diff mbox

[v2,1/2] mmc: sdhci: dt: Add device tree properties sdhci-caps and sdhci-caps-mask

Message ID 1478100376-602-2-git-send-email-zach.brown@ni.com (mailing list archive)
State New, archived
Headers show

Commit Message

Zach Brown Nov. 2, 2016, 3:26 p.m. UTC 
On some systems the sdhci capabilty register is incorrect for one
reason or another.

The sdhci-caps-mask property specifies which bits in the register
are incorrect and should be turned off before using sdhci-caps to turn
on bits.

The sdhci-caps property specifies which bits should be turned on.

Signed-off-by: Zach Brown <zach.brown@ni.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/mmc/sdhci.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/sdhci.txt
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/mmc/sdhci.txt b/Documentation/devicetree/bindings/mmc/sdhci.txt
new file mode 100644
index 0000000..0f4f1bb
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/sdhci.txt
@@ -0,0 +1,14 @@ 
+The properties specific for SD host controllers. For properties shared by MMC
+host controllers refer to the mmc[1] bindings.
+
+  [1] Documentation/devicetree/bindings/mmc/mmc.txt
+
+Optional properties:
+- sdhci-caps-mask: The sdhci capabilities register is incorrect. This 64bit
+  property corresponds to the bits in the sdhci capabilty register. If the bit
+  is on in the mask then the bit is incorrect in the register and should be
+  turned off, before applying sdhci-caps.
+- sdhci-caps: The sdhci capabilities register is incorrect. This 64bit
+  property corresponds to the bits in the sdhci capability register. If the
+  bit is on in the property then the bit should be turned on.
+