linux-kernel - Re: [PATCH RFC 1/5] drm/msm/hdmi: deprecate non standard gpio properties.

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Date:	Mon, 10 Aug 2015 14:45:12 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	dri-devel@...ts.freedesktop.org, robdclark@...il.com,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 1/5] drm/msm/hdmi: deprecate non standard gpio
 properties.

On Mon, Aug 10, 2015 at 12:59:22PM +0100, Srinivas Kandagatla wrote:
> This patch updates the bindings to discourage the usage of non standard
> gpio properites, this will help in projects focused on upstreaming.

That last part is an odd comment to make in the commit message of a
patch submitted upstream...

> These deprecated properties are still supported but will be remove over
> the time.

You can't ever remove them because you can't ever be sure that people
won't be using an old DTB.

> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  Documentation/devicetree/bindings/drm/msm/hdmi.txt | 22 +++++++++++++++++-----
>  1 file changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/drm/msm/hdmi.txt b/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> index c43aa53..acba581 100644
> --- a/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> +++ b/Documentation/devicetree/bindings/drm/msm/hdmi.txt
> @@ -11,15 +11,27 @@ Required properties:
>  - interrupts: The interrupt signal from the hdmi block.
>  - clocks: device clocks
>    See ../clocks/clock-bindings.txt for details.
> -- qcom,hdmi-tx-ddc-clk-gpio: ddc clk pin
> -- qcom,hdmi-tx-ddc-data-gpio: ddc data pin
> -- qcom,hdmi-tx-hpd-gpio: hpd pin
> +- qcom,hdmi-tx-ddc-clk-gpios: ddc clk pin
> +- qcom,hdmi-tx-ddc-data-gpios: ddc data pin
> +- qcom,hdmi-tx-hpd-gpios: hpd pin
>  - core-vdda-supply: phandle to supply regulator
>  - hdmi-mux-supply: phandle to mux regulator
>  
> +- qcom,hdmi-tx-ddc-clk-gpio: (deprecated) use
> +	"qcom,hdmi-tx-ddc-clk-gpios" instead
> +- qcom,hdmi-tx-ddc-data-gpio: (deprecated) use
> +	"qcom,hdmi-tx-ddc-data-gpios" instead
> +- qcom,hdmi-tx-hpd-gpio: (deprecated) use
> +	"qcom,hdmi-tx-hpd-gpios" instead
> +
>  Optional properties:
> -- qcom,hdmi-tx-mux-en-gpio: hdmi mux enable pin
> -- qcom,hdmi-tx-mux-sel-gpio: hdmi mux select pin
> +- qcom,hdmi-tx-mux-en-gpios: hdmi mux enable pin
> +- qcom,hdmi-tx-mux-sel-gpios: hdmi mux select pin
> +
> +- qcom,hdmi-tx-mux-en-gpio: (deprecated) use "qcom,hdmi-tx-mux-en-gpios"
> +	instead
> +- qcom,hdmi-tx-mux-sel-gpio: (deprecated) use "qcom,hdmi-tx-mux-sel-gpio"
> +	instead
>  - pinctrl-names: the pin control state names; should contain "default"
>  - pinctrl-0: the default pinctrl state (active)
>  - pinctrl-1: the "sleep" pinctrl state

I don't see much use in listing that these properties are deprecated. We
already have code to catch the deprecated names, so having them in the
binding will at best be distracting.

Anyway, I don't know if there's been any advice on this from the device
tree bindings maintainers, so adding devicetree@...r.kernel.org for
visibility.

Thierry

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