On Mon, Aug 08, 2016 at 05:00:41PM +0200, Andreas Färber wrote:
> Am 08.08.2016 um 16:12 schrieb Shawn Guo:
> > On Tue, Jul 05, 2016 at 06:04:10AM +0200, Andreas Färber wrote:
> >> Enable the SDHC node and model the SDIO_PWR GPIO as a regulator.
> >> Use the SD card as default trigger for the red LED.
> >>
> >> Cc: Ettore Chimenti <ettore.chimenti@xxxxxxxx>
> >> Signed-off-by: Andreas Färber <afaerber@xxxxxxx>
> >> ---
> >>
> >>
> >> arch/arm/boot/dts/imx6sx-udoo-neo.dtsi | 34 ++++++++++++++++++++++++++++++++++
> >> 1 file changed, 34 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi b/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> >> index e074409644d8..85f5e8606dab 100644
> >> --- a/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> >> +++ b/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> >> @@ -56,6 +56,7 @@
> >> label = "udoo-neo:red:mmc";
> >> gpios = <&gpio6 0 GPIO_ACTIVE_HIGH>;
> >> default-state = "off";
> >> + linux,default-trigger = "mmc0";
> >> };
> >>
> >> orange {
> >> @@ -64,6 +65,17 @@
> >> default-state = "keep";
> >> };
> >> };
> >> +
> >> + sdio_pwr_reg: sd-gpio-regulator {
> >> + compatible = "regulator-fixed";
> >> + gpio = <&gpio6 1 GPIO_ACTIVE_HIGH>;
> >> + enable-active-high;
> >> + regulator-name = "SDIO_PWR";
> >> + regulator-min-microvolt = <3300000>;
> >> + regulator-max-microvolt = <3300000>;
> >> + regulator-boot-on;
> >> + regulator-always-on;
> >> + };
> >
> > Is it correct to model SDIO power control GPIO as a boot-on and
> > always-on fixed regulator? It will be powered-on even when SDIO driver
> > is not enabled or loaded.
>
> AFAIR the issue was that the driver does not use any -supply properties
> where we could hook this regulator up for enabling. So modeling it as an
> always-on regulator seemed like the only way to ensure it gets enabled
> without relying on the bootloader?
If I understand it correctly, SDHCI driver calls
mmc_regulator_get_supply() to handle vmmc and vqmmc supply. Can
vmmc-supply be used here?
Shawn
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