linux-kernel - [PATCH v4 3/3] riscv: dts: spacemit: add pinctrl property to uart0 in BPI-F3

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Message-Id: <20240903-02-k1-pinctrl-v4-3-d76c00a33b2b@gentoo.org>
Date: Tue, 03 Sep 2024 12:26:46 +0000
From: Yixun Lan <dlan@...too.org>
To: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Conor Dooley <conor@...nel.org>
Cc: Yangyu Chen <cyy@...self.name>, Jisheng Zhang <jszhang@...nel.org>, 
 Inochi Amaoto <inochiama@...look.com>, Icenowy Zheng <uwu@...nowy.me>, 
 Meng Zhang <zhangmeng.kevin@...cemit.com>, 
 Meng Zhang <kevin.z.m@...mail.com>, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, Yixun Lan <dlan@...too.org>
Subject: [PATCH v4 3/3] riscv: dts: spacemit: add pinctrl property to uart0
 in BPI-F3

Before pinctrl driver implemented, the uart0 controller reply on
bootloader for setting correct pin mux and configurations.

Now, let's add pinctrl property to uart0 of Bananapi-F3 board.

Signed-off-by: Yixun Lan <dlan@...too.org>
---
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts |  3 +++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi    | 20 ++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi            |  5 +++++
 3 files changed, 28 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
index 023274189b492..bc88d4de25a62 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -4,6 +4,7 @@
  */
 
 #include "k1.dtsi"
+#include "k1-pinctrl.dtsi"
 
 / {
 	model = "Banana Pi BPI-F3";
@@ -15,5 +16,7 @@ chosen {
 };
 
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_2_cfg>;
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
new file mode 100644
index 0000000000000..a8eac5517f857
--- /dev/null
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (c) 2024 Yixun Lan <dlan@...too.org>
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+#define K1_PADCONF(pin, func) (((pin) << 16) | (func))
+
+&pinctrl {
+	uart0_2_cfg: uart0-2-cfg {
+		uart0-2-pins {
+			pinmux = <K1_PADCONF(68, 2)>,
+				 <K1_PADCONF(69, 2)>;
+
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+};
diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index 0777bf9e01183..a2d5f7d4a942a 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -416,6 +416,11 @@ uart9: serial@...17800 {
 			status = "disabled";
 		};
 
+		pinctrl: pinctrl@...1e000 {
+			compatible = "spacemit,k1-pinctrl";
+			reg = <0x0 0xd401e000 0x0 0x400>;
+		};
+
 		plic: interrupt-controller@...00000 {
 			compatible = "spacemit,k1-plic", "sifive,plic-1.0.0";
 			reg = <0x0 0xe0000000 0x0 0x4000000>;

-- 
2.45.2