Re: [PATCH 03/15] arm64: dts: imx8mp-evk: fix BUCK/LDO voltage
From: Peng Fan
Date: Fri Oct 21 2022 - 05:14:47 EST
Hi Marco
On 10/20/2022 7:02 PM, Marco Felsch wrote:
Hi Peng,
On 22-10-20, Peng Fan (OSS) wrote:
From: Peng Fan <peng.fan@xxxxxxx>
Per PCA9450C datasheet, the voltage range as below:
BUCK1 0.6 - 2.1875
BUCK2 0.6 - 2.1875
BUCK4 0.6 - 3.4
BUCK5 0.6 - 3.4
BUCK6 0.6 - 3.4
LDO1 1.6-1.9, 3.0-3.3
LDO2 0.8 – 1.15
LDO3 0.8 - 3.3
LDO4 0.8 - 3.3
LDO5 1.8 - 3.3
So correct them, and also add LDO[2,4]
In the DTS you specify voltage constraints for a specific hardware and
not the one supported by the PMIC. What the PMIC supports (min/max) is
specified within the driver.
Technically we could set board voltage to PMIC voltage range, it not
damage the board from hardware level.
but I am not sure whether Linux could work proper.
Saying set VDD_SOC/DDR to pmic min voltage, system will crash,
because it could not support higher freq.
I am not sure how to proceed on this, just update commit log
to say that the board voltage range could be set to pmic voltage range?
Thanks,
Peng.
Regards,
Marco
Fixes: 5497bc2a2bff ("arm64: dts: imx8mp-evk: Add PMIC device")
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 44 +++++++++++++-------
1 file changed, 30 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
index b4c1ef2559f2..a4cddc5a8620 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
@@ -248,8 +248,8 @@ pmic@25 {
regulators {
BUCK1 {
regulator-name = "BUCK1";
- regulator-min-microvolt = <720000>;
- regulator-max-microvolt = <1000000>;
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <2187500>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <3125>;
@@ -257,8 +257,8 @@ BUCK1 {
reg_arm: BUCK2 {
regulator-name = "BUCK2";
- regulator-min-microvolt = <720000>;
- regulator-max-microvolt = <1025000>;
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <2187500>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <3125>;
@@ -268,40 +268,56 @@ reg_arm: BUCK2 {
BUCK4 {
regulator-name = "BUCK4";
- regulator-min-microvolt = <3000000>;
- regulator-max-microvolt = <3600000>;
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
regulator-boot-on;
regulator-always-on;
};
BUCK5 {
regulator-name = "BUCK5";
- regulator-min-microvolt = <1650000>;
- regulator-max-microvolt = <1950000>;
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
regulator-boot-on;
regulator-always-on;
};
BUCK6 {
regulator-name = "BUCK6";
- regulator-min-microvolt = <1045000>;
- regulator-max-microvolt = <1155000>;
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
regulator-boot-on;
regulator-always-on;
};
LDO1 {
regulator-name = "LDO1";
- regulator-min-microvolt = <1650000>;
- regulator-max-microvolt = <1950000>;
+ regulator-min-microvolt = <1600000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ LDO2 {
+ regulator-name = "LDO2";
+ regulator-min-microvolt = <800000>;
+ regulator-max-microvolt = <1150000>;
regulator-boot-on;
regulator-always-on;
};
LDO3 {
regulator-name = "LDO3";
- regulator-min-microvolt = <1710000>;
- regulator-max-microvolt = <1890000>;
+ regulator-min-microvolt = <800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo4: LDO4 {
+ regulator-name = "LDO4";
+ regulator-min-microvolt = <800000>;
+ regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};
--
2.37.1