ARM: dts: imx53-qsb: Constrain the TVE DAC voltage

Quoting Philipp Zabel:
"Since this regulator is used as the TVDAC analog power supply, this
range should at least be limited to the analog power supply range of the
TVDAC, listed in Table 74-9. of the i.MX53 reference manual (2.5-2.75V).

But since the nominal voltage is 2.75V, which was used to determine the
analog gain that is supposed to result in the necessary 0.7V
peak-to-peak amplitude on the VGA output, I'd say we should just fix the
voltage to 2750000 here."

, so limit the TVDAC analog power supply as suggested.

Suggested-by: Lucas Stach <l.stach@pengutronix.de>
Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx53-qsb.dts b/arch/arm/boot/dts/imx53-qsb.dts
index f4c158cce908e9fd77ec78c1e79ffa0b18cd0a45..d3d662e376772182e13f24df1152bca84e14df0e 100644 (file)
--- a/arch/arm/boot/dts/imx53-qsb.dts
+++ b/arch/arm/boot/dts/imx53-qsb.dts
@@ -88,8 +88,8 @@
                        };
 
                        ldo7_reg: ldo7 {
-                               regulator-min-microvolt = <1200000>;
-                               regulator-max-microvolt = <3600000>;
+                               regulator-min-microvolt = <2750000>;
+                               regulator-max-microvolt = <2750000>;
                        };
 
                        ldo8_reg: ldo8 {

diff --git a/arch/arm/boot/dts/imx53-qsrb.dts b/arch/arm/boot/dts/imx53-qsrb.dts
index 479ca4c9e3841671db80573b18a65f709e0a306e..de221583237276a5b4cd57c7de724c8cbbf9ec57 100644 (file)
--- a/arch/arm/boot/dts/imx53-qsrb.dts
+++ b/arch/arm/boot/dts/imx53-qsrb.dts
@@ -128,8 +128,8 @@
 
                        vdac_reg: vdac {
                                regulator-name = "VDAC";
-                               regulator-min-microvolt = <2500000>;
-                               regulator-max-microvolt = <2775000>;
+                               regulator-min-microvolt = <2750000>;
+                               regulator-max-microvolt = <2750000>;
                        };
 
                        vgen1_reg: vgen1 {