On Thu, 9 Aug 2018 14:15:00 +0200
Thierry Reding <thierry.reding@xxxxxxxxx> wrote:
> On Wed, Aug 01, 2018 at 07:31:52PM +0300, Aapo Vienamo wrote:
> > Document the pinctrl bindings used by the SDHCI driver to reconfigure
> > pad voltages on controllers supporting multiple voltage levels.
> >
> > Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
> > Reviewed-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
> > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
> > ---
> > .../bindings/mmc/nvidia,tegra20-sdhci.txt | 22 ++++++++++++++++++++++
> > 1 file changed, 22 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> > index 9bce578..90c214d 100644
> > --- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> > +++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> > @@ -38,3 +38,25 @@ sdhci@c8000200 {
> > power-gpios = <&gpio 155 0>; /* gpio PT3 */
> > bus-width = <8>;
> > };
> > +
> > +Optional properties for Tegra210 and Tegra186:
> > +- pinctrl-names, pinctrl-0, pinctrl-1 : Specify pad voltage
> > + configurations. Valid pinctrl-names are "sdmmc-3v3" and "sdmmc-1v8"
> > + for controllers supporting multiple voltage levels. The order of names
> > + should correspond to the pin configuration states in pinctrl-0 and
> > + pinctrl-1.
>
> Do we also want "sdmmc-off" to allow SDMMC pads to be powered down when
> the slot or card is not used?
I don't see a real need for it, at least not in the context of this
series which aims to implement support for HS200 and UHS signaling. I
guess it could be added later if there's an actual case for it, where
turning off the pad would result in measureable change in total power
consumption.
-Aapo
> > +
> > +Example:
> > +sdhci@700b0000 {
> > + compatible = "nvidia,tegra210-sdhci", "nvidia,tegra124-sdhci";
> > + reg = <0x0 0x700b0000 0x0 0x200>;
> > + interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&tegra_car TEGRA210_CLK_SDMMC1>;
> > + clock-names = "sdhci";
> > + resets = <&tegra_car 14>;
> > + reset-names = "sdhci";
> > + pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
> > + pinctrl-0 = <&sdmmc1_3v3>;
> > + pinctrl-1 = <&sdmmc1_1v8>;
> > + status = "disabled";
> > +};
> > --
> > 2.7.4
> >
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