From mboxrd@z Thu Jan 1 00:00:00 1970 From: naveenkrishna.ch@gmail.com (Naveen Krishna Ch) Date: Mon, 14 Jul 2014 18:12:48 +0530 Subject: [PATCH v2] ARM: dts: Add mask-tpm-reset to the device tree In-Reply-To: <1405319602-29892-1-git-send-email-vikas.sajjan@samsung.com> References: <1405319602-29892-1-git-send-email-vikas.sajjan@samsung.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hello Vikas, On 14 July 2014 12:03, Vikas Sajjan wrote: > From: Doug Anderson > > 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 > Signed-off-by: Vikas Sajjan After merging Linus Walleij's for-next branch of pinctrl git. S2R on Exynos5420 based Peach PIT works fine. Tested-by: Naveen Krishna Chatradhi > --- > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Shine bright, (: Nav :)