[PATCH 11/46] ARM: pxa: cmx270: use platform device for nand

Arnd Bergmann
2019-10-18T15:44:51Z

The driver traditionally hardcodes the MMIO register address and
the GPIO numbers from data defined in platform header files.

To make it indepdendent of that, use a memory resource for the
registers, and a gpio lookup table to replace the gpio numbers.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/arm/mach-pxa/cm-x270.c | 25 +++++++++
drivers/mtd/nand/raw/cmx270_nand.c | 88 +++++++++++-------------------
2 files changed, 56 insertions(+), 57 deletions(-)

diff --git a/arch/arm/mach-pxa/cm-x270.c b/arch/arm/mach-pxa/cm-x270.c
index 9baad11314f2..6d80400d8887 100644
--- a/arch/arm/mach-pxa/cm-x270.c
+++ b/arch/arm/mach-pxa/cm-x270.c
@@ -40,6 +40,10 @@
#define GPIO19_WLAN_STRAP (19)
#define GPIO102_WLAN_RST (102)

+/* NAND GPIOS */
+#define GPIO_NAND_CS (11)
+#define GPIO_NAND_RB (89)
+
static unsigned long cmx270_pin_config[] = {
/* AC'97 */
GPIO28_AC97_BITCLK,
@@ -403,6 +407,26 @@ static void __init cmx270_init_spi(void)
static inline void cmx270_init_spi(void) {}
#endif

+static struct gpiod_lookup_table cmx270_nand_gpio_table = {
+ .dev_id = "cmx270-nand",
+ .table = {
+ GPIO_LOOKUP("gpio-pxa", GPIO_NAND_CS, "cs", GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP("gpio-pxa", GPIO_NAND_RB, "rb", GPIO_ACTIVE_HIGH),
+ { },
+ },
+};
+
+static struct resource cmx270_nand_resources[] __initdata = {
+ DEFINE_RES_MEM(PXA_CS1_PHYS, 12),
+};
+
+static void __init cmx270_init_nand(void)
+{
+ platform_device_register_simple("cmx270-nand", -1,
+ cmx270_nand_resources, 1);
+ gpiod_add_lookup_table(&cmx270_nand_gpio_table);
+}
+
void __init cmx270_init(void)
{
pxa2xx_mfp_config(ARRAY_AND_SIZE(cmx270_pin_config));
@@ -416,4 +440,5 @@ void __init cmx270_init(void)
cmx270_init_ohci();
cmx270_init_2700G();
cmx270_init_spi();
+ cmx270_init_nand();
}
diff --git a/drivers/mtd/nand/raw/cmx270_nand.c b/drivers/mtd/nand/raw/cmx270_nand.c
index 7af3d0bdcdb8..31cb20858c46 100644
--- a/drivers/mtd/nand/raw/cmx270_nand.c
+++ b/drivers/mtd/nand/raw/cmx270_nand.c
@@ -15,18 +15,17 @@
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/soc/pxa/cpu.h>
+#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>

-#include <mach/addr-map.h>
-
-#define GPIO_NAND_CS (11)
-#define GPIO_NAND_RB (89)
+static struct gpio_desc *gpiod_nand_cs;
+static struct gpio_desc *gpiod_nand_rb;

/* MTD structure for CM-X270 board */
static struct mtd_info *cmx270_nand_mtd;
@@ -70,14 +69,14 @@ static void cmx270_read_buf(struct nand_chip *this, u_char *buf, int len)

static inline void nand_cs_on(void)
{
- gpio_set_value(GPIO_NAND_CS, 0);
+ gpiod_set_value(gpiod_nand_cs, 0);
}

static void nand_cs_off(void)
{
dsb();

- gpio_set_value(GPIO_NAND_CS, 1);
+ gpiod_set_value(gpiod_nand_cs, 1);
}

/*
@@ -120,48 +119,41 @@ static int cmx270_device_ready(struct nand_chip *this)
{
dsb();

- return (gpio_get_value(GPIO_NAND_RB));
+ return (gpiod_get_value(gpiod_nand_rb));
}

/*
* Main initialization routine
*/
-static int __init cmx270_init(void)
+static int cmx270_probe(struct platform_device *pdev)
{
struct nand_chip *this;
+ struct device *dev = &pdev->dev;
int ret;

- if (!(machine_is_armcore() && cpu_is_pxa27x()))
- return -ENODEV;
-
- ret = gpio_request(GPIO_NAND_CS, "NAND CS");
+ gpiod_nand_cs = devm_gpiod_get(dev, "cs", GPIOD_OUT_HIGH);
+ ret = PTR_ERR_OR_ZERO(gpiod_nand_cs);
if (ret) {
pr_warn("CM-X270: failed to request NAND CS gpio\n");
return ret;
}

- gpio_direction_output(GPIO_NAND_CS, 1);
-
- ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
+ gpiod_nand_rb = devm_gpiod_get(dev, "rb", GPIOD_IN);
+ ret = PTR_ERR_OR_ZERO(gpiod_nand_rb);
if (ret) {
pr_warn("CM-X270: failed to request NAND R/B gpio\n");
- goto err_gpio_request;
+ return ret;
}

- gpio_direction_input(GPIO_NAND_RB);
-
/* Allocate memory for MTD device structure and private data */
- this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
- if (!this) {
- ret = -ENOMEM;
- goto err_kzalloc;
- }
+ this = devm_kzalloc(dev, sizeof(struct nand_chip), GFP_KERNEL);
+ if (!this)
+ return -ENOMEM;

- cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
+ cmx270_nand_io = devm_platform_ioremap_resource(pdev, 0);
if (!cmx270_nand_io) {
pr_debug("Unable to ioremap NAND device\n");
- ret = -EINVAL;
- goto err_ioremap;
+ return -EINVAL;
}

cmx270_nand_mtd = nand_to_mtd(this);
@@ -189,48 +181,30 @@ static int __init cmx270_init(void)
ret = nand_scan(this, 1);
if (ret) {
pr_notice("No NAND device\n");
- goto err_scan;
+ return ret;
}

/* Register the partitions */
- ret = mtd_device_register(cmx270_nand_mtd, partition_info,
- NUM_PARTITIONS);
- if (ret)
- goto err_scan;
-
- /* Return happy */
- return 0;
-
-err_scan:
- iounmap(cmx270_nand_io);
-err_ioremap:
- kfree(this);
-err_kzalloc:
- gpio_free(GPIO_NAND_RB);
-err_gpio_request:
- gpio_free(GPIO_NAND_CS);
-
- return ret;
-
+ return mtd_device_register(cmx270_nand_mtd, partition_info,
+ NUM_PARTITIONS);
}
-module_init(cmx270_init);

/*
* Clean up routine
*/
-static void __exit cmx270_cleanup(void)
+static int cmx270_remove(struct platform_device *pdev)
{
- /* Release resources, unregister device */
nand_release(mtd_to_nand(cmx270_nand_mtd));

- gpio_free(GPIO_NAND_RB);
- gpio_free(GPIO_NAND_CS);
-
- iounmap(cmx270_nand_io);
-
- kfree(mtd_to_nand(cmx270_nand_mtd));
+ return 0;
}
-module_exit(cmx270_cleanup);
+
+static struct platform_driver cmx270_nand_driver = {
+ .driver.name = "cmx270-nand",
+ .probe = cmx270_probe,
+ .remove = cmx270_remove,
+};
+module_platform_driver(cmx270_nand_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
--
2.20.0