Re: [PATCHv2 1/2] devicetree: Add UCS1002 USB Port Power Controller binding
From: Rob Herring <robh@kernel.org>
Date: 2016-02-22 02:54:55
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linux-devicetree, lkml
On Thu, Feb 18, 2016 at 10:52:50AM +0100, Enric Balletbo i Serra wrote:
quoted hunk ↗ jump to hunk
The UCS1002-2 provides a USB port power switch for precise control of up to 2.5 amperes continuous current. You can add support to your board with current binding. Example: ucs1002: ucs1002@57 { compatible = "microchip,ucs1002"; reg = <0x57>; }; Signed-off-by: Enric Balletbo i Serra <redacted> --- Changes since v1: - Fix units, are microamps (Rob Herring) - Remove microchip,pin-ignore as is implied by absence of gpio properties (Rob Herring) - Group control gpios instead of use separate gpios. All control gpios must be set together (Enric Balletbo) .../devicetree/bindings/power/ucs1002.txt | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/ucs1002.txtdiff --git a/Documentation/devicetree/bindings/power/ucs1002.txt b/Documentation/devicetree/bindings/power/ucs1002.txt new file mode 100644 index 0000000..bb2f91e --- /dev/null +++ b/Documentation/devicetree/bindings/power/ucs1002.txt@@ -0,0 +1,41 @@ +UCS1002-2 Programmable USB Port Power Controller with Charger Emulation bindings + +Required properties: +- compatible: "microchip,ucs1002" +- reg: integer, the I2C address of the device. + +Optional properties: +- interrupt-parent: the phandle of the interrupt controller that services + interrupts for this device. +- interrupts: interrupt specifiers for two interrupt sources. + - First interrupt specifier is for A_DET interrupt. + - Second interrupt specifier is for ALERT interrupt. +- microchip,current-limit: integer, maximum current in microamps. Note that the
This needs a microamps as a suffix (e.g. microchip,current-limit-microamps). That's kind of long, so maybe drop "current" from the name as that is implied with the units.
+ default value is based on the resistor on the COMM_SEL/ILIM pin and this
+ value cannot be changed to be higher than hardware set value. Accepted
+ values are: 500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000 and
+ 2500000 (microamps).
+- control-gpios = list of gpios used as pin states when determining the active mode
+ selection and power state. Must provide EM_EN, M1, M2 and PWR_EN gpio mapping.
+ If this property is not set it uses I2C for configuration.
+
+Example (polling):
+
+ ucs1002: ucs1002@57 {
+ compatible = "microchip,ucs1002";
+ reg = <0x57>;
+ microchip,current-limit = <2000000>;
+ };
+
+Example (interrupts + control gpios):
+
+ ucs1002: ucs1002@57 {
+ compatible = "microchip,ucs1002";
+ reg = <0x57>;
+ interrupt-parent = <&gpio0>;
+ interrupts = <30 0>, <31 0>;
+ control-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>, /* EM_EN */
+ <&gpio0 3 GPIO_ACTIVE_HIGH>, /* M1 */
+ <&gpio1 17 GPIO_ACTIVE_HIGH>, /* M2 */
+ <&gpio1 19 0>; /* PWR_EN */
+ };
--
2.1.0