arm64: dts: ti: k3-am625-verdin: fix SD_1 power supplies

+V3.3_1.8_SD regulator needs to be always on, otherwise SD I/O is not
powered.

Remove regulator-boot-on from vqmmc, this is a 2 states regulator (3.3V
or 1.8V), there is no option to have it off, therefore it does not make
any sense to mark it as 'boot-on'.

Set valid LDO1 regulator range to be min/max 3.3V, this is mainly
for documentation purpose WRT to the following note in the datasheet:

```
If an LDO is configured in bypass-mode, its output voltage must be
configured and the PVIN_LDOx supply voltage must match the configured
output voltage. PVIN_LDOx shall be within (configured VOUT) and
(configured VOUT + 200mV). Violation of this may result in instability.
```

No software is actually writing to it, but given that we use it in
bypass-mode and the supply is 3.3V, it must be really configured as
3.3V.

Upstream-Status: Pending

Initial DTS to be used for bring-up an validation of the V1.0 design,
we'll decide on the step forward to mainline this once the bring-up
and validation will be done.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/arm64/boot/dts/ti/k3-am625-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am625-verdin.dtsi
index 4df9e6af9b52..9ed04c75000c 100644
--- a/arch/arm64/boot/dts/ti/k3-am625-verdin.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am625-verdin.dtsi
@@ -199,7 +199,6 @@
 		regulator-name = "LDO1-VSEL-SD (PMIC)";
 		regulator-min-microvolt = <1800000>;
 		regulator-max-microvolt = <3300000>;
-		regulator-boot-on;
 		states = <1800000 0x0>,
 			 <3300000 0x1>;
 		vin-supply = <&reg_sd_3v3_1v8>;
@@ -1160,8 +1159,10 @@
 
 			reg_sd_3v3_1v8: ldo1 {
 				regulator-allow-bypass;
+				regulator-always-on;
+				regulator-boot-on;
 				regulator-max-microvolt = <3300000>;
-				regulator-min-microvolt = <1800000>;
+				regulator-min-microvolt = <3300000>;
 				regulator-name = "+V3.3_1.8_SD (PMIC LDO1)";
 			};