linux-kernel - [PATCH v1 5/5] arm64: dts: exynos: exynos8895-dreamlte: enable support for microSD storage

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Message-ID: <20250102205846.223955-6-ivo.ivanov.ivanov1@gmail.com>
Date: Thu,  2 Jan 2025 22:58:46 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>
Cc: linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 5/5] arm64: dts: exynos: exynos8895-dreamlte: enable support for microSD storage

Enable MMC for the Samsung Galaxy S8, used as external microSD card
storage. Since the main PMIC is currently not supported, assume the
required regulators are enabled by the previous bootloader.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
---
 .../boot/dts/exynos/exynos8895-dreamlte.dts   | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos8895-dreamlte.dts b/arch/arm64/boot/dts/exynos/exynos8895-dreamlte.dts
index 3a376ab2b..11aed89a3 100644
--- a/arch/arm64/boot/dts/exynos/exynos8895-dreamlte.dts
+++ b/arch/arm64/boot/dts/exynos/exynos8895-dreamlte.dts
@@ -16,6 +16,10 @@ / {
 	compatible = "samsung,dreamlte", "samsung,exynos8895";
 	chassis-type = "handset";
 
+	aliases {
+		mmc0 = &mmc;
+	};
+
 	chosen {
 		#address-cells = <2>;
 		#size-cells = <1>;
@@ -89,12 +93,47 @@ wink-key {
 			wakeup-source;
 		};
 	};
+
+	reg_sd_vmmc: regulator-1 {
+		compatible = "regulator-fixed";
+		gpio = <&gpb1 1 GPIO_ACTIVE_HIGH>;
+		regulator-name = "sdcard-vmmc";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+		regulator-boot-on;
+		enable-active-high;
+	};
 };
 
 &oscclk {
 	clock-frequency = <26000000>;
 };
 
+&mmc {
+	assigned-clocks = <&cmu_top CLK_MOUT_CMU_FSYS1_MMC_CARD>;
+	assigned-clock-parents = <&cmu_top CLK_FOUT_SHARED4_PLL>;
+
+	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus1 &sd2_bus4>;
+	pinctrl-names = "default";
+
+	bus-width = <4>;
+	card-detect-delay = <200>;
+	cd-gpios = <&gpa1 5 GPIO_ACTIVE_LOW>;
+	clock-frequency = <50000000>;
+	disable-wp;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+
+	/* TODO: Update once PMIC is implemented */
+	vmmc-supply = <&reg_sd_vmmc>;
+
+	samsung,dw-mshc-ciu-div = <3>;
+	samsung,dw-mshc-ddr-timing = <1 2>;
+	samsung,dw-mshc-sdr-timing = <0 3>;
+
+	status = "okay";
+};
+
 &pinctrl_alive {
 	key_power: key-power-pins {
 		samsung,pins = "gpa2-4";
-- 
2.43.0