Hello Vikas,
On 14 July 2014 12:03, Vikas Sajjan <vikas.sajjan@xxxxxxxxxxx> wrote:
> From: Doug Anderson <dianders@xxxxxxxxxxxx>
>
> The mask-tpm-reset GPIO is used by the kernel to prevent the TPM from
> being reset across sleep/wake. If we don't set it to anything then
> the TPM will be reset. U-Boot will detect this as invalid
> and will reset the system on resume time. This GPIO can always be low
> and not hurt anything. It will get pulled back high again during a
> normal warm reset when it will default back to an input.
>
> To properly preserve the TPM state across suspend/resume and to make
> the chrome U-Boot happy, properly set the GPIO to mask the
> reset to the TPM.
>
> Signed-off-by: Doug Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Vikas Sajjan <vikas.sajjan@xxxxxxxxxxx>
After merging Linus Walleij's for-next branch of pinctrl git.
S2R on Exynos5420 based Peach PIT works fine.
Tested-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
> ---
> changes since v1:
> - removed fixed regulator and used hogs instead.
>
> arch/arm/boot/dts/exynos5420-peach-pit.dts | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> index 6c7cab0..c036d9e 100644
> --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> @@ -211,6 +211,18 @@
>
>
> &pinctrl_0 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&mask_tpm_reset>;
> +
> + /* We need GPX0_6 to be low at sleep time; just keep it low always */
> + mask_tpm_reset: mask-tpm-reset {
> + samsung,pins = "gpx0-6";
> + samsung,pin-function = <1>;
> + samsung,pin-pud = <0>;
> + samsung,pin-drv = <0>;
> + samsung,pin-val = <0>;
> + };
> +
> max98090_irq: max98090-irq {
> samsung,pins = "gpx0-2";
> samsung,pin-function = <0>;
> --
> 1.7.9.5
>
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--
Shine bright,
(: Nav :)
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