[PATCH] ARM: tegra: Enable TPM on tegra124 nyan boards

[Tomeu Vizoso]

On 13 May 2015 at 16:45, Stephen Warren <swarren at wwwdotorg.org> wrote:
> On 05/13/2015 08:13 AM, Simon Glass wrote:
>>
>> Regenerate the pinmux from the latest tegra-pinmux-scripts.
>
>
> (Dropping most CCs; DT maintainers and lists generally don't get CC'd on
> simple DT content changes but rather on schema adds/changes and perhaps
> major DT content changes depending on context)
>
>> diff --git a/arch/arm/boot/dts/tegra124-nyan-big.dts
>> b/arch/arm/boot/dts/tegra124-nyan-big.dts
>
>
>>                 pinctrl-names = "default";
>>                 pinctrl-0 = <&pinmux_default>;
>>
>> -               pinmux_default: common {
>> +               state_default: pinmux {
>
>
> This change will break compilation, since it changes the label name, yet the
> old name is still referenced in pinctrl-0 above. Same applies in the other
> file too.
>
>> diff --git a/arch/arm/boot/dts/tegra124-nyan-blaze.dts
>> b/arch/arm/boot/dts/tegra124-nyan-blaze.dts
>
>
>> @@ -437,18 +437,18 @@
>>                         usb_vbus_en0_pn4 {
>>                                 nvidia,pins = "usb_vbus_en0_pn4";
>>                                 nvidia,function = "usb";
>> -                               nvidia,pull = <TEGRA_PIN_PULL_UP>;
>> +                               nvidia,pull = <TEGRA_PIN_PULL_NONE>;
>>                                 nvidia,tristate = <TEGRA_PIN_DISABLE>;
>>                                 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
>> -                               nvidia,open-drain = <TEGRA_PIN_DISABLE>;
>> +                               nvidia,open-drain = <TEGRA_PIN_ENABLE>;
>>                         };
>>                         usb_vbus_en1_pn5 {
>>                                 nvidia,pins = "usb_vbus_en1_pn5";
>>                                 nvidia,function = "usb";
>> -                               nvidia,pull = <TEGRA_PIN_PULL_UP>;
>> +                               nvidia,pull = <TEGRA_PIN_PULL_NONE>;
>>                                 nvidia,tristate = <TEGRA_PIN_DISABLE>;
>>                                 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
>> -                               nvidia,open-drain = <TEGRA_PIN_DISABLE>;
>> +                               nvidia,open-drain = <TEGRA_PIN_ENABLE>;
>>                         };
>
>
> Tomeu, can you comment on those changes? Evidently the pinmux configuration
> that's you added to the kernel doesn't exactly match the pinmux
> configuration that you added to tegra-pinmux-scripts.

Are you sure? Just checked and what tegra-pinmux-scripts currently
generates matches what is currently in the kernel, for both nyans.

> Is the change above
> correct, or do we need to propagate this change from the kernel DT into
> tegra-pinmux-scripts, and hence also into the U-Boot pinmux setup table?
>
> My understanding of how these pins are generally used is that open-drain is
> likely correct. I have no idea whether Tegra should supply the pullup for
> these pins, or whether the board has a pullup resistor in which case Tegra
> doesn't need to pull up.

>From what Andrew (added to CC) said when these changes were discussed,
it shouldn't matter as a fixed regulator is used to drive those pins
high.

Regards,

Tomeu

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