linux-kernel - [PATCH v3] MIPS: pci: lantiq: switch to using gpiod API

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Date:   Fri, 30 Sep 2022 08:57:18 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] MIPS: pci: lantiq: switch to using gpiod API

This patch switches the driver from legacy gpio API to the newer
gpiod API.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---

v3: fixed missing keyword struct, defined error temp variable
v2: actually compiles (proven to be a lie).

 arch/mips/pci/pci-lantiq.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/arch/mips/pci/pci-lantiq.c b/arch/mips/pci/pci-lantiq.c
index 1ca42f482130..8d16cd021f60 100644
--- a/arch/mips/pci/pci-lantiq.c
+++ b/arch/mips/pci/pci-lantiq.c
@@ -9,11 +9,11 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/clk.h>
 #include <linux/of_platform.h>
-#include <linux/of_gpio.h>
 #include <linux/of_irq.h>
 #include <linux/of_pci.h>
 
@@ -62,7 +62,7 @@
 __iomem void *ltq_pci_mapped_cfg;
 static __iomem void *ltq_pci_membase;
 
-static int reset_gpio;
+static struct gpio_desc *reset_gpio;
 static struct clk *clk_pci, *clk_external;
 static struct resource pci_io_resource;
 static struct resource pci_mem_resource;
@@ -95,6 +95,7 @@ static int ltq_pci_startup(struct platform_device *pdev)
 	struct device_node *node = pdev->dev.of_node;
 	const __be32 *req_mask, *bus_clk;
 	u32 temp_buffer;
+	int error;
 
 	/* get our clocks */
 	clk_pci = clk_get(&pdev->dev, NULL);
@@ -123,17 +124,14 @@ static int ltq_pci_startup(struct platform_device *pdev)
 		clk_disable(clk_external);
 
 	/* setup reset gpio used by pci */
-	reset_gpio = of_get_named_gpio(node, "gpio-reset", 0);
-	if (gpio_is_valid(reset_gpio)) {
-		int ret = devm_gpio_request(&pdev->dev,
-						reset_gpio, "pci-reset");
-		if (ret) {
-			dev_err(&pdev->dev,
-				"failed to request gpio %d\n", reset_gpio);
-			return ret;
-		}
-		gpio_direction_output(reset_gpio, 1);
+	reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
+					     GPIOD_OUT_LOW);
+	error = PTR_ERR_OR_ZERO(reset_gpio);
+	if (error) {
+		dev_err(&pdev->dev, "failed to request gpio: %d\n", error);
+		return error;
 	}
+	gpiod_set_consumer_name(reset_gpio, "pci_reset");
 
 	/* enable auto-switching between PCI and EBU */
 	ltq_pci_w32(0xa, PCI_CR_CLK_CTRL);
@@ -195,11 +193,11 @@ static int ltq_pci_startup(struct platform_device *pdev)
 	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_IEN) | 0x10, LTQ_EBU_PCC_IEN);
 
 	/* toggle reset pin */
-	if (gpio_is_valid(reset_gpio)) {
-		__gpio_set_value(reset_gpio, 0);
+	if (reset_gpio) {
+		gpiod_set_value_cansleep(reset_gpio, 1);
 		wmb();
 		mdelay(1);
-		__gpio_set_value(reset_gpio, 1);
+		gpiod_set_value_cansleep(reset_gpio, 0);
 	}
 	return 0;
 }
-- 
2.38.0.rc1.362.ged0d419d3c-goog


-- 
Dmitry