Messages in this thread Patch in this message | | | From | Marcel Ziswiler <> | Subject | [PATCH v3 01/13] ARM: dts: imx6ull-colibri: use pull-down for adc pins | Date | Fri, 6 May 2022 15:24:04 +0200 |
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From: Philippe Schenker <philippe.schenker@toradex.com>
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> ---
(no changes since v1)
arch/arm/boot/dts/imx6ull-colibri.dtsi | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/boot/dts/imx6ull-colibri.dtsi b/arch/arm/boot/dts/imx6ull-colibri.dtsi index 7f35a06dff95..84bb7574d211 100644 --- a/arch/arm/boot/dts/imx6ull-colibri.dtsi +++ b/arch/arm/boot/dts/imx6ull-colibri.dtsi @@ -52,6 +52,8 @@ reg_sd1_vmmc: regulator-sd1-vmmc { &adc1 { num-channels = <10>; vref-supply = <®_module_3v3_avdd>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_adc1>; }; &can1 { @@ -214,6 +216,16 @@ &wdog1 { }; &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 */ -- 2.35.1
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