linux-kernel - [PATCH 1/3] gpio: syscon: Add support for a custom get operation

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Date:   Tue, 10 Sep 2019 17:28:53 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH 1/3] gpio: syscon: Add support for a custom get operation

Some drivers might need a custom get operation to match custom
behavior implemented in the set operation.

Add plumbing for supporting that.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
---
 drivers/gpio/gpio-syscon.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 31f332074d7d..05c537ed73f1 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -43,8 +43,9 @@ struct syscon_gpio_data {
 	unsigned int	bit_count;
 	unsigned int	dat_bit_offset;
 	unsigned int	dir_bit_offset;
-	void		(*set)(struct gpio_chip *chip,
-			       unsigned offset, int value);
+	int		(*get)(struct gpio_chip *chip, unsigned offset);
+	void		(*set)(struct gpio_chip *chip, unsigned offset,
+			       int value);
 };
 
 struct syscon_gpio_priv {
@@ -252,7 +253,7 @@ static int syscon_gpio_probe(struct platform_device *pdev)
 	priv->chip.label = dev_name(dev);
 	priv->chip.base = -1;
 	priv->chip.ngpio = priv->data->bit_count;
-	priv->chip.get = syscon_gpio_get;
+	priv->chip.get = priv->data->get ? : syscon_gpio_get;
 	if (priv->data->flags & GPIO_SYSCON_FEAT_IN)
 		priv->chip.direction_input = syscon_gpio_dir_in;
 	if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) {
-- 
2.23.0