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[v3,10/15] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock

Message ID 1466445414-11974-11-git-send-email-dianders@chromium.org
State New, archived
Headers show

Commit Message

Doug Anderson June 20, 2016, 5:56 p.m. UTC
Some SD/eMMC PHYs (like the PHY from Arasan that is designed to work
with arasan,sdhci-5.1) need to know the card clock frequency in order to
function properly.  Physically in a SoC this clock is exported from the
SDHCI IP block to the PHY IP block and the PHY needs to know the speed.
Let's export the SDHCI card clock using a standard device tree mechanism
so that the PHY can get access to it and query the card clock frequency.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Changes in v3:
- Add collected tags

Changes in v2:
- Adjust commit message wording (Rob)
- Add Rob Herring's Ack.

 Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 8 ++++++++
 1 file changed, 8 insertions(+)
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diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index 476604e6ce2a..3404afa9b938 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -30,6 +30,12 @@  Optional Properties:
   - arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
     used to access core corecfg registers.  Offsets of registers in this
     syscon are determined based on the main compatible string for the device.
+  - clock-output-names: If specified, this will be the name of the card clock
+    which will be exposed by this device.  Required if #clock-cells is
+    specified.
+  - #clock-cells: If specified this should be the value <0>.  With this property
+    in place we will export a clock representing the Card Clock.  This clock
+    is expected to be consumed by our PHY.  You must also specify
 	sdhci@e0100000 {
@@ -61,7 +67,9 @@  Example:
 		arasan,soc-ctl-syscon = <&grf>;
 		assigned-clocks = <&cru SCLK_EMMC>;
 		assigned-clock-rates = <200000000>;
+		clock-output-names = "emmc_cardclock";
 		phys = <&emmc_phy>;
 		phy-names = "phy_arasan";
+		#clock-cells = <0>;
 		status = "disabled";