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ARM: dts: imx6ull-colibri: use pull-down for adc pins 

Disable the keeper and enable a 100k pull-down on the ADC pins as per
the following note in section 13.2 of the i.MX 6ULL Application
Processor Reference Manual, Rev. 1, 11/2017 [1]:

The keeper causes an undesired jump behavior in ADC. To avoid the
problem, disable keeper before starting ADC.

[1] https://www.nxp.com/webapp/Download?colCode=IMX6ULLRM

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Denys Drozdov <denys.drozdov@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Philippe Schenker 2022-05-06 15:24:04 +02:00 committed by Shawn Guo
parent 6192cf8ac0
commit 3f781d5c67
1 changed files with 12 additions and 0 deletions
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12
arch/arm/boot/dts/imx6ull-colibri.dtsi
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@ -52,6 +52,8 @@
&adc1 {
num-channels = <10>;
vref-supply = <&reg_module_3v3_avdd>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_adc1>;
};
&can1 {
@ -214,6 +216,16 @@
};
&iomuxc {
pinctrl_adc1: adc1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO00__GPIO1_IO00 0x3000 /* SODIMM 8 */
MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0x3000 /* SODIMM 6 */
MX6UL_PAD_GPIO1_IO08__GPIO1_IO08 0x3000 /* SODIMM 4 */
MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0x3000 /* SODIMM 2 */
>;
};
pinctrl_can_int: canint-grp {
fsl,pins = <
MX6UL_PAD_ENET1_TX_DATA1__GPIO2_IO04 0x13010 /* SODIMM 73 */