[PATCH v4 6/8] mtd: maps: gpio-addr-flash: Convert to gpiod

[Ricardo Ribalda Delgado]

Convert from legacy gpio API to gpiod.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
Suggested-by: Boris Brezillon <boris.brezil...@bootlin.com>
---
 drivers/mtd/maps/gpio-addr-flash.c | 45 ++++++++++++++++++------------
 1 file changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/maps/gpio-addr-flash.c 
b/drivers/mtd/maps/gpio-addr-flash.c
index 47b12a6fead4..c6fe1de33a82 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;
@@ -222,12 +221,17 @@ static int gpio_flash_probe(struct platform_device *pdev)
        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_kzalloc(&pdev->dev,
+                       sizeof(*state->gpios) +
+                       gpios->end * sizeof(state->gpios->desc[0]),
+                       GFP_KERNEL);
+       if (!state->gpios)
+               return -ENOMEM;
+       state->gpios->ndescs = gpios->end;
+
+       if (!state->gpios->desc)
+               return -ENOMEM;
+
        state->win_order      = get_bitmask_order(resource_size(memory)) - 1;
 
        state->map.name       = DRIVER_NAME;
@@ -236,7 +240,7 @@ 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);
@@ -248,14 +252,19 @@ static int gpio_flash_probe(struct platform_device *pdev)
 
        i = 0;
        do {
-               if (devm_gpio_request(&pdev->dev, state->gpio_addrs[i],
-                                     DRIVER_NAME)) {
+               unsigned int *gpio_id = (unsigned int *)gpios->start;
+
+               if (devm_gpio_request_one(&pdev->dev, gpio_id[i], GPIOD_OUT_LOW,
+                                       DRIVER_NAME)) {
                        dev_err(&pdev->dev, "failed to request gpio %d\n",
-                               state->gpio_addrs[i]);
+                               gpio_id[i]);
                        return -EBUSY;
                }
-               gpio_direction_output(state->gpio_addrs[i], 0);
-       } while (++i < state->gpio_count);
+
+               state->gpios->desc[i] = gpio_to_desc(gpio_id[i]);
+               if (!state->gpios->desc[i])
+                       return -EINVAL;
+       } while (++i < state->gpios->ndescs);
 
        dev_notice(&pdev->dev, "probing %d-bit flash bus\n",
                   state->map.bankwidth * 8);
-- 
2.19.0