linux-kernel - [PATCH] gpio: regmap: fix direction register check

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Date:   Tue,  2 Mar 2021 19:06:21 +0100
From:   Álvaro Fernández Rojas 
        <noltari@...il.com>
To:     Michael Walle <michael@...le.cc>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Álvaro Fernández Rojas 
        <noltari@...il.com>
Subject: [PATCH] gpio: regmap: fix direction register check

If there's a direction register, we should also have dat or set registers.
However, we only need one of them, not both.

Fixes: ebe363197e52 ("gpio: add a reusable generic gpio_chip using regmap")
Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
 drivers/gpio/gpio-regmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 23b0a8572f53..5a9fca00b5e8 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -194,7 +194,7 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 	/* if we have a direction register we need both input and output */
 	if ((config->reg_dir_out_base || config->reg_dir_in_base) &&
-	    (!config->reg_dat_base || !config->reg_set_base))
+	    (!config->reg_dat_base && !config->reg_set_base))
 		return ERR_PTR(-EINVAL);
 
 	/* we don't support having both registers simultaneously for now */
-- 
2.20.1