Re: [PATCH v5 05/10] ARM: dts: Move dp_hpd from exynos5250 into smdk5250 and snow

[Andreas FÃrber]

Doug,

Am 01.08.2014 22:33, schrieb Doug Anderson:
> On Thu, Jul 31, 2014 at 9:54 PM, Andreas FÃrber <afaerber@xxxxxxx> wrote:
>> Spring uses a different GPIO, so this is not a generic SoC piece.
>>
>> Suggested-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
>> Signed-off-by: Andreas FÃrber <afaerber@xxxxxxx>
>> ---
>>  v5: New (Tomasz Figa)
>>  Frees dp_hpd for Spring.
>>
>>  arch/arm/boot/dts/exynos5250-pinctrl.dtsi | 7 -------
>>  arch/arm/boot/dts/exynos5250-smdk5250.dts | 9 +++++++++
>>  arch/arm/boot/dts/exynos5250-snow.dts     | 7 +++++++
>>  3 files changed, 16 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
>> index 886cfca044ac..ed0e5230514b 100644
>> --- a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
>> +++ b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
>> @@ -581,13 +581,6 @@
>>                         samsung,pin-pud = <0>;
>>                         samsung,pin-drv = <0>;
>>                 };
>> -
>> -               dp_hpd: dp_hpd {
>> -                       samsung,pins = "gpx0-7";
>> -                       samsung,pin-function = <3>;
>> -                       samsung,pin-pud = <0>;
>> -                       samsung,pin-drv = <0>;
>> -               };
>>         };
>>
>>         pinctrl@13400000 {
>> diff --git a/arch/arm/boot/dts/exynos5250-smdk5250.dts b/arch/arm/boot/dts/exynos5250-smdk5250.dts
>> index aaa055ac0fe3..5d30fe1dcda4 100644
>> --- a/arch/arm/boot/dts/exynos5250-smdk5250.dts
>> +++ b/arch/arm/boot/dts/exynos5250-smdk5250.dts
>> @@ -414,3 +414,12 @@
>>                 };
>>         };
>>  };
>> +
>> +&pinctrl_0 {
>> +       dp_hpd: dp_hpd {
>> +               samsung,pins = "gpx0-7";
>> +               samsung,pin-function = <3>;
>> +               samsung,pin-pud = <0>;
>> +               samsung,pin-drv = <0>;
>> +       };
>> +};
>> diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts
>> index c4b0c73c736d..a9a2f2743794 100644
>> --- a/arch/arm/boot/dts/exynos5250-snow.dts
>> +++ b/arch/arm/boot/dts/exynos5250-snow.dts
>> @@ -547,6 +547,13 @@
>>  };
>>
>>  &pinctrl_0 {
>> +       dp_hpd: dp_hpd {
>> +               samsung,pins = "gpx0-7";
>> +               samsung,pin-function = <3>;
>> +               samsung,pin-pud = <0>;
>> +               samsung,pin-drv = <0>;
>> +       };
>> +
> 
> NAK.  dp_hpd is a generic SoC piece.  Pin function 0 and 1 are GPIOs.
> Pin function 3 is special function.  This pin _is_ the hot plug detect
> pin for display port.  When it's set as special function 3 it goes
> straight into the hot plug logic of the display port controller.
> 
> Spring may have had its reasons to detect hot plug events on a GPIO
> instead of using this pin, but that doesn't make this pin any less the
> "hot plug pin".

Please advise how to handle it then: Should there be two different
pinctrl entries (if so, how should it be named?), or should spring
override the generic entry? As I reported, 3.8 has only one dp-hpd
pinctrl entry, so I dropped the dp-hpd-gpio naming.

Andreas

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