| Message ID | 1437125570-28623-7-git-send-email-mpa@pengutronix.de |
|---|---|
| State | New |
| Headers | show |
On Fri, Jul 17, 2015 at 11:32:47AM +0200, Markus Pargmann wrote: > The DT describes gpios with subnodes. These subnodes can contain a > property 'line-name'. This information can be useful in other areas > where we want to identify a GPIO by its name. > > This patch stores the line-name in the gpio descriptor. > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> > --- > drivers/gpio/gpiolib-of.c | 29 ++++++++++++++++++++--------- > 1 file changed, 20 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c > index 64950591a764..cefc665a558c 100644 > --- a/drivers/gpio/gpiolib-of.c > +++ b/drivers/gpio/gpiolib-of.c > @@ -184,11 +184,6 @@ static struct gpio_desc *of_parse_gpio(struct device_node *np, > *dflags |= GPIOD_OUT_LOW; > else if (of_property_read_bool(np, "output-high")) > *dflags |= GPIOD_OUT_HIGH; > - else { > - pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", > - desc_to_gpio(gg_data.out_gpio), np->name); > - return ERR_PTR(-EINVAL); > - } > > if (name && of_property_read_string(np, "line-name", name)) > *name = np->name; > @@ -214,15 +209,31 @@ static void of_gpiochip_scan_gpios(struct gpio_chip *chip) > > for_each_child_of_node(chip->of_node, np) { > const char *name = NULL; > - if (!of_property_read_bool(np, "gpio-hog")) > - continue; > + struct gpio_desc *name_desc; > > desc = of_parse_gpio(np, &name, &lflags, &dflags); > if (IS_ERR(desc)) > continue; > > - if (gpiod_hog(desc, name, lflags, dflags)) > - continue; > + if (name) { > + name_desc = gpio_name_to_desc(name); > + if (name_desc) > + pr_err("GPIO name collision for '%s' detected at GPIO line %d (%s)\n", > + name, desc_to_gpio(desc), np->name); > + else > + desc->name = name; This will introduce a regression. As I mentioned in a comment on an earlier patch, of_get_gpio_hog falls back to using the node name and those need not be unique. Johan -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Jul 28, 2015 at 11:31:05AM +0200, Johan Hovold wrote: > On Fri, Jul 17, 2015 at 11:32:47AM +0200, Markus Pargmann wrote: > > The DT describes gpios with subnodes. These subnodes can contain a > > property 'line-name'. This information can be useful in other areas > > where we want to identify a GPIO by its name. > > > > This patch stores the line-name in the gpio descriptor. > > > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> > > --- > > drivers/gpio/gpiolib-of.c | 29 ++++++++++++++++++++--------- > > 1 file changed, 20 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c > > index 64950591a764..cefc665a558c 100644 > > --- a/drivers/gpio/gpiolib-of.c > > +++ b/drivers/gpio/gpiolib-of.c > > @@ -184,11 +184,6 @@ static struct gpio_desc *of_parse_gpio(struct device_node *np, > > *dflags |= GPIOD_OUT_LOW; > > else if (of_property_read_bool(np, "output-high")) > > *dflags |= GPIOD_OUT_HIGH; > > - else { > > - pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", > > - desc_to_gpio(gg_data.out_gpio), np->name); > > - return ERR_PTR(-EINVAL); > > - } > > > > if (name && of_property_read_string(np, "line-name", name)) > > *name = np->name; > > @@ -214,15 +209,31 @@ static void of_gpiochip_scan_gpios(struct gpio_chip *chip) > > > > for_each_child_of_node(chip->of_node, np) { > > const char *name = NULL; > > - if (!of_property_read_bool(np, "gpio-hog")) > > - continue; > > + struct gpio_desc *name_desc; > > > > desc = of_parse_gpio(np, &name, &lflags, &dflags); > > if (IS_ERR(desc)) > > continue; > > > > - if (gpiod_hog(desc, name, lflags, dflags)) > > - continue; > > + if (name) { > > + name_desc = gpio_name_to_desc(name); > > + if (name_desc) > > + pr_err("GPIO name collision for '%s' detected at GPIO line %d (%s)\n", > > + name, desc_to_gpio(desc), np->name); > > + else > > + desc->name = name; > > This will introduce a regression. As I mentioned in a comment on an > earlier patch, of_get_gpio_hog falls back to using the node name and > those need not be unique. Yes, will fix this as well. Thanks, Markus > > Johan >
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 64950591a764..cefc665a558c 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -184,11 +184,6 @@ static struct gpio_desc *of_parse_gpio(struct device_node *np, *dflags |= GPIOD_OUT_LOW; else if (of_property_read_bool(np, "output-high")) *dflags |= GPIOD_OUT_HIGH; - else { - pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", - desc_to_gpio(gg_data.out_gpio), np->name); - return ERR_PTR(-EINVAL); - } if (name && of_property_read_string(np, "line-name", name)) *name = np->name; @@ -214,15 +209,31 @@ static void of_gpiochip_scan_gpios(struct gpio_chip *chip) for_each_child_of_node(chip->of_node, np) { const char *name = NULL; - if (!of_property_read_bool(np, "gpio-hog")) - continue; + struct gpio_desc *name_desc; desc = of_parse_gpio(np, &name, &lflags, &dflags); if (IS_ERR(desc)) continue; - if (gpiod_hog(desc, name, lflags, dflags)) - continue; + if (name) { + name_desc = gpio_name_to_desc(name); + if (name_desc) + pr_err("GPIO name collision for '%s' detected at GPIO line %d (%s)\n", + name, desc_to_gpio(desc), np->name); + else + desc->name = name; + } + + if (of_property_read_bool(np, "gpio-hog")) { + if (!dflags) { + pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", + desc_to_gpio(desc), np->name); + continue; + } + + if (gpiod_hog(desc, name, lflags, dflags)) + continue; + } } }
The DT describes gpios with subnodes. These subnodes can contain a property 'line-name'. This information can be useful in other areas where we want to identify a GPIO by its name. This patch stores the line-name in the gpio descriptor. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> --- drivers/gpio/gpiolib-of.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-)