forked from mirrors/linux
gpio: Adjust of_xlate API to support multiple GPIO chips
This patch changes the of_xlate API to make it possible for multiple gpio_chips to refer to the same device tree node. This is useful for banked GPIO controllers that use multiple gpio_chips for a single device. With this change the core code will try calling of_xlate on each gpio_chip that references the device_node and will return the gpio number for the first one to return 'true'. Tested-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
parent
09d71ff194
commit
3d0f7cf0f3
5 changed files with 43 additions and 49 deletions
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@ -96,8 +96,7 @@ static struct i2c_board_info __initdata i2c_devices_3ds[] = {
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static int lcd_power_gpio = -ENXIO;
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static int mc9s08dz60_gpiochip_match(struct gpio_chip *chip,
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const void *data)
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static int mc9s08dz60_gpiochip_match(struct gpio_chip *chip, void *data)
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{
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return !strcmp(chip->label, data);
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}
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@ -15,11 +15,39 @@
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.h>
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/* Private data structure for of_gpiochip_is_match */
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struct gg_data {
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enum of_gpio_flags *flags;
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struct of_phandle_args gpiospec;
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int out_gpio;
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};
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/* Private function for resolving node pointer to gpio_chip */
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static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
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{
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struct gg_data *gg_data = data;
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int ret;
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if ((gc->of_node != gg_data->gpiospec.np) ||
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(gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
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(!gc->of_xlate))
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return false;
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ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
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if (ret < 0)
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return false;
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gg_data->out_gpio = ret + gc->base;
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return true;
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}
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/**
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* of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
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* @np: device node to get GPIO from
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@ -34,46 +62,25 @@
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int of_get_named_gpio_flags(struct device_node *np, const char *propname,
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int index, enum of_gpio_flags *flags)
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{
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struct gg_data gg_data = { .flags = flags, .out_gpio = -ENODEV };
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int ret;
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struct gpio_chip *gc;
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struct of_phandle_args gpiospec;
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ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
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&gpiospec);
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if (ret) {
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pr_debug("%s: can't parse gpios property\n", __func__);
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goto err0;
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}
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gc = of_node_to_gpiochip(gpiospec.np);
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if (!gc) {
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pr_debug("%s: gpio controller %s isn't registered\n",
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np->full_name, gpiospec.np->full_name);
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ret = -ENODEV;
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goto err1;
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}
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if (gpiospec.args_count != gc->of_gpio_n_cells) {
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pr_debug("%s: wrong #gpio-cells for %s\n",
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np->full_name, gpiospec.np->full_name);
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ret = -EINVAL;
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goto err1;
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}
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/* .xlate might decide to not fill in the flags, so clear it. */
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/* .of_xlate might decide to not fill in the flags, so clear it. */
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if (flags)
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*flags = 0;
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ret = gc->of_xlate(gc, &gpiospec, flags);
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if (ret < 0)
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goto err1;
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ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
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&gg_data.gpiospec);
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if (ret) {
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pr_debug("%s: can't parse gpios property\n", __func__);
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return -EINVAL;
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}
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ret += gc->base;
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err1:
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of_node_put(gpiospec.np);
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err0:
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gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
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of_node_put(gg_data.gpiospec.np);
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pr_debug("%s exited with status %d\n", __func__, ret);
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return ret;
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return gg_data.out_gpio;
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}
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EXPORT_SYMBOL(of_get_named_gpio_flags);
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@ -227,14 +234,3 @@ void of_gpiochip_remove(struct gpio_chip *chip)
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if (chip->of_node)
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of_node_put(chip->of_node);
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}
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/* Private function for resolving node pointer to gpio_chip */
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static int of_gpiochip_is_match(struct gpio_chip *chip, const void *data)
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{
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return chip->of_node == data;
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}
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struct gpio_chip *of_node_to_gpiochip(struct device_node *np)
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{
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return gpiochip_find(np, of_gpiochip_is_match);
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}
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@ -1156,7 +1156,7 @@ EXPORT_SYMBOL_GPL(gpiochip_remove);
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*/
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struct gpio_chip *gpiochip_find(const void *data,
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int (*match)(struct gpio_chip *chip,
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const void *data))
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void *data))
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{
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struct gpio_chip *chip = NULL;
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unsigned long flags;
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@ -144,7 +144,7 @@ extern int gpiochip_add(struct gpio_chip *chip);
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extern int __must_check gpiochip_remove(struct gpio_chip *chip);
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extern struct gpio_chip *gpiochip_find(const void *data,
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int (*match)(struct gpio_chip *chip,
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const void *data));
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void *data));
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/* Always use the library code for GPIO management calls,
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@ -58,7 +58,6 @@ extern int of_mm_gpiochip_add(struct device_node *np,
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extern void of_gpiochip_add(struct gpio_chip *gc);
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extern void of_gpiochip_remove(struct gpio_chip *gc);
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extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
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extern int of_gpio_simple_xlate(struct gpio_chip *gc,
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const struct of_phandle_args *gpiospec,
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u32 *flags);
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