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

Icenowy Zheng
2017-07-26T07:16:31Z

于 2017年7月26日 GMT+08:00 下午3:08:06, Chen-Yu Tsai <wens@csie.org> 写到:
>On Sun, Jul 23, 2017 at 6:27 PM, Icenowy Zheng <icenowy@aosc.io> wrote:
>> From: Ondrej Jirman <megous@megous.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@megous.com>
>> [Icenowy: Enable DVFS in this patch, slight changes and change commit
>> message]
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.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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