[PATCH v3 1/2] ARM: dts: Add mask-tpm-reset to the device tree

Doug Anderson dianders at chromium.org
Tue Jul 15 09:19:12 PDT 2014


On Tue, Jul 15, 2014 at 3:31 AM, Vikas Sajjan <vikas.sajjan at samsung.com> wrote:
> From: Doug Anderson <dianders at chromium.org>
> 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 at chromium.org>
> Signed-off-by: Vikas Sajjan <vikas.sajjan at samsung.com>
> ---
>  arch/arm/boot/dts/exynos5420-peach-pit.dts |   12 ++++++++++++
>  1 file changed, 12 insertions(+)

Looks good to me.  I'll assume Kukjin will add the words
"exynos5420-peach-pit" into the patch description when applying.

Reviewed-by: Doug Anderson <dianders at chromium.org>


More information about the linux-arm-kernel mailing list