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>
---
Changes in v2:
- Reduce maximum voltage to 1.3V.
- Slightly changed the comment at 1.0V minimum voltage for taking BSP
DVFS table instead of Armbian one.
arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
index d22546df1b82..ded9d8d6d008 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 +164,29 @@
};
};
+&r_i2c {
+ status = "okay";
+
+ reg_sy8106a: regulator@65 {
+ compatible = "silergy,sy8106a";
+ reg = <0x65>;
+ regulator-name = "vdd-cpux";
+ /*
+ * The datasheet uses 1.1V as the minimum value of VDD-CPUX,
+ * however both the Armbian DVFS table and the official one
+ * have operating points with voltage under 1.1V, and both
+ * DVFS table are known to work properly at the lowest
+ * operating point.
+ *
+ * Use 1.0V as the minimum voltage instead.
+ */
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+};
+
&r_pio {
leds_r_opc: led_pins {
pins = "PL10";
--
2.15.1
--
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