linux/arch/arm/boot/dts/imx53-qsb.dts
Fabio Estevam 4480de8245 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>
2017-03-08 14:59:03 +01:00

119 lines
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/*
* Copyright 2011 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/dts-v1/;
#include "imx53-qsb-common.dtsi"
/ {
model = "Freescale i.MX53 Quick Start Board";
compatible = "fsl,imx53-qsb", "fsl,imx53";
};
&i2c1 {
pmic: dialog@48 {
compatible = "dlg,da9053-aa", "dlg,da9052";
reg = <0x48>;
interrupt-parent = <&gpio7>;
interrupts = <11 0x8>; /* low-level active IRQ at GPIO7_11 */
regulators {
buck1_reg: buck1 {
regulator-min-microvolt = <500000>;
regulator-max-microvolt = <2075000>;
regulator-always-on;
};
buck2_reg: buck2 {
regulator-min-microvolt = <500000>;
regulator-max-microvolt = <2075000>;
regulator-always-on;
};
buck3_reg: buck3 {
regulator-min-microvolt = <925000>;
regulator-max-microvolt = <2500000>;
regulator-always-on;
};
buck4_reg: buck4 {
regulator-min-microvolt = <925000>;
regulator-max-microvolt = <2500000>;
regulator-always-on;
};
ldo1_reg: ldo1 {
regulator-min-microvolt = <600000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
ldo2_reg: ldo2 {
regulator-min-microvolt = <600000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};
ldo3_reg: ldo3 {
regulator-min-microvolt = <1725000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
};
ldo4_reg: ldo4 {
regulator-min-microvolt = <1725000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
};
ldo5_reg: ldo5 {
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <3600000>;
regulator-always-on;
};
ldo6_reg: ldo6 {
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <3600000>;
regulator-always-on;
};
ldo7_reg: ldo7 {
regulator-min-microvolt = <2750000>;
regulator-max-microvolt = <2750000>;
};
ldo8_reg: ldo8 {
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <3600000>;
regulator-always-on;
};
ldo9_reg: ldo9 {
regulator-min-microvolt = <1250000>;
regulator-max-microvolt = <3600000>;
regulator-always-on;
};
ldo10_reg: ldo10 {
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <3600000>;
regulator-always-on;
};
};
};
};
&tve {
dac-supply = <&ldo7_reg>;
};