在 2017-07-26 15:30，Chen-Yu Tsai 写道：
On Wed, Jul 26, 2017 at 3:16 PM, Icenowy Zheng <icenowy@xxxxxxx> wrote:
于 2017年7月26日 GMT+08:00 下午3:08:06, Chen-Yu Tsai <wens@xxxxxxxx> 写到:
On Sun, Jul 23, 2017 at 6:27 PM, Icenowy Zheng <icenowy@xxxxxxx>
wrote:
From: Ondrej Jirman <megous@xxxxxxxxxx>
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@xxxxxxxxxx>
[Icenowy: Enable DVFS in this patch, slight changes and change
commit
message]
Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx>
---
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 = <®_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...
Can you provide a link?
If Armbian users have actually field tested this (a big if),
then I would like to see some evidence of the SoC running
stably at those OPPs with those lower voltages under full load.
See [1].
[1]
https://github.com/armbian/build/blob/master/config/fex/orangepipc.fex#L736
Even then you should still leave a note describing why we allow
voltages below the recommended range.
ChenYu
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).
I don't know...
Maybe I should ask Ondrej?
ChenYu
+ regulator-boot-on;
+ regulator-always-on;
+ };
+};
+
&r_pio {
leds_r_opc: led_pins@0 {
pins = "PL10";
--
2.13.0
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