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| author | Fabio Estevam <fabio.estevam@nxp.com> | 2017-02-08 10:33:51 -0200 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2017-03-08 14:59:03 +0100 |
| commit | 4480de8245b7f02c2fa0109efd80f4773397e36a (patch) | |
| tree | 7c4b34dc8517da2d48414ba9d40d9b5b96dde7c9 | |
| parent | 2e2c3a5a97f9e0c82deef6624f8b31bbbc5298ff (diff) | |
| download | blackbird-op-linux-4480de8245b7f02c2fa0109efd80f4773397e36a.tar.gz blackbird-op-linux-4480de8245b7f02c2fa0109efd80f4773397e36a.zip | |
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>
| -rw-r--r-- | arch/arm/boot/dts/imx53-qsb.dts | 4 | ||||
| -rw-r--r-- | arch/arm/boot/dts/imx53-qsrb.dts | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/boot/dts/imx53-qsb.dts b/arch/arm/boot/dts/imx53-qsb.dts index f4c158cce908..d3d662e37677 100644 --- 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 479ca4c9e384..de2215832372 100644 --- 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 { |
