On 10/23/2012 12:07 PM, Marc Dietrich wrote:
> Pavan,
>
> On Tuesday 23 October 2012 12:48:59 Pavan Kunapuli wrote:
>> Adding vmmc and vmmcq supplies for sdhci nodes
>> in tegra dt files.
>
> <...>
>
>> diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
>> b/arch/arm/boot/dts/tegra20-paz00.dts index 6a93d14..e161b65 100644
>> --- a/arch/arm/boot/dts/tegra20-paz00.dts
>> +++ b/arch/arm/boot/dts/tegra20-paz00.dts
>> @@ -422,13 +422,17 @@
>> status = "okay";
>> cd-gpios = <&gpio 173 0>; /* gpio PV5 */
>> wp-gpios = <&gpio 57 0>; /* gpio PH1 */
>> - power-gpios = <&gpio 169 0>; /* gpio PV1 */
>> bus-width = <4>;
>> + vmmc-supply = <&vddio_sd_reg>;
>> + vqmmc-supply = <&vddio_sd_reg>;
>> };
>>
>> sdhci@c8000600 {
>> status = "okay";
>> bus-width = <8>;
>> + vmmc-supply = <&vddio_sdmmc_reg>;
>> + vqmmc-supply = <&vddio_sdmmc_reg>;
>
> to make it better, this should be:
>
> vmmc-supply = <&vcore_mmc_reg>; and
> vqmmc-supply = <&vddio_nand_reg>;
>
> with vcore_mmc_reg is ldo5 and vddio_nand_reg is the fixed regulator below.
I think for the eMMC (not SD card), the core supply is actually +3vs_s3,
and hence fixed; it looks like LDO5 used to be used, but they changed
it. See the note for the VCC connections on the eMMC chip.
> By doing so, I get "sdhci-tegra sdhci-tegra.3: could not set regulator OCR
> (-1)". MMC subsys wants to set ldo5 to 3.3V but it is fixed. I guess that's
> harmless for now.
What I mention above might end up fixing that?
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