linux-kernel - [PATCH v2 01/14] ARM: dts: imx6ull-colibri: use pull-down for adc pins

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Date:   Mon, 25 Apr 2022 18:23:43 +0200
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Philippe Schenker <philippe.schenker@...adex.com>,
        Denys Drozdov <denys.drozdov@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/14] ARM: dts: imx6ull-colibri: use pull-down for adc pins

From: Philippe Schenker <philippe.schenker@...adex.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@...adex.com>
Signed-off-by: Denys Drozdov <denys.drozdov@...adex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.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 951a2a6c5a65..eb13ed60d2e4 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 = <&reg_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