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gpio: gpio-dwapb: add optional reset 

Some platforms require reset to be released to allow register
access.

Signed-off-by: Alan Tull <atull@kernel.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
[Added DT bindings oneliner for standard reset binding]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Alan Tull 2017-10-11 11:34:44 -05:00 committed by Linus Walleij
parent f76a2d9d7f
commit 07901a94f9
2 changed files with 10 additions and 0 deletions
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1
Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
View File

@ -29,6 +29,7 @@ controller.
- interrupts : The interrupt to the parent controller raised when GPIOs
generate the interrupts.
- snps,nr-gpios : The number of pins in the port, a single cell.
- resets : Reset line for the controller.
Example:

9
drivers/gpio/gpio-dwapb.c
View File

@ -25,6 +25,7 @@
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/reset.h>
#include <linux/spinlock.h>
#include <linux/platform_data/gpio-dwapb.h>
#include <linux/slab.h>
@ -98,6 +99,7 @@ struct dwapb_gpio {
unsigned int nr_ports;
struct irq_domain *domain;
unsigned int flags;
struct reset_control *rst;
};
static inline u32 gpio_reg_v2_convert(unsigned int offset)
@ -629,6 +631,12 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
gpio->dev = &pdev->dev;
gpio->nr_ports = pdata->nports;
gpio->rst = devm_reset_control_get_optional_shared(dev, NULL);
if (IS_ERR(gpio->rst))
return PTR_ERR(gpio->rst);
reset_control_deassert(gpio->rst);
gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
sizeof(*gpio->ports), GFP_KERNEL);
if (!gpio->ports)
@ -680,6 +688,7 @@ static int dwapb_gpio_remove(struct platform_device *pdev)
dwapb_gpio_unregister(gpio);
dwapb_irq_teardown(gpio);
reset_control_assert(gpio->rst);
return 0;
}