On Sunday, April 20, 2014 8:49 PM, Rahul Sharma wrote:
>
> From: Rahul Sharma <Rahul.Sharma@xxxxxxxxxxx>
>
> Display controller HPD Gpio line is board specific. This patch
> is moving the pinctrl for hpd gpio line to the respective board
> file.
>
> Signed-off-by: Rahul Sharma <Rahul.Sharma@xxxxxxxxxxx>
> ---
> arch/arm/boot/dts/exynos5420-pinctrl.dtsi | 7 -------
> arch/arm/boot/dts/exynos5420-smdk5420.dts | 7 +++++++
> 2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> index e62c8eb..5848c42 100644
> --- a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> +++ b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> @@ -59,13 +59,6 @@
> interrupt-controller;
> #interrupt-cells = <2>;
> };
> -
> - dp_hpd: dp_hpd {
> - samsung,pins = "gpx0-7";
> - samsung,pin-function = <3>;
> - samsung,pin-pud = <0>;
> - samsung,pin-drv = <0>;
> - };
> };
(+cc Doug Anderson, Tomasz Figa)
'gpx0-7' pin is assigned for standard HPD pin. This is chip specific.
So, there should be "gpx0-7" part on chip specific dts file such as
'exynos5420-pinctrl.dtsi'.
However, some boards use GPIO as HPD pin, instead of 'gpx0-7' pin.
This is board specific. In my opinion, the following would look
better. In this way, this patch is not necessary.
1. case: Standard HPD pin is used. (smdk5420)
arch/arm/boot/dts/exynos5420-pinctrl.dts
pinctrl@13400000 {
dp_hpd: dp_hpd {
samsung,pins = "gpx0-7";
samsung,pin-function = <3>;
samsung,pin-pud = <0>;
samsung,pin-drv = <0>;
};
arch/arm/boot/dts/exynos5420-smdk5420.dts
dp-controller@145B0000 {
pinctrl-names = "default";
pinctrl-0 = <&dp_hpd>;
...
2. case: non-standard HPD pin such as GPIO is used. (peach pit)
arch/arm/boot/dts/exynos5420-peach-pit.dts
pinctrl@13400000 {
dp_hpd: dp_hpd {
samsung,pins = "gpx2-6";
samsung,pin-function = <0>;
samsung,pin-pud = <3>;
samsung,pin-drv = <0>;
};
dp-controller@145B0000 {
pinctrl-names = "default";
pinctrl-0 = <&dp_hpd>;
...
samsung,hpd-gpio = <&gpx2 6 0>;
Even though, there is 'dp_hpd' in exynos5420-pinctrl.dts,
'smdk5420' and 'peach pit' can use "gpx0-7" and "gpx2-6",
respectively.
A year ago, Doug Anderson and me agreed that standard HPD pin
part should be included to 'exynos5250-pinctrl.dtsi'.
(https://lkml.org/lkml/2013/5/11/134)
Best regards,
Jingoo Han
>
> pinctrl@13410000 {
> diff --git a/arch/arm/boot/dts/exynos5420-smdk5420.dts b/arch/arm/boot/dts/exynos5420-smdk5420.dts
> index 6910485..62d38c8 100644
> --- a/arch/arm/boot/dts/exynos5420-smdk5420.dts
> +++ b/arch/arm/boot/dts/exynos5420-smdk5420.dts
> @@ -138,6 +138,13 @@
> samsung,pin-pud = <1>;
> samsung,pin-drv = <0>;
> };
> +
> + dp_hpd: dp_hpd {
> + samsung,pins = "gpx0-7";
> + samsung,pin-function = <3>;
> + samsung,pin-pud = <0>;
> + samsung,pin-drv = <0>;
> + };
> };
>
> hdmi@14530000 {
> --
> 1.7.9.5
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