[PATCH 1/5] ARM: dts: move dp hpd line to the board file for exynos5420

[rahul.sharma@samsung.com (Rahul Sharma)]

Thanks Jingoo,

On 8 May 2014 12:02, Jingoo Han <jg1.han@samsung.com> wrote:
> On Sunday, April 20, 2014 8:49 PM, Rahul Sharma wrote:
>>
>> From: Rahul Sharma <Rahul.Sharma@samsung.com>
>>
>> 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@samsung.com>
>> ---
>>  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 at 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 at 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 at 13400000 {
>                 dp_hpd: dp_hpd {
>                         samsung,pins = "gpx2-6";
>                         samsung,pin-function = <0>;
>                         samsung,pin-pud = <3>;
>                         samsung,pin-drv = <0>;
>                 };
>         dp-controller at 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)
>

I wasn't aware of this discussion. It make sense. I will drop this patch.
I need to choose some other name for this pin, say "peach_dp_hpd".
Let me know if any concern.

Regards,
Rahul Sharma.

> Best regards,
> Jingoo Han
>
>>
>>       pinctrl at 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 at 14530000 {
>> --
>> 1.7.9.5
>