| Message ID | 1381423481-5920-1-git-send-email-nm@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
* Nishanth Menon <nm@ti.com> [131010 09:53]: > Do not reset GPIO1 at boot-up because GPIO 7 in GPIO1 block is used on > OMAP4460 PandaBoard-ES to select voltage register in TPS62361 which > supplies VDD_MPU. > > Without this, OMAP4460 PandaBoard-ES boards fail to boot-up because > MPU voltage switches over to VSET0 voltage value (boot voltage) which > is not sufficient to operate the device at OPP100. Is this needs as a fix for the -rc series? Tony > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > As explained here: http://marc.info/?l=u-boot&m=133066647800872&w=2 > > GPIO1 reset causes PandaBoard-ES to stop functioning. > This depends on Patch series from Rajendra: > http://marc.info/?l=linux-doc&m=138131355520116&w=2 > Applies on Benoit's for_13/dts branch: > https://git.kernel.org/cgit/linux/kernel/git/bcousson/linux-omap-dt.git/log/?h=for_3.13/dts > > Tested on PandaBoard-ES without the u-boot uenv hack > > arch/arm/boot/dts/omap4-panda-es.dts | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/boot/dts/omap4-panda-es.dts b/arch/arm/boot/dts/omap4-panda-es.dts > index 56c4354..816d1c9 100644 > --- a/arch/arm/boot/dts/omap4-panda-es.dts > +++ b/arch/arm/boot/dts/omap4-panda-es.dts > @@ -62,3 +62,7 @@ > gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>; > }; > }; > + > +&gpio1 { > + ti,no-reset-on-init; > +}; > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 10/10/2013 11:47 AM, Tony Lindgren wrote: > * Nishanth Menon <nm@ti.com> [131010 09:53]: >> Do not reset GPIO1 at boot-up because GPIO 7 in GPIO1 block is used on >> OMAP4460 PandaBoard-ES to select voltage register in TPS62361 which >> supplies VDD_MPU. >> >> Without this, OMAP4460 PandaBoard-ES boards fail to boot-up because >> MPU voltage switches over to VSET0 voltage value (boot voltage) which >> is not sufficient to operate the device at OPP100. > > Is this needs as a fix for the -rc series? Nope, this is not a regression recently introduced, has been in since day one of Panda-ES support. Further, we still have decision pending on the dependent series from Rajendra[1] - will be good to see it go in along with AM335x-EVM. [1] http://marc.info/?t=138131368300005&r=1&w=2
Hi Nishanth, On 10/10/2013 18:44, Nishanth Menon wrote: > Do not reset GPIO1 at boot-up because GPIO 7 in GPIO1 block is used on > OMAP4460 PandaBoard-ES to select voltage register in TPS62361 which > supplies VDD_MPU. > > Without this, OMAP4460 PandaBoard-ES boards fail to boot-up because > MPU voltage switches over to VSET0 voltage value (boot voltage) which > is not sufficient to operate the device at OPP100. > > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > As explained here: http://marc.info/?l=u-boot&m=133066647800872&w=2 > > GPIO1 reset causes PandaBoard-ES to stop functioning. > This depends on Patch series from Rajendra: > http://marc.info/?l=linux-doc&m=138131355520116&w=2 > Applies on Benoit's for_13/dts branch: > https://git.kernel.org/cgit/linux/kernel/git/bcousson/linux-omap-dt.git/log/?h=for_3.13/dts I've just applied it after Rajendra's series. Thanks, Benoit > > Tested on PandaBoard-ES without the u-boot uenv hack > > arch/arm/boot/dts/omap4-panda-es.dts | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/boot/dts/omap4-panda-es.dts b/arch/arm/boot/dts/omap4-panda-es.dts > index 56c4354..816d1c9 100644 > --- a/arch/arm/boot/dts/omap4-panda-es.dts > +++ b/arch/arm/boot/dts/omap4-panda-es.dts > @@ -62,3 +62,7 @@ > gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>; > }; > }; > + > +&gpio1 { > + ti,no-reset-on-init; > +}; >
diff --git a/arch/arm/boot/dts/omap4-panda-es.dts b/arch/arm/boot/dts/omap4-panda-es.dts index 56c4354..816d1c9 100644 --- a/arch/arm/boot/dts/omap4-panda-es.dts +++ b/arch/arm/boot/dts/omap4-panda-es.dts @@ -62,3 +62,7 @@ gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>; }; }; + +&gpio1 { + ti,no-reset-on-init; +};
Do not reset GPIO1 at boot-up because GPIO 7 in GPIO1 block is used on OMAP4460 PandaBoard-ES to select voltage register in TPS62361 which supplies VDD_MPU. Without this, OMAP4460 PandaBoard-ES boards fail to boot-up because MPU voltage switches over to VSET0 voltage value (boot voltage) which is not sufficient to operate the device at OPP100. Signed-off-by: Nishanth Menon <nm@ti.com> --- As explained here: http://marc.info/?l=u-boot&m=133066647800872&w=2 GPIO1 reset causes PandaBoard-ES to stop functioning. This depends on Patch series from Rajendra: http://marc.info/?l=linux-doc&m=138131355520116&w=2 Applies on Benoit's for_13/dts branch: https://git.kernel.org/cgit/linux/kernel/git/bcousson/linux-omap-dt.git/log/?h=for_3.13/dts Tested on PandaBoard-ES without the u-boot uenv hack arch/arm/boot/dts/omap4-panda-es.dts | 4 ++++ 1 file changed, 4 insertions(+)