linux-kernel - Re: [linux-sunxi] [PATCH 10/10] ARM: dts: sun8i: Add SY8106A regulator to Orange Pi PC

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Message-ID: <CAGb2v66AGjazHT-+hWVLyNBLDw=DJ5yTmNxF-_=BtZFfjnni-A@mail.gmail.com>
Date:   Wed, 26 Jul 2017 15:08:06 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Ondrej Jirman <megous@...ous.com>
Subject: Re: [linux-sunxi] [PATCH 10/10] ARM: dts: sun8i: Add SY8106A
 regulator to Orange Pi PC

On Sun, Jul 23, 2017 at 6:27 PM, Icenowy Zheng <icenowy@...c.io> wrote:
> From: Ondrej Jirman <megous@...ous.com>
>
> Add SY8106A regulator to r_i2c bus and enable the r_i2c bus on
> Orange Pi PC, then set the power supply of the ARM cores to this
> regulator, in order to enable DVFS.
>
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> [Icenowy: Enable DVFS in this patch, slight changes and change commit
>  message]
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
> index 998b60f8d295..d855f8b6254e 100644
> --- a/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
> +++ b/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
> @@ -98,6 +98,10 @@
>         status = "okay";
>  };
>
> +&cpu0 {
> +       cpu-supply = <&reg_sy8106a>;
> +};
> +
>  &ehci0 {
>         status = "okay";
>  };
> @@ -160,6 +164,21 @@
>         };
>  };
>
> +&r_i2c {
> +       status = "okay";
> +
> +       reg_sy8106a: regulator@65 {
> +               compatible = "silergy,sy8106a";
> +               reg = <0x65>;
> +               regulator-name = "vdd-cpux";
> +               regulator-min-microvolt = <1000000>;

According to the H3 datasheet, the minimum voltage is 1.1V, not 1V.

Otherwse

> +               regulator-max-microvolt = <1400000>;
> +               regulator-ramp-delay = <200>;

Is this an actual constraint of the SoC? Or is it a characteristic
of the regulator? If it is the latter, it belongs in the driver.
AFAIK the regulator supports varying the ramp delay (slew rate).

ChenYu

> +               regulator-boot-on;
> +               regulator-always-on;
> +       };
> +};
> +
>  &r_pio {
>         leds_r_opc: led_pins@0 {
>                 pins = "PL10";
> --
> 2.13.0
>
> --
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