gpio: sifive: use the correct register to read output values

Setting the output of a GPIO to 1 using gpiod_set_value(), followed by
reading the same GPIO using gpiod_get_value(), will currently yield an
incorrect result.

This is because the SiFive GPIO device stores the output values in reg_set,
not reg_dat.

Supply the flag BGPIOF_READ_OUTPUT_REG_SET to bgpio_init() so that the
generic driver reads the correct register.

Fixes: 96868dce644d ("gpio/sifive: Add GPIO driver for SiFive SoCs")
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
[Bartosz: added the Fixes tag]
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index 403f9e833d6a3509ae25ebc0a595c32dc6a48cac..7d82388b4ab7c4bde29f81d4d23da99f241d1991 100644 (file)
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -223,7 +223,7 @@ static int sifive_gpio_probe(struct platform_device *pdev)
                         NULL,
                         chip->base + SIFIVE_GPIO_OUTPUT_EN,
                         chip->base + SIFIVE_GPIO_INPUT_EN,
-                        0);
+                        BGPIOF_READ_OUTPUT_REG_SET);
        if (ret) {
                dev_err(dev, "unable to init generic GPIO\n");
                return ret;