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Subject[PATCHv3 3/7] basic_mmio_gpio: allow overriding number of gpio
Date
Some platforms may have a number of GPIO that is less than the register
width of the peripheral.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
---
drivers/gpio/basic_mmio_gpio.c | 18 ++++++++++++------
include/linux/basic_mmio_gpio.h | 1 +
2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c
index 5db5de4..2b2d384 100644
--- a/drivers/gpio/basic_mmio_gpio.c
+++ b/drivers/gpio/basic_mmio_gpio.c
@@ -239,6 +239,7 @@ static int __devinit bgpio_probe(struct platform_device *pdev)
resource_size_t dat_sz;
int bits;
int ret;
+ int ngpio;

res_dat = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
if (!res_dat)
@@ -249,6 +250,7 @@ static int __devinit bgpio_probe(struct platform_device *pdev)
return -EINVAL;

bits = dat_sz * 8;
+ ngpio = bits;
if (bits > BITS_PER_LONG)
return -EINVAL;

@@ -277,13 +279,22 @@ static int __devinit bgpio_probe(struct platform_device *pdev)

spin_lock_init(&bgc->lock);

+ if (pdata) {
+ bgc->gc.base = pdata->base;
+ if (pdata->ngpio > 0)
+ ngpio = pdata->ngpio;
+ } else {
+ bgc->gc.base = -1;
+ }
+
bgc->bits = bits;
ret = bgpio_setup_accessors(pdev, bgc);
if (ret)
return ret;

bgc->data = bgc->read_reg(bgc->reg_dat);
- bgc->gc.ngpio = bits;
+
+ bgc->gc.ngpio = ngpio;
bgc->gc.direction_input = bgpio_dir_in;
bgc->gc.direction_output = bgpio_dir_out;
bgc->gc.get = bgpio_get;
@@ -291,11 +302,6 @@ static int __devinit bgpio_probe(struct platform_device *pdev)
bgc->gc.dev = dev;
bgc->gc.label = dev_name(dev);

- if (pdata)
- bgc->gc.base = pdata->base;
- else
- bgc->gc.base = -1;
-
platform_set_drvdata(pdev, bgc);

ret = gpiochip_add(&bgc->gc);
diff --git a/include/linux/basic_mmio_gpio.h b/include/linux/basic_mmio_gpio.h
index 198087a..f23ec73 100644
--- a/include/linux/basic_mmio_gpio.h
+++ b/include/linux/basic_mmio_gpio.h
@@ -15,6 +15,7 @@

struct bgpio_pdata {
int base;
+ int ngpio;
};

#endif /* __BASIC_MMIO_GPIO_H */
--
1.7.4.2


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