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

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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>
This commit is contained in:
Fabio Estevam 2017-02-08 10:33:51 -02:00 committed by Shawn Guo
parent 2e2c3a5a97
commit 4480de8245
2 changed files with 4 additions and 4 deletions
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4
arch/arm/boot/dts/imx53-qsb.dts
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@ -88,8 +88,8 @@
}; };
ldo7_reg: ldo7 { ldo7_reg: ldo7 {
regulator-min-microvolt = <1200000>; regulator-min-microvolt = <2750000>;
regulator-max-microvolt = <3600000>; regulator-max-microvolt = <2750000>;
}; };
ldo8_reg: ldo8 { ldo8_reg: ldo8 {

4
arch/arm/boot/dts/imx53-qsrb.dts
View File

@ -128,8 +128,8 @@
vdac_reg: vdac { vdac_reg: vdac {
regulator-name = "VDAC"; regulator-name = "VDAC";
regulator-min-microvolt = <2500000>; regulator-min-microvolt = <2750000>;
regulator-max-microvolt = <2775000>; regulator-max-microvolt = <2750000>;
}; };
vgen1_reg: vgen1 { vgen1_reg: vgen1 {