summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
parentInitial commit. (diff)
downloadlinux-upstream/5.10.209.tar.xz
linux-upstream/5.10.209.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt')
-rw-r--r--Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt38
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
new file mode 100644
index 000000000..e728786f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
@@ -0,0 +1,38 @@
+Rockchip EMMC PHY
+-----------------------
+
+Required properties:
+ - compatible: rockchip,rk3399-emmc-phy
+ - #phy-cells: must be 0
+ - reg: PHY register address offset and length in "general
+ register files"
+
+Optional properties:
+ - clock-names: Should contain "emmcclk". Although this is listed as optional
+ (because most boards can get basic functionality without having
+ access to it), it is strongly suggested.
+ See ../clock/clock-bindings.txt for details.
+ - clocks: Should have a phandle to the card clock exported by the SDHCI driver.
+ - drive-impedance-ohm: Specifies the drive impedance in Ohm.
+ Possible values are 33, 40, 50, 66 and 100.
+ If not set, the default value of 50 will be applied.
+
+Example:
+
+
+grf: syscon@ff770000 {
+ compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+...
+
+ emmcphy: phy@f780 {
+ compatible = "rockchip,rk3399-emmc-phy";
+ reg = <0xf780 0x20>;
+ clocks = <&sdhci>;
+ clock-names = "emmcclk";
+ drive-impedance-ohm = <50>;
+ #phy-cells = <0>;
+ };
+};