linux-kernel - [PATCH 1/2] mmc: sdhci: dt: Add device tree properties sdhci-caps and sdhci-caps-mask

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Date:   Fri, 28 Oct 2016 10:56:10 -0500
From:   Zach Brown <zach.brown@...com>
To:     <ulf.hansson@...aro.org>
CC:     <adrian.hunter@...el.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <zach.brown@...com>
Subject: [PATCH 1/2] mmc: sdhci: dt: Add device tree properties sdhci-caps and sdhci-caps-mask

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@...com>
---
 Documentation/devicetree/bindings/mmc/sdhci.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/sdhci.txt

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.
+
-- 
2.7.4