec: add support for the nb7vpq904m Type-C Linear Redriver")
> Reported-by: Arnd Bergmann <arnd@kernel.org>
> Suggested-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> This is re-spin of [1]
> 
> [1] https://lore.kernel.org/all/20230622101813.3453772-1-arnd@kernel.org/
> ---
>  drivers/usb/typec/mux/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
> index 8c4d6b8fb75c..784b9d8107e9 100644
> --- a/drivers/usb/typec/mux/Kconfig
> +++ b/drivers/usb/typec/mux/Kconfig
> @@ -38,6 +38,8 @@ config TYPEC_MUX_INTEL_PMC
>  config TYPEC_MUX_NB7VPQ904M
>  	tristate "On Semiconductor NB7VPQ904M Type-C redriver driver"
>  	depends on I2C
> +	depends on DRM || DRM=n
> +	select DRM_PANEL_BRIDGE if DRM
>  	select REGMAP_I2C
>  	help
>  	  Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C
> 
> ---
> base-commit: c87d46a9e8ebd2f2c3960927b1d21687096d1109
> change-id: 20230622-topic-sm8x50-upstream-redriver-config-fix-8f0aef3e2129
> 
> Best regards,
> -- 
> Neil Armstrong <neil.armstrong@linaro.org>

-- 
heikki