Commit 3f781d5c authored by Philippe Schenker's avatar Philippe Schenker Committed by Shawn Guo
Browse files

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: default avatarPhilippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: default avatarDenys Drozdov <denys.drozdov@toradex.com>
Signed-off-by: default avatarMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 6192cf8a

arch/arm/boot/dts/imx6ull-colibri.dtsi

+12 −0
Original line number Diff line number Diff line
@@ -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 */