On Tue, Jan 26, 2016 at 10:12:20AM +0100, Enric Balletbo i Serra wrote:
> 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>;
> microchip,pin-ignore;
> };
>
> Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
> ---
> .../devicetree/bindings/power/ucs1002.txt | 47
> ++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/power/ucs1002.txt
>
> diff --git a/Documentation/devicetree/bindings/power/ucs1002.txt
> b/Documentation/devicetree/bindings/power/ucs1002.txt
> new file mode 100644
> index 0000000..1b89f0a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/ucs1002.txt
> @@ -0,0 +1,47 @@
> +UCS1002-2 Programmable USB Port Power Controller with Charger Emulation
> bindings
> +
> +Required properties:
> +- compatible: "microchip,ucs1002"
> +- reg: integer, the I2C address of the device.
> +
> +Required properties (if pin-ignore functionality is not set):
> +- em-gpios: which GPIO to use for EM_EN pin.
> +- pwr-gpios: which GPIO to use for PWR_EN pin.
> +- m1-gpios: which GPIO to use for M1 pin.
> +- m2-gpios: which GPIO to use for M2 pin.
> +
> +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 mA. Note that the
> default
mA or ...
> + 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, 2500000 (uA)
uA?
Either way append units (-microamps)
> +- microchip,pin-ignore: boolean, if present uses I2C for configuration,
> otherwise,
> + we must provide EM_EN, M1 and M2 gpio mapping.
Wouldn't this be implied by absence of gpio properties?
> +
> +Example (poll):
> +
> + ucs1002: ucs1002@57 {
> + compatible = "microchip,ucs1002";
> + reg = <0x57>;
> + microchip,current-limit = <2000000>;
> + microchip,pin-ignore;
> + };
> +
> +Example (interrupts + pin control):
> +
> + ucs1002: ucs1002@57 {
> + compatible = "microchip,ucs1002";
> + reg = <0x57>;
> + interrupt-parent = <&gpio0>;
> + interrupts = <30 0>, <31 0>;
> + microchip,current-limit = <2000000>;
> + em-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
> + m1-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
> + m2-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
> + pwr-gpios = <&gpio1 19 0>;
> + };
> --
> 2.1.0
>
