From: Laxman Dewangan <ldewangan@nvidia.com>
To: linus.walleij@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com,
mark.rutland@arm.com, mpa@pengutronix.de, swarren@wwwdotorg.org,
treding@nvidia.com
Cc: bparrot@ti.com, acourbot@nvidia.com, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Laxman Dewangan <ldewangan@nvidia.com>
Subject: [PATCH V2 5/5] gpio: of: Add support to have multiple gpios in gpio-hog
Date: Fri, 11 Mar 2016 19:13:24 +0530 [thread overview]
Message-ID: <1457703804-3016-6-git-send-email-ldewangan@nvidia.com> (raw)
In-Reply-To: <1457703804-3016-1-git-send-email-ldewangan@nvidia.com>
The child node for gpio hogs under gpio controller's node
provide the mechanism to automatic GPIO request and
configuration as part of the gpio-controller's driver
probe function.
Currently, property "gpio" takes one gpios for such
configuration. Add support to have multiple GPIOs in
this property so that multiple GPIOs of gpio-controller
can be configured by this mechanism with one child node.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Benoit Parrot <bparrot@ti.com>
Cc: Alexandre Courbot <acourbot@nvidia.com>
---
Changes from V1:
- Add "labels" property for GPIO label names.
---
drivers/gpio/gpiolib-of.c | 77 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 59 insertions(+), 18 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index d81dbd8..47a514d 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -118,6 +118,21 @@ int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
+static int of_gpio_get_gpio_cells_size(struct device_node *chip_np)
+{
+ u32 ncells;
+ int ret;
+
+ ret = of_property_read_u32(chip_np, "#gpio-cells", &ncells);
+ if (ret)
+ return ret;
+
+ if (ncells > MAX_PHANDLE_ARGS)
+ return -EINVAL;
+
+ return ncells;
+}
+
/**
* of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
* @np: device node to get GPIO from
@@ -131,6 +146,7 @@ EXPORT_SYMBOL(of_get_named_gpio_flags);
*/
static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
const char **name,
+ int gpio_index,
enum gpio_lookup_flags *lflags,
enum gpiod_flags *dflags)
{
@@ -139,8 +155,8 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
struct gg_data gg_data = {
.flags = &xlate_flags,
};
- u32 tmp;
- int i, ret;
+ int ncells;
+ int i, start_index, ret;
chip_np = np->parent;
if (!chip_np)
@@ -150,18 +166,17 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
*lflags = 0;
*dflags = 0;
- ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
- if (ret)
- return ERR_PTR(ret);
+ ncells = of_gpio_get_gpio_cells_size(chip_np);
+ if (ncells < 0)
+ return ERR_PTR(ncells);
- if (tmp > MAX_PHANDLE_ARGS)
- return ERR_PTR(-EINVAL);
+ start_index = ncells * gpio_index;
- gg_data.gpiospec.args_count = tmp;
+ gg_data.gpiospec.args_count = ncells;
gg_data.gpiospec.np = chip_np;
- for (i = 0; i < tmp; i++) {
- ret = of_property_read_u32_index(np, "gpios", i,
- &gg_data.gpiospec.args[i]);
+ for (i = 0; i < ncells; i++) {
+ ret = of_property_read_u32_index(np, "gpios", start_index + i,
+ &gg_data.gpiospec.args[i]);
if (ret)
return ERR_PTR(ret);
}
@@ -189,9 +204,16 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
return ERR_PTR(-EINVAL);
}
- if (name && of_property_read_string(np, "line-name", name))
- *name = np->name;
+ if (!name)
+ goto out;
+ ret = of_property_read_string(np, "line-name", name);
+ if (ret)
+ ret = of_property_read_string_index(np, "label", gpio_index,
+ name);
+ if (ret)
+ *name = np->name;
+out:
return gg_data.out_gpio;
}
@@ -211,18 +233,37 @@ static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
enum gpio_lookup_flags lflags;
enum gpiod_flags dflags;
int ret;
+ int i, ncells, ngpios;
+
+ ncells = of_gpio_get_gpio_cells_size(chip->of_node);
+ if (ncells < 0)
+ return 0;
for_each_available_child_of_node(chip->of_node, np) {
if (!of_property_read_bool(np, "gpio-hog"))
continue;
- desc = of_parse_own_gpio(np, &name, &lflags, &dflags);
- if (IS_ERR(desc))
+ ngpios = of_property_count_u32_elems(np, "gpios");
+ if (ngpios < 0)
continue;
- ret = gpiod_hog(desc, name, lflags, dflags);
- if (ret < 0)
- return ret;
+ if (ngpios % ncells) {
+ dev_warn(chip->parent, "Invalid GPIO entries at %s\n",
+ np->name);
+ continue;
+ }
+
+ ngpios /= ncells;
+ for (i = 0; i < ngpios; i++) {
+ desc = of_parse_own_gpio(np, &name, i,
+ &lflags, &dflags);
+ if (IS_ERR(desc))
+ continue;
+
+ ret = gpiod_hog(desc, name, lflags, dflags);
+ if (ret < 0)
+ return ret;
+ }
}
return 0;
--
2.1.4
next prev parent reply other threads:[~2016-03-11 13:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-11 13:43 [PATCH V2 0/5] gpio: of: Add error handling and support for multiple gpio in gpio-hog Laxman Dewangan
2016-03-11 13:43 ` [PATCH V2 1/5] gpio: of: Scan available child node for gpio-hog Laxman Dewangan
2016-03-15 14:09 ` Linus Walleij
[not found] ` <1457703804-3016-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-11 13:43 ` [PATCH V2 2/5] gpio: gpiolib: Print error number if gpio hog failed Laxman Dewangan
[not found] ` <1457703804-3016-3-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-15 14:11 ` Linus Walleij
2016-03-11 13:43 ` [PATCH V2 3/5] gpio: of: Return error if gpio hog configuration failed Laxman Dewangan
2016-03-15 14:12 ` Linus Walleij
[not found] ` <CACRpkdbsu+yfFvCR2=vKO3+S46+GHSy+3wu+5uwMmsu0_mfP-Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-16 11:10 ` Laxman Dewangan
[not found] ` <1457703804-3016-4-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-13 12:43 ` Linus Walleij
[not found] ` <CACRpkdbLKWDGvhqtwoogNNgQjG86g9HmpceLLVwKW+94dJk63A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-13 12:54 ` Laxman Dewangan
2016-04-14 12:52 ` Linus Walleij
2016-03-11 13:43 ` [PATCH V2 4/5] gpio: DT: Rephrase "gpios" of hog node to support multiple gpios Laxman Dewangan
[not found] ` <1457703804-3016-5-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-14 16:31 ` Stephen Warren
[not found] ` <56E6E753.1020505-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2016-03-15 6:37 ` Laxman Dewangan
[not found] ` <56E7ADA5.7000502-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-15 15:40 ` Stephen Warren
2016-03-15 14:16 ` Linus Walleij
2016-03-11 13:43 ` Laxman Dewangan [this message]
2016-03-15 14:21 ` [PATCH V2 5/5] gpio: of: Add support to have multiple gpios in gpio-hog Linus Walleij
[not found] ` <CACRpkdaoKeKAJX1mOD2v1rG_5ZVjAo66agoZrs6E606syUDLSQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-16 11:18 ` Laxman Dewangan
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