From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed
Date: Thu, 19 May 2016 10:12:35 -0600 [thread overview]
Message-ID: <573DE5F3.2060406@wwwdotorg.org> (raw)
In-Reply-To: <573DCE43.70906@nvidia.com>
On 05/19/2016 08:31 AM, Jon Hunter wrote:
>
> On 29/02/16 21:01, Lucas Stach wrote:
>> This allows to switch the card signal voltage level to 1.8V,
>> which is needed for any ultra high speed modes to work.
>>
>> Signed-off-by: Lucas Stach <dev@lynxeye•de>
>> ---
>> This needs the SDMMC memcomp pad calibration patches I just
>> sent out to be applied, otherwise the card voltage change will
>> fail with a message in the kernel log and a fall back to
>> high speed operation.
>> ---
>> arch/arm/boot/dts/tegra30-beaver.dts | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/tegra30-beaver.dts b/arch/arm/boot/dts/tegra30-beaver.dts
>> index 1daed40..6b237f2 100644
>> --- a/arch/arm/boot/dts/tegra30-beaver.dts
>> +++ b/arch/arm/boot/dts/tegra30-beaver.dts
>> @@ -1848,7 +1848,7 @@
>>
>> ldo5_reg: ldo5 {
>> regulator-name = "vddio_sdmmc,avdd_vdac";
>
> Stephen, looking at the schematics, I don't see that this is connected
> to the avdd_vdac (which appears to be unconnected) and so I am wondering
> if this name should be just "vddio_sdmmc"?
Yes, I don't know where avdd_vdac came from; it doesn't appear connected
on any Beaver (or even Cardhu, from which it was probably derived)
schematic that I have.
CC += Bryan in case he has any recollection since he wrote this DT.
prev parent reply other threads:[~2016-05-19 16:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 21:01 [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed Lucas Stach
2016-05-13 7:25 ` Lucas Stach
2016-05-13 17:27 ` Thierry Reding
2016-05-13 19:08 ` Lucas Stach
2016-05-19 14:29 ` Jon Hunter
2016-06-13 10:22 ` Jon Hunter
2016-06-14 6:20 ` Adrian Hunter
2016-06-14 8:23 ` Jon Hunter
2016-06-14 10:05 ` Adrian Hunter
2016-06-14 14:19 ` Jon Hunter
2016-06-24 9:14 ` Jon Hunter
2016-06-28 13:27 ` Adrian Hunter
2016-05-19 14:31 ` Jon Hunter
2016-05-19 16:12 ` Stephen Warren [this message]
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