linux-kernel - [PATCH 3/3] ARM: dts: r8a7742-iwg21m: Add SPI NOR support

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Date:   Sun, 16 Aug 2020 20:33:16 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: [PATCH 3/3] ARM: dts: r8a7742-iwg21m: Add SPI NOR support

Add support for the SPI NOR device used to boot up the system
to the System on Module DT.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@...esas.com>
---
 arch/arm/boot/dts/r8a7742-iwg21m.dtsi | 34 +++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7742-iwg21m.dtsi b/arch/arm/boot/dts/r8a7742-iwg21m.dtsi
index 0f26807f92b8..db8301331d31 100644
--- a/arch/arm/boot/dts/r8a7742-iwg21m.dtsi
+++ b/arch/arm/boot/dts/r8a7742-iwg21m.dtsi
@@ -35,6 +35,16 @@
 	clock-frequency = <20000000>;
 };
 
+&gpio0 {
+	/* GP0_18 set low to select QSPI. Doing so will disable VIN2 */
+	qspi_en {
+		gpio-hog;
+		gpios = <18 GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "QSPI_EN";
+	};
+};
+
 &i2c0 {
 	pinctrl-0 = <&i2c0_pins>;
 	pinctrl-names = "default";
@@ -70,4 +80,28 @@
 		groups = "mmc1_data4", "mmc1_ctrl";
 		function = "mmc1";
 	};
+
+	qspi_pins: qspi {
+		groups = "qspi_ctrl", "qspi_data2";
+		function = "qspi";
+	};
+};
+
+&qspi {
+	pinctrl-0 = <&qspi_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+
+	/* WARNING - This device contains the bootloader. Handle with care. */
+	flash: flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "sst,sst25vf016b", "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+		spi-cpol;
+		spi-cpha;
+	};
 };
-- 
2.17.1