Date: Fri, 14 Jun 2024 18:06:42 +0300
From: Roger Quadros <rogerq@...nel.org>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.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 v5] 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:
v5:
- Rebased on ti-next/ti-k3-dts-next

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 d956372a7163..f5ff9ef6d70c 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -49,6 +49,8 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-icssg1-dualemac-mii.dtbo
 dtb-$(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-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-gpio-fan.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.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 e20e4ffd0f1f..9f691ed97791 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -817,3 +817,7 @@ icssg1_phy1: ethernet-phy@f {
 		rx-internal-delay-ps = <2000>;
 	};
 };
+
+&gpmc0 {
+	ranges = <0 0 0x00 0x51000000 0x01000000>; /* CS0 space. Min partition = 16MB */
+};

---
base-commit: 2f79e7408ac1b22ce8abc4a22b92793a57a3077d
change-id: 20240614-am642-evm-nand-5fb23a284d57

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

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