linux-kernel - [PATCH 1/2] dt-bindings: nand: meson: add Amlogic NAND controller driver

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Date:   Wed, 13 Jun 2018 16:13:13 +0000
From:   Yixun Lan <yixun.lan@...ogic.com>
To:     <linux-mtd@...ts.infradead.org>
CC:     Liang Yang <liang.yang@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>, Jian Hu <jian.hu@...ogic.com>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 1/2] dt-bindings: nand: meson: add Amlogic NAND controller driver

From: Liang Yang <liang.yang@...ogic.com>

Add Amlogic NAND controller dt-bindings for Meson SoC,
Current this driver support GXBB/GXL/AXG platform.

Signed-off-by: Liang Yang <liang.yang@...ogic.com>
Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
---
 .../bindings/mtd/amlogic,meson-nand.txt       | 118 ++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt

diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
new file mode 100644
index 000000000000..eac9f9433d5d
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
@@ -0,0 +1,118 @@
+Amlogic NAND Flash Controller (NFC) for GXBB/GXL/AXG family SoCs
+
+This file documents the properties in addition to those available in
+the MTD NAND bindings.
+
+Required properties:
+- compatible : contains one of:
+  - "amlogic,meson-gxl-nfc"
+  - "amlogic,meson-axg-nfc"
+- clocks     :
+	A list of phandle + clock-specifier pairs for the clocks listed
+	in clock-names.
+
+- clock-names: Should contain the following:
+	"core" - NFC module gate clock
+	"clkin0" - Parent clock of internal mux
+	"clkin1" - Other parent clock of internal mux
+
+- pins     : Select pins which NFC need.
+- nand_pins: Detail NAND pins information.
+		nand_pins: nand {
+			mux {
+				groups = "emmc_nand_d0",
+					"emmc_nand_d1",
+					"emmc_nand_d2",
+					"emmc_nand_d3",
+					"emmc_nand_d4",
+					"emmc_nand_d5",
+					"emmc_nand_d6",
+					"emmc_nand_d7",
+					"nand_ce0",
+					"nand_rb0",
+					"nand_ale",
+					"nand_cle",
+					"nand_wen_clk",
+					"nand_ren_wr";
+				function = "nand";
+			};
+		};
+
+- amlogic,mmc-syscon	: Required for NAND clocks, it's shared with SD/eMMC
+				controller port C
+
+Optional children nodes:
+Children nodes represent the available nand chips.
+
+Optional properties:
+- meson-nand-user-mode :
+	only set 2 or 16 which mean the way of reading OOB bytes by NFC.
+- meson-nand-ran-mode :
+	setting 0 or 1, means disable/enable scrambler which keeps the balence
+	of 0 and 1
+
+Other properties:
+see Documentation/devicetree/bindings/mtd/nand.txt for generic bindings.
+
+Example demonstrate on AXG SoC:
+
+	sd_emmc_c: mmc@...0 {
+		compatible = "simple-bus", "syscon";
+		reg = <0x0 0x7000 0x0 0x800>;
+		status = "okay";
+	};
+
+	nand: nfc@...0 {
+		compatible = "amlogic,meson-axg-nfc";
+		reg = <0x0 0x7800 0x0 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
+		status = "disabled";
+		clocks = <&clkc CLKID_SD_EMMC_C>,
+				<&clkc CLKID_SD_EMMC_C_CLK0>,
+				<&clkc CLKID_FCLK_DIV2>;
+		clock-names = "core", "clkin0", "clkin1";
+		amlogic,mmc-syscon = <&sd_mmc_c>;
+
+		status = "okay";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&nand_pins>;
+
+		nand@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			nand-on-flash-bbt;
+			nand-ecc-mode = "hw";
+			nand-ecc-strength = <8>;
+			nand-ecc-step-size = <1024>;
+
+			meson-nand-user-mode = <2>;
+			meson-nand-ran-mode = <1>;
+
+			partition@0 {
+				label = "boot";
+				reg = <0x00000000 0x00200000>;
+				read-only;
+			};
+			partition@...000 {
+				label = "env";
+				reg = <0x00200000 0x00400000>;
+			};
+			partition@...000 {
+				label = "system";
+				reg = <0x00600000 0x00a00000>;
+			};
+			partition@...0000 {
+				label = "rootfs";
+				reg = <0x01000000 0x03000000>;
+			};
+			partition@...0000 {
+				label = "media";
+				reg = <0x04000000 0x8000000>;
+			};
+		};
+	};
-- 
2.17.1