The default gpio.of_xlate function assumes there is one gpio chip
for each devicetree node. Device tree had changed to only use one node,
which corresponds to 3 different gpio chips now. For that approach
to work we need a custom xlate function.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
---
drivers/staging/mt7621-gpio/gpio-mt7621.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/staging/mt7621-gpio/gpio-mt7621.c b/drivers/staging/mt7621-gpio/gpio-mt7621.c
index 06024a3..ccf2aa8 100644
--- a/drivers/staging/mt7621-gpio/gpio-mt7621.c
+++ b/drivers/staging/mt7621-gpio/gpio-mt7621.c
@@ -206,6 +206,22 @@ static inline const char * const mediatek_gpio_bank_name(int bank)
}
static int
+mediatek_gpio_xlate(struct gpio_chip *chip,
+ const struct of_phandle_args *spec, u32 *flags)
+{
+ int gpio = spec->args[0];
+ struct mtk_gc *rg = to_mediatek_gpio(chip);
+
+ if (rg->bank != gpio / MTK_BANK_WIDTH)
+ return -EINVAL;
+
+ if (flags)
+ *flags = spec->args[1];
+
+ return gpio % MTK_BANK_WIDTH;
+}
+
+static int
mediatek_gpio_bank_probe(struct platform_device *pdev,
struct device_node *node, int bank)
{
@@ -220,6 +236,8 @@ mediatek_gpio_bank_probe(struct platform_device *pdev,
spin_lock_init(&rg->lock);
rg->chip.of_node = node;
rg->bank = bank;
+ rg->chip.of_gpio_n_cells = 2;
+ rg->chip.of_xlate = mediatek_gpio_xlate;
rg->chip.label = mediatek_gpio_bank_name(rg->bank);
dat = gpio->gpio_membase + GPIO_REG_DATA + (rg->bank * GPIO_BANK_WIDE);
--
2.7.4
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