linux-kernel - [PATCH RESEND 10/14] gpio: amdpt: use new generic GPIO chip API

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Message-Id: <20250812-gpio-mmio-gpio-conv-v1-10-aac41d656979@linaro.org>
Date: Tue, 12 Aug 2025 14:12:52 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Yinbo Zhu <zhuyinbo@...ngson.cn>, 
 Hoan Tran <hoan@...amperecomputing.com>, 
 Manivannan Sadhasivam <mani@...nel.org>, Yang Shen <shenyang39@...wei.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-unisoc@...ts.infradead.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH RESEND 10/14] gpio: amdpt: use new generic GPIO chip API

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Convert the driver to using the new generic GPIO chip interfaces from
linux/gpio/generic.h.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-amdpt.c | 44 +++++++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/gpio/gpio-amdpt.c b/drivers/gpio/gpio-amdpt.c
index b70036587d9c3f64bb73ed3b94e1c14f249c9e21..0a9b870705b90bdc9bdab93ce5a4a33ebdafccc6 100644
--- a/drivers/gpio/gpio-amdpt.c
+++ b/drivers/gpio/gpio-amdpt.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/generic.h>
 #include <linux/spinlock.h>
 #include <linux/acpi.h>
 #include <linux/platform_device.h>
@@ -24,54 +25,50 @@
 #define PT_SYNC_REG        0x28
 
 struct pt_gpio_chip {
-	struct gpio_chip         gc;
+	struct gpio_generic_chip chip;
 	void __iomem             *reg_base;
 };
 
 static int pt_gpio_request(struct gpio_chip *gc, unsigned offset)
 {
+	struct gpio_generic_chip *gen_gc = to_gpio_generic_chip(gc);
 	struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
-	unsigned long flags;
 	u32 using_pins;
 
 	dev_dbg(gc->parent, "pt_gpio_request offset=%x\n", offset);
 
-	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+	guard(gpio_generic_lock_irqsave)(gen_gc);
 
 	using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
 	if (using_pins & BIT(offset)) {
 		dev_warn(gc->parent, "PT GPIO pin %x reconfigured\n",
 			 offset);
-		raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
 		return -EINVAL;
 	}
 
 	writel(using_pins | BIT(offset), pt_gpio->reg_base + PT_SYNC_REG);
 
-	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
-
 	return 0;
 }
 
 static void pt_gpio_free(struct gpio_chip *gc, unsigned offset)
 {
+	struct gpio_generic_chip *gen_gc = to_gpio_generic_chip(gc);
 	struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
-	unsigned long flags;
 	u32 using_pins;
 
-	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+	guard(gpio_generic_lock_irqsave)(gen_gc);
 
 	using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
 	using_pins &= ~BIT(offset);
 	writel(using_pins, pt_gpio->reg_base + PT_SYNC_REG);
 
-	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
-
 	dev_dbg(gc->parent, "pt_gpio_free offset=%x\n", offset);
 }
 
 static int pt_gpio_probe(struct platform_device *pdev)
 {
+	struct gpio_generic_chip_config config;
 	struct device *dev = &pdev->dev;
 	struct pt_gpio_chip *pt_gpio;
 	int ret = 0;
@@ -91,22 +88,27 @@ static int pt_gpio_probe(struct platform_device *pdev)
 		return PTR_ERR(pt_gpio->reg_base);
 	}
 
-	ret = bgpio_init(&pt_gpio->gc, dev, 4,
-			 pt_gpio->reg_base + PT_INPUTDATA_REG,
-			 pt_gpio->reg_base + PT_OUTPUTDATA_REG, NULL,
-			 pt_gpio->reg_base + PT_DIRECTION_REG, NULL,
-			 BGPIOF_READ_OUTPUT_REG_SET);
+	config = (typeof(config)){
+		.dev = dev,
+		.sz = 4,
+		.dat = pt_gpio->reg_base + PT_INPUTDATA_REG,
+		.set = pt_gpio->reg_base + PT_OUTPUTDATA_REG,
+		.dirout = pt_gpio->reg_base + PT_DIRECTION_REG,
+		.flags = BGPIOF_READ_OUTPUT_REG_SET,
+	};
+
+	ret = gpio_generic_chip_init(&pt_gpio->chip, &config);
 	if (ret) {
-		dev_err(dev, "bgpio_init failed\n");
+		dev_err(dev, "failed to initialize the generic GPIO chip\n");
 		return ret;
 	}
 
-	pt_gpio->gc.owner            = THIS_MODULE;
-	pt_gpio->gc.request          = pt_gpio_request;
-	pt_gpio->gc.free             = pt_gpio_free;
-	pt_gpio->gc.ngpio            = (uintptr_t)device_get_match_data(dev);
+	pt_gpio->chip.gc.owner = THIS_MODULE;
+	pt_gpio->chip.gc.request = pt_gpio_request;
+	pt_gpio->chip.gc.free = pt_gpio_free;
+	pt_gpio->chip.gc.ngpio = (uintptr_t)device_get_match_data(dev);
 
-	ret = devm_gpiochip_add_data(dev, &pt_gpio->gc, pt_gpio);
+	ret = devm_gpiochip_add_data(dev, &pt_gpio->chip.gc, pt_gpio);
 	if (ret) {
 		dev_err(dev, "Failed to register GPIO lib\n");
 		return ret;

-- 
2.48.1