From: Adam Ford <aford173@gmail.com> To: linux-arm-kernel@lists.infradead.org Cc: adam.ford@logicpd.com, shawnguo@kernel.org, Adam Ford <aford173@gmail.com>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ARM: dts: imx6q-logicpd: Fix 3.3V regulator on SDHC1 Date: Tue, 1 Oct 2019 19:37:13 -0500 [thread overview] Message-ID: <20191002003713.21332-2-aford173@gmail.com> (raw) In-Reply-To: <20191002003713.21332-1-aford173@gmail.com> NVCC_SD1 is driven by a selector which chooses between 3.3V and 1.8. Currently, this is pulled down by a 10k resistor, but occasionally, voltage spikes on this rail cause the regulator to jump between 1.8 and 3.3V. This patch explicitly sets GPIO_19 to choose the 3.3V rail by forcing this IO pin low to stabilize NVCC_SD1. Signed-off-by: Adam Ford <aford173@gmail.com> diff --git a/arch/arm/boot/dts/imx6-logicpd-som.dtsi b/arch/arm/boot/dts/imx6-logicpd-som.dtsi index 547fb141ec0c..233762acbaaf 100644 --- a/arch/arm/boot/dts/imx6-logicpd-som.dtsi +++ b/arch/arm/boot/dts/imx6-logicpd-som.dtsi @@ -15,6 +15,18 @@ reg = <0x10000000 0x80000000>; }; + reg_sdhc1: regulator-sdhc1 { + compatible = "regulator-fixed"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_reg_sdhc1>; + regulator-name = "reg_sdhc1"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + gpio = <&gpio4 5 GPIO_ACTIVE_LOW>; + startup-delay-us = <70000>; + enable-active-high; + }; + reg_wl18xx_vmmc: regulator-wl18xx { compatible = "regulator-fixed"; regulator-name = "vwl1837"; @@ -267,6 +279,12 @@ >; }; + pinctrl_reg_sdhc1: regsdhc1grp { + fsl,pins = < + MX6QDL_PAD_GPIO_19__GPIO4_IO05 0x1b0b0 + >; + }; + pinctrl_tempsense: tempsensegrp { fsl,pins = < MX6QDL_PAD_NANDF_CS2__GPIO6_IO15 0x1b0b0 @@ -343,7 +361,9 @@ non-removable; keep-power-in-suspend; wakeup-source; + no-1-8-v; vmmc-supply = <&sw2_reg>; + vqmmc-supply = <®_sdhc1>; status = "okay"; }; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Adam Ford <aford173@gmail.com> To: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Fabio Estevam <festevam@gmail.com>, shawnguo@kernel.org, Sascha Hauer <s.hauer@pengutronix.de>, linux-kernel@vger.kernel.org, adam.ford@logicpd.com, Rob Herring <robh+dt@kernel.org>, NXP Linux Team <linux-imx@nxp.com>, Pengutronix Kernel Team <kernel@pengutronix.de>, Adam Ford <aford173@gmail.com> Subject: [PATCH] ARM: dts: imx6q-logicpd: Fix 3.3V regulator on SDHC1 Date: Tue, 1 Oct 2019 19:37:13 -0500 [thread overview] Message-ID: <20191002003713.21332-2-aford173@gmail.com> (raw) In-Reply-To: <20191002003713.21332-1-aford173@gmail.com> NVCC_SD1 is driven by a selector which chooses between 3.3V and 1.8. Currently, this is pulled down by a 10k resistor, but occasionally, voltage spikes on this rail cause the regulator to jump between 1.8 and 3.3V. This patch explicitly sets GPIO_19 to choose the 3.3V rail by forcing this IO pin low to stabilize NVCC_SD1. Signed-off-by: Adam Ford <aford173@gmail.com> diff --git a/arch/arm/boot/dts/imx6-logicpd-som.dtsi b/arch/arm/boot/dts/imx6-logicpd-som.dtsi index 547fb141ec0c..233762acbaaf 100644 --- a/arch/arm/boot/dts/imx6-logicpd-som.dtsi +++ b/arch/arm/boot/dts/imx6-logicpd-som.dtsi @@ -15,6 +15,18 @@ reg = <0x10000000 0x80000000>; }; + reg_sdhc1: regulator-sdhc1 { + compatible = "regulator-fixed"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_reg_sdhc1>; + regulator-name = "reg_sdhc1"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + gpio = <&gpio4 5 GPIO_ACTIVE_LOW>; + startup-delay-us = <70000>; + enable-active-high; + }; + reg_wl18xx_vmmc: regulator-wl18xx { compatible = "regulator-fixed"; regulator-name = "vwl1837"; @@ -267,6 +279,12 @@ >; }; + pinctrl_reg_sdhc1: regsdhc1grp { + fsl,pins = < + MX6QDL_PAD_GPIO_19__GPIO4_IO05 0x1b0b0 + >; + }; + pinctrl_tempsense: tempsensegrp { fsl,pins = < MX6QDL_PAD_NANDF_CS2__GPIO6_IO15 0x1b0b0 @@ -343,7 +361,9 @@ non-removable; keep-power-in-suspend; wakeup-source; + no-1-8-v; vmmc-supply = <&sw2_reg>; + vqmmc-supply = <®_sdhc1>; status = "okay"; }; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-10-02 0:37 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-02 0:37 [PATCH] ARM: dts: imx6q-logicpd: Fix 3.3V regulator on SDHC1 Adam Ford 2019-10-02 0:37 ` Adam Ford 2019-10-02 0:37 ` Adam Ford [this message] 2019-10-02 0:37 ` Adam Ford
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