linux-kernel - [PATCH] arm64: dts: ti: k3-am62a7-sk: Add interrupt support for IO Expander

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Date:   Thu, 9 Nov 2023 00:46:52 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
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:     Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Devarsh Thakkar <devarsht@...com>,
        Jai Luthra <j-luthra@...com>, Aradhya Bhatia <a-bhatia1@...com>
Subject: [PATCH] arm64: dts: ti: k3-am62a7-sk: Add interrupt support for IO Expander

The Hot Plug Detect (HPD) signal for the HDMI display travels from the
on-board HDMI connector, through the IO Expander 1, and finally to the
main_gpio1 line #23, of the SoC.

Add interrupt information for the IO Expander 1 (exp1).
Also add pinmux info of main gpio 1, line #23.

Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---

Notes:

  - HDMI display on AM62A7 is not in the mainline yet. All the patches,
    including this one, required to enable HDMI display and HPD on
    AM62A7 SK-EVM, can be found on my github fork in the branch
    "next_am62a-v3"[0].

[0]: https://github.com/aradhya07/linux-ab/tree/next_am62a-v3

 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
index 8f64ac2c7568..560dad02ef62 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
@@ -274,6 +274,12 @@ AM62AX_IOPAD(0x08c, PIN_OUTPUT, 2) /* (K19) GPMC0_WEn.MCASP1_AXR0 */
 			AM62AX_IOPAD(0x084, PIN_INPUT, 2) /* (L18) GPMC0_ADVn_ALE.MCASP1_AXR2 */
 		>;
 	};
+
+	main_gpio1_ioexp_intr_pins_default: main-gpio1-ioexp-intr-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_IOPAD(0x01d4, PIN_INPUT, 7) /* (C15) UART0_RTSn.GPIO1_23 */
+		>;
+	};
 };
 
 &mcu_pmx0 {
@@ -407,6 +413,12 @@ exp1: gpio@22 {
 		reg = <0x22>;
 		gpio-controller;
 		#gpio-cells = <2>;
+		interrupt-parent = <&main_gpio1>;
+		interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&main_gpio1_ioexp_intr_pins_default>;
 
 		gpio-line-names = "GPIO_CPSW2_RST", "GPIO_CPSW1_RST",
 				   "BT_EN_SOC", "MMC1_SD_EN",

base-commit: 2220f68f4504aa1ccce0fac721ccdb301e9da32f
-- 
2.42.0