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authorBaolin Wang <baolin.wang@linaro.org>2019-08-14 15:46:10 +0300
committerThierry Reding <thierry.reding@gmail.com>2019-09-21 02:15:25 +0300
commitbdaadd5948179f07ca8b508a62a8f8b00ece51ed (patch)
tree88b498096e7267a1b3dbe321b6eef2d6a121c63c /Documentation/devicetree
parent8d190728fd8e272b733e1575e000fc1982b5d9b2 (diff)
downloadlinux-bdaadd5948179f07ca8b508a62a8f8b00ece51ed.tar.xz
dt-bindings: pwm: sprd: Add Spreadtrum PWM documentation
Add Spreadtrum PWM controller documentation. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/pwm/pwm-sprd.txt40
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diff --git a/Documentation/devicetree/bindings/pwm/pwm-sprd.txt b/Documentation/devicetree/bindings/pwm/pwm-sprd.txt
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+Spreadtrum PWM controller
+
+Spreadtrum SoCs PWM controller provides 4 PWM channels.
+
+Required properties:
+- compatible : Should be "sprd,ums512-pwm".
+- reg: Physical base address and length of the controller's registers.
+- clocks: The phandle and specifier referencing the controller's clocks.
+- clock-names: Should contain following entries:
+ "pwmn": used to derive the functional clock for PWM channel n (n range: 0 ~ 3).
+ "enablen": for PWM channel n enable clock (n range: 0 ~ 3).
+- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
+ the cells format.
+
+Optional properties:
+- assigned-clocks: Reference to the PWM clock entries.
+- assigned-clock-parents: The phandle of the parent clock of PWM clock.
+
+Example:
+ pwms: pwm@32260000 {
+ compatible = "sprd,ums512-pwm";
+ reg = <0 0x32260000 0 0x10000>;
+ clock-names = "pwm0", "enable0",
+ "pwm1", "enable1",
+ "pwm2", "enable2",
+ "pwm3", "enable3";
+ clocks = <&aon_clk CLK_PWM0>, <&aonapb_gate CLK_PWM0_EB>,
+ <&aon_clk CLK_PWM1>, <&aonapb_gate CLK_PWM1_EB>,
+ <&aon_clk CLK_PWM2>, <&aonapb_gate CLK_PWM2_EB>,
+ <&aon_clk CLK_PWM3>, <&aonapb_gate CLK_PWM3_EB>;
+ assigned-clocks = <&aon_clk CLK_PWM0>,
+ <&aon_clk CLK_PWM1>,
+ <&aon_clk CLK_PWM2>,
+ <&aon_clk CLK_PWM3>;
+ assigned-clock-parents = <&ext_26m>,
+ <&ext_26m>,
+ <&ext_26m>,
+ <&ext_26m>;
+ #pwm-cells = <2>;
+ };