Date: Tue, 05 Mar 2024 12:35:11 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: afd@...com, srk@...com, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Roger Quadros <rogerq@...nel.org>
Subject: [PATCH v4] arm64: dts: ti: am642-evm: Add overlay for NAND
 expansion card

The NAND expansion card plugs in over the HSE (High Speed Expansion)
connector. Add support for it.

We add the ranges property to the GPMC node instead of the NAND
overlay file to prevent below warnings.

/fragment@..._overlay__: Relying on default #address-cells value
/fragment@..._overlay__: Relying on default #size-cells value

As GPMC is dedicated for NAND use on this board, it should be OK.

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
Changelog:
v4:
- Rebased on ti-next/ti-k3-dt-for-v6.9

v3:
https://lore.kernel.org/all/20240123201312.23187-1-rogerq@kernel.org/
- Fix dtc warning by moving ranges property into the GPMC node
- update licence to GPL-2.0-only OR MIT and Copyright year to 2024
- don't drop k3-am642-evm.dtb target from Makefile

v2:
- Don't leave k3-am642-evm-nand.dtbo as an orphan. Make k3-am642-evm-nand.dtb
with the overlay applied on the base board.
---
 arch/arm64/boot/dts/ti/Makefile               |   2 +
 arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso | 139 ++++++++++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-am642-evm.dts       |   4 +
 3 files changed, 145 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 9a722c2473fb..8cceca6d6756 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -47,6 +47,8 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-icssg1-dualemac.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-pcie.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-usb3.dtb
+k3-am642-evm-nand-dtbs := k3-am642-evm.dtb k3-am642-evm-nand.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-nand.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-rdk.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl.dtb
diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso b/arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso
new file mode 100644
index 000000000000..3d1c2111ec88
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT overlay for HSE NAND expansion card on AM642 EVM
+ *
+ * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include "k3-pinctrl.h"
+
+&main_pmx0 {
+	gpmc0_pins_default: gpmc0-pins-default {
+		pinctrl-single,pins = <
+			AM64X_IOPAD(0x0094, PIN_INPUT, 7) /* (T19) GPMC0_BE1n.GPIO0_36 */
+
+			AM64X_IOPAD(0x003c, PIN_INPUT, 0) /* (T20) GPMC0_AD0 */
+			AM64X_IOPAD(0x0040, PIN_INPUT, 0) /* (U21) GPMC0_AD1 */
+			AM64X_IOPAD(0x0064, PIN_INPUT, 0) /* (R16) GPMC0_AD10 */
+			AM64X_IOPAD(0x0068, PIN_INPUT, 0) /* (W20) GPMC0_AD11 */
+			AM64X_IOPAD(0x006c, PIN_INPUT, 0) /* (W21) GPMC0_AD12 */
+			AM64X_IOPAD(0x0070, PIN_INPUT, 0) /* (V18) GPMC0_AD13 */
+			AM64X_IOPAD(0x0074, PIN_INPUT, 0) /* (Y21) GPMC0_AD14 */
+			AM64X_IOPAD(0x0078, PIN_INPUT, 0) /* (Y20) GPMC0_AD15 */
+			AM64X_IOPAD(0x0044, PIN_INPUT, 0) /* (T18) GPMC0_AD2 */
+			AM64X_IOPAD(0x0048, PIN_INPUT, 0) /* (U20) GPMC0_AD3 */
+			AM64X_IOPAD(0x004c, PIN_INPUT, 0) /* (U18) GPMC0_AD4 */
+			AM64X_IOPAD(0x0050, PIN_INPUT, 0) /* (U19) GPMC0_AD5 */
+			AM64X_IOPAD(0x0054, PIN_INPUT, 0) /* (V20) GPMC0_AD6 */
+			AM64X_IOPAD(0x0058, PIN_INPUT, 0) /* (V21) GPMC0_AD7 */
+			AM64X_IOPAD(0x005c, PIN_INPUT, 0) /* (V19) GPMC0_AD8 */
+			AM64X_IOPAD(0x0060, PIN_INPUT, 0) /* (T17) GPMC0_AD9 */
