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Subject[PATCH v5 6/8] mtd: maps: gpio-addr-flash: Convert to gpiod
Date
Convert from legacy gpio API to gpiod.
Board files will have to use gpiod_lookup_tables.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
drivers/mtd/maps/gpio-addr-flash.c | 52 +++++++++++-------------------
1 file changed, 18 insertions(+), 34 deletions(-)

diff --git a/drivers/mtd/maps/gpio-addr-flash.c b/drivers/mtd/maps/gpio-addr-flash.c
index 47b12a6fead4..9e370e3158cd 100644
--- a/drivers/mtd/maps/gpio-addr-flash.c
+++ b/drivers/mtd/maps/gpio-addr-flash.c
@@ -14,6 +14,7 @@
*/

#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -33,16 +34,14 @@
* struct async_state - keep GPIO flash state
* @mtd: MTD state for this mapping
* @map: MTD map state for this flash
- * @gpio_count: number of GPIOs used to address
- * @gpio_addrs: array of GPIOs to twiddle
+ * @gpios: Struct containing the array of GPIO descriptors
* @gpio_values: cached GPIO values
* @win_order: dedicated memory size (if no GPIOs)
*/
struct async_state {
struct mtd_info *mtd;
struct map_info map;
- size_t gpio_count;
- unsigned *gpio_addrs;
+ struct gpio_descs *gpios;
unsigned int gpio_values;
unsigned int win_order;
};
@@ -66,11 +65,11 @@ static void gf_set_gpios(struct async_state *state, unsigned long ofs)
if (ofs == state->gpio_values)
return;

- for (i = 0; i < state->gpio_count; i++) {
+ for (i = 0; i < state->gpios->ndescs; i++) {
if ((ofs & BIT(i)) == (state->gpio_values & BIT(i)))
continue;

- gpio_set_value(state->gpio_addrs[i], !!(ofs & BIT(i)));
+ gpiod_set_value(state->gpios->desc[i], !!(ofs & BIT(i)));
}

state->gpio_values = ofs;
@@ -182,18 +181,19 @@ static const char * const part_probe_types[] = {
* The platform resource layout expected looks something like:
* struct mtd_partition partitions[] = { ... };
* struct physmap_flash_data flash_data = { ... };
- * unsigned flash_gpios[] = { GPIO_XX, GPIO_XX, ... };
+ * static struct gpiod_lookup_table addr_flash_gpios = {
+ * .dev_id = "gpio-addr-flash.0",
+ * .table = { .... );
+ * };
+ * gpiod_add_lookup_table(&addr_flash_gpios);
+ *
* struct resource flash_resource[] = {
* {
* .name = "cfi_probe",
* .start = 0x20000000,
* .end = 0x201fffff,
* .flags = IORESOURCE_MEM,
- * }, {
- * .start = (unsigned long)flash_gpios,
- * .end = ARRAY_SIZE(flash_gpios),
- * .flags = IORESOURCE_IRQ,
- * }
+ * },
* };
* struct platform_device flash_device = {
* .name = "gpio-addr-flash",
@@ -205,29 +205,24 @@ static const char * const part_probe_types[] = {
*/
static int gpio_flash_probe(struct platform_device *pdev)
{
- size_t i;
struct physmap_flash_data *pdata;
struct resource *memory;
- struct resource *gpios;
struct async_state *state;

pdata = dev_get_platdata(&pdev->dev);
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- gpios = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

- if (!memory || !gpios || !gpios->end)
+ if (!memory)
return -EINVAL;

state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;

- /*
- * We cast start/end to known types in the boards file, so cast
- * away their pointer types here to the known types (gpios->xxx).
- */
- state->gpio_count = gpios->end;
- state->gpio_addrs = (void *)(unsigned long)gpios->start;
+ state->gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
+ if (IS_ERR(state->gpios))
+ return PTR_ERR(state->gpios);
+
state->win_order = get_bitmask_order(resource_size(memory)) - 1;

state->map.name = DRIVER_NAME;
@@ -236,7 +231,7 @@ static int gpio_flash_probe(struct platform_device *pdev)
state->map.write = gf_write;
state->map.copy_to = gf_copy_to;
state->map.bankwidth = pdata->width;
- state->map.size = BIT(state->win_order + state->gpio_count);
+ state->map.size = BIT(state->win_order + state->gpios->ndescs);
state->map.virt = devm_ioremap_resource(&pdev->dev, memory);
if (IS_ERR(state->map.virt))
return PTR_ERR(state->map.virt);
@@ -246,17 +241,6 @@ static int gpio_flash_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, state);

- i = 0;
- do {
- if (devm_gpio_request(&pdev->dev, state->gpio_addrs[i],
- DRIVER_NAME)) {
- dev_err(&pdev->dev, "failed to request gpio %d\n",
- state->gpio_addrs[i]);
- return -EBUSY;
- }
- gpio_direction_output(state->gpio_addrs[i], 0);
- } while (++i < state->gpio_count);
-
dev_notice(&pdev->dev, "probing %d-bit flash bus\n",
state->map.bankwidth * 8);
state->mtd = do_map_probe(memory->name, &state->map);
--
2.19.0
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