linux-kernel - [PATCH v2 1/1] pinctrl: stmfx: add irq_request/release

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Date:   Wed, 9 Oct 2019 11:16:06 +0200
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Amelie Delaunay <amelie.delaunay@...com>
Subject: [PATCH v2 1/1] pinctrl: stmfx: add irq_request/release_resources callbacks

When an STMFX IO is used as interrupt through the interrupt-controller
binding, the STMFX driver should configure this IO as input. Default
value of STMFX IO direction is input, but if the IO is used as output
before the interrupt use, it will not work without these callbacks.

Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
Changes in V2:
- use gpiochip_reqres_irq and gpiochip_relres_irq instead of calling
explicitely the lock/unlock.
---
 drivers/pinctrl/pinctrl-stmfx.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
index 564660028fcc..e5d49742d4db 100644
--- a/drivers/pinctrl/pinctrl-stmfx.c
+++ b/drivers/pinctrl/pinctrl-stmfx.c
@@ -505,6 +505,25 @@ static void stmfx_pinctrl_irq_bus_sync_unlock(struct irq_data *data)
 	mutex_unlock(&pctl->lock);
 }
 
+static int stmfx_gpio_irq_request_resources(struct irq_data *data)
+{
+	struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+	int ret;
+
+	ret = stmfx_gpio_direction_input(gpio_chip, data->hwirq);
+	if (ret)
+		return ret;
+
+	return gpiochip_reqres_irq(gpio_chip, data->hwirq);
+}
+
+static void stmfx_gpio_irq_release_resources(struct irq_data *data)
+{
+	struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
+
+	return gpiochip_relres_irq(gpio_chip, data->hwirq);
+}
+
 static void stmfx_pinctrl_irq_toggle_trigger(struct stmfx_pinctrl *pctl,
 					     unsigned int offset)
 {
@@ -678,6 +697,8 @@ static int stmfx_pinctrl_probe(struct platform_device *pdev)
 	pctl->irq_chip.irq_set_type = stmfx_pinctrl_irq_set_type;
 	pctl->irq_chip.irq_bus_lock = stmfx_pinctrl_irq_bus_lock;
 	pctl->irq_chip.irq_bus_sync_unlock = stmfx_pinctrl_irq_bus_sync_unlock;
+	pctl->irq_chip.irq_request_resources = stmfx_gpio_irq_request_resources;
+	pctl->irq_chip.irq_release_resources = stmfx_gpio_irq_release_resources;
 
 	ret = gpiochip_irqchip_add_nested(&pctl->gpio_chip, &pctl->irq_chip,
 					  0, handle_bad_irq, IRQ_TYPE_NONE);
-- 
2.17.1