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

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[ Upstream commit cc38ef936840ac29204d806deb4d1836ec509594 ]

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: 96868dce64 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Niklas Cassel
2022-02-04 13:02:25 +00:00
committed by Greg Kroah-Hartman
parent 48e413087d
commit 1ba45dd326
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpio-sifive.c
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@@ -206,7 +206,7 @@ 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;