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Subject[PATCH v5 2/2] ARM: dts: colibri: introduce device trees with UHS-I support
Date
From: Igor Opaniuk <igor.opaniuk@toradex.com>

1. Introduce dtsi with overlay configuration for enabling UHS-I
for Colibri iMX6S/DL V1.1x re-design.
2. Introduce new dts for the Colibri iMX6S/DL V1.1x
on Colibri Evaluation Carrier Board V3.x. However, disable 1.8V for
the Colibri Evaluation Board since this carrier board has 3.3V pull-ups on.
3. Provide proper configuration for VGEN3, which allows that rail to
be automatically switched to 1.8 volts for proper UHS-I operation mode.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
---

v5:
- Fix copyright/licensing [Shawn Guo]
- Don't enable 1.8V by default, as some carrier boards have 3.3V pull-ups,
which leads to [ 164.058099] mmc0: error -110 whilst initialising SD
card errors. [Marcel Ziswiler]
- Change hierarchy: move SD-card properties to the module level device
tree include (to explicitly state that these properties relate to module,
not carrier board) + people can easily include it in their custom
carrier board device trees.

v4:
- Document Colibri iMX6S/DL V1.1x re-design devicetree binding [Shawn Guo]
- wakeup-source property fix [Shawn Guo]

v3:
- change hierarchy according to Marco's suggestions [Marco Felsch]
- adjust compatible string adding v1.1 [Stefan Agner]

v2:
- rework hierarchy of dts files, and a separate dtsi for Colibri
iMX6S/DL V1.1x re-design, where UHS-I was added [Marcel Ziswiler]
- add comments about vgen3 power rail [Marcel Ziswiler]
- fix other minor issues, addressing Marcel's comments. [Marcel Ziswiler]

arch/arm/boot/dts/Makefile | 1 +
.../boot/dts/imx6dl-colibri-v1_1-eval-v3.dts | 31 +++++++++++++
.../boot/dts/imx6qdl-colibri-v1_1-uhs.dtsi | 44 +++++++++++++++++++
arch/arm/boot/dts/imx6qdl-colibri.dtsi | 11 ++++-
4 files changed, 86 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/boot/dts/imx6dl-colibri-v1_1-eval-v3.dts
create mode 100644 arch/arm/boot/dts/imx6qdl-colibri-v1_1-uhs.dtsi

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index d6546d2676b9..97da51be1de6 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -412,6 +412,7 @@ dtb-$(CONFIG_SOC_IMX6Q) += \
imx6dl-aristainetos2_4.dtb \
imx6dl-aristainetos2_7.dtb \
imx6dl-colibri-eval-v3.dtb \
+ imx6dl-colibri-v1_1-eval-v3.dtb \
imx6dl-cubox-i.dtb \
imx6dl-cubox-i-emmc-som-v15.dtb \
imx6dl-cubox-i-som-v15.dtb \
diff --git a/arch/arm/boot/dts/imx6dl-colibri-v1_1-eval-v3.dts b/arch/arm/boot/dts/imx6dl-colibri-v1_1-eval-v3.dts
new file mode 100644
index 000000000000..223275f028f1
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-colibri-v1_1-eval-v3.dts
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright 2020 Toradex
+ */
+
+/dts-v1/;
+
+#include "imx6dl-colibri-eval-v3.dts"
+#include "imx6qdl-colibri-v1_1-uhs.dtsi"
+
+/ {
+ model = "Toradex Colibri iMX6DL/S V1.1 on Colibri Evaluation Board V3";
+ compatible = "toradex,colibri_imx6dl-v1_1-eval-v3",
+ "toradex,colibri_imx6dl-v1_1",
+ "toradex,colibri_imx6dl-eval-v3",
+ "toradex,colibri_imx6dl",
+ "fsl,imx6dl";
+};
+
+/* Colibri MMC */
+&usdhc1 {
+ status = "okay";
+ /*
+ * Please make sure your carrier board does not pull-up any of
+ * the MMC/SD signals to 3.3 volt before attempting to activate
+ * UHS-I support.
+ * To let signaling voltage be changed to 1.8V, please
+ * delete no-1-8-v property (example below):
+ * /delete-property/no-1-8-v;
+ */
+};
diff --git a/arch/arm/boot/dts/imx6qdl-colibri-v1_1-uhs.dtsi b/arch/arm/boot/dts/imx6qdl-colibri-v1_1-uhs.dtsi
new file mode 100644
index 000000000000..7672fbfc29be
--- /dev/null
+++ b/arch/arm/boot/dts/imx6qdl-colibri-v1_1-uhs.dtsi
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright 2020 Toradex
+ */
+
+&iomuxc {
+ pinctrl_usdhc1_100mhz: usdhc1grp100mhz {
+ fsl,pins = <
+ MX6QDL_PAD_SD1_CMD__SD1_CMD 0x170b1
+ MX6QDL_PAD_SD1_CLK__SD1_CLK 0x100b1
+ MX6QDL_PAD_SD1_DAT0__SD1_DATA0 0x170b1
+ MX6QDL_PAD_SD1_DAT1__SD1_DATA1 0x170b1
+ MX6QDL_PAD_SD1_DAT2__SD1_DATA2 0x170b1
+ MX6QDL_PAD_SD1_DAT3__SD1_DATA3 0x170b1
+ >;
+ };
+
+ pinctrl_usdhc1_200mhz: usdhc1grp200mhz {
+ fsl,pins = <
+ MX6QDL_PAD_SD1_CMD__SD1_CMD 0x170f1
+ MX6QDL_PAD_SD1_CLK__SD1_CLK 0x100f1
+ MX6QDL_PAD_SD1_DAT0__SD1_DATA0 0x170f1
+ MX6QDL_PAD_SD1_DAT1__SD1_DATA1 0x170f1
+ MX6QDL_PAD_SD1_DAT2__SD1_DATA2 0x170f1
+ MX6QDL_PAD_SD1_DAT3__SD1_DATA3 0x170f1
+ >;
+ };
+};
+
+/* Colibri MMC */
+&usdhc1 {
+ pinctrl-names = "default", "state_100mhz", "state_200mhz";
+ pinctrl-0 = <&pinctrl_usdhc1 &pinctrl_mmc_cd>;
+ pinctrl-1 = <&pinctrl_usdhc1_100mhz &pinctrl_mmc_cd>;
+ pinctrl-2 = <&pinctrl_usdhc1_200mhz &pinctrl_mmc_cd>;
+ vmmc-supply = <&reg_module_3v3>;
+ vqmmc-supply = <&vgen3_reg>;
+ wakeup-source;
+ keep-power-in-suspend;
+ sd-uhs-sdr12;
+ sd-uhs-sdr25;
+ sd-uhs-sdr50;
+ sd-uhs-sdr104;
+};
diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index d03dff23863d..e85a41e84fd4 100644
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -229,7 +229,16 @@
regulator-always-on;
};

- /* vgen3: unused */
+ /*
+ * +V3.3_1.8_SD1 coming off VGEN3 and supplying
+ * the i.MX 6 NVCC_SD1.
+ */
+ vgen3_reg: vgen3 {
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };

vgen4_reg: vgen4 {
regulator-min-microvolt = <1800000>;
--
2.17.1
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