On 13/01/17 15:17, Boris Brezillon wrote:

On Fri, 13 Jan 2017 15:13:29 +0800
Guochun Mao [off-list ref] wrote:

quoted

Add Mediatek nor flash node.

Signed-off-by: Guochun Mao <redacted>
---
 arch/arm/boot/dts/mt2701-evb.dts |   25 +++++++++++++++++++++++++
 arch/arm/boot/dts/mt2701.dtsi    |   12 ++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/arch/arm/boot/dts/mt2701-evb.dts b/arch/arm/boot/dts/mt2701-evb.dts
index 082ca88..85e5ae8 100644
--- a/arch/arm/boot/dts/mt2701-evb.dts
+++ b/arch/arm/boot/dts/mt2701-evb.dts

@@ -24,6 +24,31 @@
 	};
 };

+&nor_flash {
+	pinctrl-names = "default";
+	pinctrl-0 = <&nor_pins_default>;
+	status = "okay";
+	flash at 0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+	};
+};
+
+&pio {
+	nor_pins_default: nor {
+		pins1 {
+			pinmux = <MT2701_PIN_240_EXT_XCS__FUNC_EXT_XCS>,
+				 <MT2701_PIN_241_EXT_SCK__FUNC_EXT_SCK>,
+				 <MT2701_PIN_239_EXT_SDIO0__FUNC_EXT_SDIO0>,
+				 <MT2701_PIN_238_EXT_SDIO1__FUNC_EXT_SDIO1>,
+				 <MT2701_PIN_237_EXT_SDIO2__FUNC_EXT_SDIO2>,
+				 <MT2701_PIN_236_EXT_SDIO3__FUNC_EXT_SDIO3>;
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up;
+		};
+	};
+};
+
 &uart0 {
 	status = "okay";
 };

diff --git a/arch/arm/boot/dts/mt2701.dtsi b/arch/arm/boot/dts/mt2701.dtsi
index bdf8954..1eefce4 100644
--- a/arch/arm/boot/dts/mt2701.dtsi
+++ b/arch/arm/boot/dts/mt2701.dtsi

@@ -227,6 +227,18 @@
 		status = "disabled";
 	};

+	nor_flash: spi at 11014000 {
+		compatible = "mediatek,mt2701-nor",
+			     "mediatek,mt8173-nor";

Why define both here? Is "mediatek,mt8173-nor" really providing a
subset of the features supported by "mediatek,mt2701-nor"?

I think even if the ip block is the same, we should provide both 
bindings, just in case in the future we find out that mt2701 has some 
hidden bug, feature or bug-feature. This way even if we update the 
driver, we stay compatible with older device tree blobs in the wild.

We can drop the mt2701-nor in the bindings definition if you want.

Regards,
Matthias

quoted

+		reg = <0 0x11014000 0 0xe0>;
+		clocks = <&pericfg CLK_PERI_FLASH>,
+			 <&topckgen CLK_TOP_FLASH_SEL>;
+		clock-names = "spi", "sf";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "disabled";
+	};
+
 	mmsys: syscon at 14000000 {
 		compatible = "mediatek,mt2701-mmsys", "syscon";
 		reg = <0 0x14000000 0 0x1000>;