From: Grant Likely <redacted>

Add hooks to read gpio configuration out of the device tree node.

[grant.likely: Rewrite of original patch from John Bonesio]
Signed-off-by: Grant Likely <redacted>
[swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly]
[swarren: Reworked to avoid #ifdef CONFIG_OF]
[swarren: Reworked binding based on fsl-imx-esdhc.txt]
[swarren: Documented binding]
Signed-off-by: Stephen Warren <redacted>
---
Theoretically, these two patches should be merged in order in one place,
since the 2nd logically depends on the first. However, it's really just
a documentation dependency, so I think it's fine to merge them into the
MMC and DT trees separately and let them meet in linux-next.

 .../devicetree/bindings/mmc/nvidia-sdhci.txt       |   25 ++++++++++
 drivers/mmc/host/sdhci-tegra.c                     |   51 +++++++++++++++----
 2 files changed, 65 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt

diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
new file mode 100644
index 0000000..c87f667
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt

@@ -0,0 +1,25 @@
+* NVIDIA Tegra Secure Digital Host Controller
+
+This controller on Tegra family SoCs provides an interface for MMC, SD,
+and SDIO types of memory cards.
+
+Required properties:
+- compatible : Should be "nvidia,<chip>-sdhci"
+- reg : Should contain eSDHC registers location and length
+- interrupts : Should contain eSDHC interrupt