+			AM64X_IOPAD(0x0098, PIN_INPUT_PULLUP, 0) /* (W19) GPMC0_WAIT0 */
+			AM64X_IOPAD(0x009c, PIN_INPUT_PULLUP, 0) /* (Y18) GPMC0_WAIT1 */
+			AM64X_IOPAD(0x00a8, PIN_OUTPUT_PULLUP, 0) /* (R19) GPMC0_CSn0 */
+			AM64X_IOPAD(0x00ac, PIN_OUTPUT_PULLUP, 0) /* (R20) GPMC0_CSn1 */
+			AM64X_IOPAD(0x00b0, PIN_OUTPUT_PULLUP, 0) /* (P19) GPMC0_CSn2 */
+			AM64X_IOPAD(0x00b4, PIN_OUTPUT_PULLUP, 0) /* (R21) GPMC0_CSn3 */
+			AM64X_IOPAD(0x007c, PIN_OUTPUT, 0) /* (R17) GPMC0_CLK */
+			AM64X_IOPAD(0x0084, PIN_OUTPUT, 0) /* (P16) GPMC0_ADVn_ALE */
+			AM64X_IOPAD(0x0088, PIN_OUTPUT, 0) /* (R18) GPMC0_OEn_REn */
+			AM64X_IOPAD(0x008c, PIN_OUTPUT, 0) /* (T21) GPMC0_WEn */
+			AM64X_IOPAD(0x0090, PIN_OUTPUT, 0) /* (P17) GPMC0_BE0n_CLE */
+			AM64X_IOPAD(0x00a0, PIN_OUTPUT_PULLUP, 0) /* (N16) GPMC0_WPn */
+			AM64X_IOPAD(0x00a4, PIN_OUTPUT, 0) /* (N17) GPMC0_DIR */
+		>;
+	};
+};
+
+&main_gpio0 {
+	gpio0-36 {
+		gpio-hog;
+		gpios = <36 0>;
+		input;
+		line-name = "GPMC0_MUX_DIR";
+	};
+};
+
+&elm0 {
+	status = "okay";
+};
+
+&gpmc0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&gpmc0_pins_default>;
+	#address-cells = <2>;
+	#size-cells = <1>;
+
+	nand@0,0 {
+		compatible = "ti,am64-nand";
+		reg = <0 0 64>;		/* device IO registers */
+		interrupt-parent = <&gpmc0>;
+		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
+			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc0 0 GPIO_ACTIVE_HIGH>;	/* gpmc_wait0 */
+		ti,nand-xfer-type = "prefetch-polled";
+		ti,nand-ecc-opt = "bch8";	/* BCH8: Bootrom limitation */
+		ti,elm-id = <&elm0>;
+		nand-bus-width = <8>;
+		gpmc,device-width = <1>;
+		gpmc,sync-clk-ps = <0>;
+		gpmc,cs-on-ns = <0>;
+		gpmc,cs-rd-off-ns = <40>;
+		gpmc,cs-wr-off-ns = <40>;
+		gpmc,adv-on-ns = <0>;
+		gpmc,adv-rd-off-ns = <25>;
+		gpmc,adv-wr-off-ns = <25>;
+		gpmc,we-on-ns = <0>;
+		gpmc,we-off-ns = <20>;
+		gpmc,oe-on-ns = <3>;
+		gpmc,oe-off-ns = <30>;
+		gpmc,access-ns = <30>;
+		gpmc,rd-cycle-ns = <40>;
+		gpmc,wr-cycle-ns = <40>;
+		gpmc,bus-turnaround-ns = <0>;
+		gpmc,cycle2cycle-delay-ns = <0>;
+		gpmc,clk-activation-ns = <0>;
+		gpmc,wr-access-ns = <40>;
+		gpmc,wr-data-mux-bus-ns = <0>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "NAND.tiboot3";
+				reg = <0x00000000 0x00200000>;	/* 2M */
+			};
+			partition@...000 {
+				label = "NAND.tispl";
+				reg = <0x00200000 0x00200000>;	/* 2M */
+			};
+			partition@...000 {
+				label = "NAND.tiboot3.backup";	/* 2M */
+				reg = <0x00400000 0x00200000>;	/* BootROM looks at 4M */
+			};
+			partition@...000 {
+				label = "NAND.u-boot";
+				reg = <0x00600000 0x00400000>;	/* 4M */
+			};
+			partition@...000 {
+				label = "NAND.u-boot-env";
+				reg = <0x00a00000 0x00040000>;	/* 256K */
+			};
+			partition@...000 {
+				label = "NAND.u-boot-env.backup";
+				reg = <0x00a40000 0x00040000>;	/* 256K */
+			};
+			partition@...000 {
+				label = "NAND.file-system";
+				reg = <0x00a80000 0x3f580000>;
+			};
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index 53fe1d065ddb..44ac324fc7bb 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -818,3 +818,7 @@ icssg1_phy1: ethernet-phy@f {
 		rx-internal-delay-ps = <2000>;
 	};
 };
+
+&gpmc0 {
+	ranges = <0 0 0x00 0x51000000 0x01000000>; /* CS0 space. Min partition = 16MB */
+};

---
base-commit: bbef42084cc170cbfc035bf784f2ff055c939d7e
change-id: 20240305-for-v6-9-am642-evm-nand-bd7ad1f808e9

Best regards,
-- 
Roger Quadros <rogerq@...nel.org>

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