[V4,1/3] dt-bindings: mmc: tegra: Add pinctrl for SDMMC drive strengths
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Message ID 1547160363-25323-1-git-send-email-skomatineni@nvidia.com
State New
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  • [V4,1/3] dt-bindings: mmc: tegra: Add pinctrl for SDMMC drive strengths
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Commit Message

Sowjanya Komatineni Jan. 10, 2019, 10:46 p.m. UTC
Add pinctrls for 3V3 and 1V8 pad drive strength configuration for
Tegra210 sdmmc.

Tegra210 sdmmc has pad configuration registers in pinmux register
domain and handled thru pinctrl to pinmux device node.

Tegra186 and Tegra194 has pad configuration register with in the
SDMMC register domain itself and are handles thru drive strength
properties in sdmmc device node.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Rob Herring Jan. 15, 2019, 8:05 p.m. UTC | #1
On Thu, 10 Jan 2019 14:46:01 -0800, Sowjanya Komatineni wrote:
> Add pinctrls for 3V3 and 1V8 pad drive strength configuration for
> Tegra210 sdmmc.
> 
> Tegra210 sdmmc has pad configuration registers in pinmux register
> domain and handled thru pinctrl to pinmux device node.
> 
> Tegra186 and Tegra194 has pad configuration register with in the
> SDMMC register domain itself and are handles thru drive strength
> properties in sdmmc device node.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 32b4b4e41923..2cecdc71d94c 100644
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -39,12 +39,16 @@  sdhci@c8000200 {
 	bus-width = <8>;
 };
 
-Optional properties for Tegra210 and Tegra186:
+Optional properties for Tegra210, Tegra186 and Tegra194:
 - 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.
+- pinctrl-names : "sdmmc-3v3-drv" and "sdmmc-1v8-drv" are applicable for
+  Tegra210 where pad config registers are in the pinmux register domain
+  for pull-up-strength and pull-down-strength values configuration when
+  using pads at 3V3 and 1V8 levels.
 - nvidia,only-1-8-v : The presence of this property indicates that the
   controller operates at a 1.8 V fixed I/O voltage.
 - nvidia,pad-autocal-pull-up-offset-3v3,