Commit 5cd41fe8 authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Ulf Hansson

dt-bindings: sdhci-of-at91: add the microchip,sdcal-inverted property

Add the specific microchip,sdcal-inverted property to at91 sdhci
device binding.
This optional property describes how the SoC SDCAL pin is connected.
It could be handled at SiP, SoM or board level.

This property read by at91 sdhci driver will allow to put in place a
software workaround that would reduce power consumption.
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 61a14e52
...@@ -9,6 +9,11 @@ Required properties: ...@@ -9,6 +9,11 @@ Required properties:
- clocks: Phandlers to the clocks. - clocks: Phandlers to the clocks.
- clock-names: Must be "hclock", "multclk", "baseclk"; - clock-names: Must be "hclock", "multclk", "baseclk";
Optional properties:
- microchip,sdcal-inverted: when present, polarity on the SDCAL SoC pin is
inverted. The default polarity for this signal is described in the datasheet.
For instance on SAMA5D2, the pin is usually tied to the GND with a resistor
and a capacitor (see "SDMMC I/O Calibration" chapter).
Example: Example:
......
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