linux-kernel - [PATCH v3 11/14] mtd: nand: jz4740: Let the pinctrl driver configure the pins

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Date:   Wed, 25 Jan 2017 19:52:04 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        james.hogan@...tec.com, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v3 11/14] mtd: nand: jz4740: Let the pinctrl driver configure the pins

Before, this NAND driver would set itself the configuration of the
chip-select pins for the various NAND banks.

Now that the JZ4740 and similar SoCs have a pinctrl driver, we rely on
the pins being properly configured before the driver probes.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/mtd/nand/jz4740_nand.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

v2: No changes
v3: No changes

diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index 5551c36adbdf..0d06a1f07d82 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -25,7 +25,6 @@
 
 #include <linux/gpio.h>
 
-#include <asm/mach-jz4740/gpio.h>
 #include <asm/mach-jz4740/jz4740_nand.h>
 
 #define JZ_REG_NAND_CTRL	0x50
@@ -310,34 +309,20 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 			       uint8_t *nand_dev_id)
 {
 	int ret;
-	int gpio;
-	char gpio_name[9];
 	char res_name[6];
 	uint32_t ctrl;
 	struct nand_chip *chip = &nand->chip;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
-	/* Request GPIO port. */
-	gpio = JZ_GPIO_MEM_CS0 + bank - 1;
-	sprintf(gpio_name, "NAND CS%d", bank);
-	ret = gpio_request(gpio, gpio_name);
-	if (ret) {
-		dev_warn(&pdev->dev,
-			"Failed to request %s gpio %d: %d\n",
-			gpio_name, gpio, ret);
-		goto notfound_gpio;
-	}
-
 	/* Request I/O resource. */
 	sprintf(res_name, "bank%d", bank);
 	ret = jz_nand_ioremap_resource(pdev, res_name,
 					&nand->bank_mem[bank - 1],
 					&nand->bank_base[bank - 1]);
 	if (ret)
-		goto notfound_resource;
+		return ret;
 
 	/* Enable chip in bank. */
-	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_MEM_CS0);
 	ctrl = readl(nand->base + JZ_REG_NAND_CTRL);
 	ctrl |= JZ_NAND_CTRL_ENABLE_CHIP(bank - 1);
 	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
@@ -377,12 +362,8 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 	dev_info(&pdev->dev, "No chip found on bank %i\n", bank);
 	ctrl &= ~(JZ_NAND_CTRL_ENABLE_CHIP(bank - 1));
 	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
-	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE);
 	jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
 				 nand->bank_base[bank - 1]);
-notfound_resource:
-	gpio_free(gpio);
-notfound_gpio:
 	return ret;
 }
 
@@ -503,7 +484,6 @@ static int jz_nand_probe(struct platform_device *pdev)
 err_unclaim_banks:
 	while (chipnr--) {
 		unsigned char bank = nand->banks[chipnr];
-		gpio_free(JZ_GPIO_MEM_CS0 + bank - 1);
 		jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
 					 nand->bank_base[bank - 1]);
 	}
@@ -530,7 +510,6 @@ static int jz_nand_remove(struct platform_device *pdev)
 		if (bank != 0) {
 			jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
 						 nand->bank_base[bank - 1]);
-			gpio_free(JZ_GPIO_MEM_CS0 + bank - 1);
 		}
 	}
 
-- 
2.11.0