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

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Date:   Wed, 26 Jul 2017 15:16:16 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Chen-Yu Tsai <wens@...e.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        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



于 2017年7月26日 GMT+08:00 下午3:08:06, Chen-Yu Tsai <wens@...e.org> 写到:
>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.

But the Armbian OPP table for H3 contains several
OPP under 1.1V...

>
>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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