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SubjectRe: [linux-sunxi] [PATCH 2/2] ARM: sun8i: h3: add SY8113B regulator on Banana Pi M2 Zero board
Hi,

On Wed, Jul 11, 2018 at 9:44 PM, Icenowy Zheng <icenowy@aosc.io> wrote:
> Banana Pi M2 Zero board has a SY8113B regulator, which is controlled via
> GPIO and capable of outputing 1.1V when the PL1 GPIO is set to output 0
> or 1.1V when the PL6 GPIO is set to input or output 1, and the output is
> the power supply of the ARM cores in H3 SoC.
>
> Add the device tree node of this regulator and set the cpu's cpu-supply
> property to it.
>
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> .../dts/sun8i-h2-plus-bananapi-m2-zero.dts | 21 +++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> index eb61dcf32797..abc8dc750f4b 100644
> --- a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> +++ b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> @@ -59,6 +59,23 @@
> };
> };
>
> + reg_vdd_cpux: vdd-cpux-regulator {
> + compatible = "regulator-gpio";
> + regulator-name = "vdd-cpux";
> + regulator-type = "voltage";
> + regulator-boot-on;
> + regulator-always-on;
> + regulator-min-microvolt = <1100000>;
> + regulator-max-microvolt = <1300000>;
> + regulator-ramp-delay = <50>; /* 4ms */
> +
> + gpios = <&r_pio 0 1 GPIO_ACTIVE_HIGH>; /* PL1 */
> + enable-active-high;
> + gpios-states = <0x1>;
> + states = <1100000 0x0

So looking at the schematics with the resistor values, this calculates
to roughly 1.108475 (0.6 * (1 + 10 / 11.8)) ...

> + 1300000 0x1>;

and this to 1.308475.

ChenYu

> + };
> +
> wifi_pwrseq: wifi_pwrseq {
> compatible = "mmc-pwrseq-simple";
> pinctrl-names = "default";
> @@ -66,6 +83,10 @@
> };
> };
>
> +&cpu0 {
> + cpu-supply = <&reg_vdd_cpux>;
> +};
> +
> &de {
> status = "okay";
> };
> --
> 2.17.1
>
> --
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