[参考译文] TDA4VM：a72使用 wkup_GPIO 中断问题

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1495987/tda4vm-a72-use-wkup_gpio-interrupt-problem

工具/软件：

你(们)好

在 SDK 10中、我们希望使用 E27作为中断端口。

所以我修改了代码  

From 967005c5ab27b8a757fd713f4d6462495314ef83 Mon Sep 17 00:00:00 2001
From: Keerthy <j-keerthy@ti.com>
Date: Thu, 11 Nov 2021 20:39:59 +0530
Subject: [PATCH] davinci_gpio: Test interrupts

This specifically tries out wkup_gpio52

Signed-off-by: Keerthy <j-keerthy@ti.com>
---
 .../dts/ti/k3-j721e-common-proc-board.dts     | 17 ++++++++
 drivers/gpio/gpio-davinci.c                   | 41 +++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
index c0d32b806..9079f82e3 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
@@ -93,6 +93,12 @@
 			 <3300000 0x1>;
 	};
 
+	gpio_test: gpio_test {
+		compatible = "ti,gpio_test";
+		interrupt-parent = <&wkup_gpio0>;
+		interrupts = <52 IRQ_TYPE_EDGE_BOTH>;
+	};
+
 	sound0: sound@0 {
 		compatible = "ti,j721e-cpb-audio";
 		model = "j721e-cpb";
@@ -301,6 +307,12 @@
 		>;
 	};
 
+	test_key_pins_default: test-key-pins-default {
+		pinctrl-single,pins = <
+			J721E_WKUP_IOPAD(0x90, PIN_INPUT, 7) /* (E27) WKUP_GPIO0_52 */
+		>;
+	};
+
 	mcu_fss0_ospi1_pins_default: mcu-fss0-ospi1-pins-default {
 		pinctrl-single,pins = <
 			J721E_WKUP_IOPAD(0x34, PIN_OUTPUT, 0) /* (F22) MCU_OSPI1_CLK */
@@ -433,6 +445,11 @@
 	status = "disabled";
 };
 
+&wkup_gpio0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&test_key_pins_default>;
+};
+
 &main_sdhci0 {
 	/* eMMC */
 	non-removable;
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 6f2138503..9c71df4fa 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -23,8 +23,15 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/spinlock.h>
 
+
 #include <asm-generic/gpio.h>
 
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+
+int gpio_test_init(void);
+ 
 #define MAX_REGS_BANKS 5
 #define MAX_INT_PER_BANK 32
 
@@ -187,6 +194,35 @@ davinci_gpio_get_pdata(struct platform_device *pdev)
 	return NULL;
 }
 
+static irqreturn_t test_irq(int irq, void *data)
+{
+	pr_info("%s: irq %d, val=%d\n", __func__, irq,
+		gpio_get_value(432));
+	return IRQ_HANDLED;
+}
+
+int gpio_test_init(void)
+{
+	struct device_node *np;
+	int irq;
+	int ret = 0;
+
+	np = of_find_node_by_name(NULL, "gpio_test");
+
+	if (np) {
+		pr_info("Initializing gpio test\n");
+		irq = irq_of_parse_and_map(np, 0);
+		printk("irq number is %d\n", irq);
+		ret = request_irq(irq, test_irq, //IRQF_TRIGGER_RISING,
+				  IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+				  "key-gpio", NULL);
+		if (ret)
+			pr_err("request_irq returns %d\n", ret);
+	}
+
+	return ret;
+}
+
 static int davinci_gpio_probe(struct platform_device *pdev)
 {
 	int bank, i, ret = 0;
@@ -195,6 +231,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	struct davinci_gpio_platform_data *pdata;
 	struct device *dev = &pdev->dev;
 
+	printk("Name of gpio dev is %s\n", pdev->name);
 	pdata = davinci_gpio_get_pdata(pdev);
 	if (!pdata) {
 		dev_err(dev, "No platform data found\n");
@@ -273,6 +310,10 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (!strcmp("42110000.gpio", pdev->name)) {
+		gpio_test_init();
+	}
+
 	return 0;
 }
 
-- 
2.17.1

但这是不起作用的

日志为：

[1.399969]##### GPIO DEV 的名称是42110000.gpio
[ 1.404119] mmc0：使用 ADMA 64位的4f80000.mmc [4f80000.mmc]上的 SDHCI 控制器
[ 1.404865] mmc1：使用 ADMA 64位的4fb0000.mmc [4fb0000.MMC]上的 SDHCI 控制器
[ 1.419787] DaVinci _GPIO 42110000。GPIO：错误-ENXIO：未找到 IRQ 索引0

BR

中断