diff mbox series

[v3,4/4] gpio: mb86s7x: enable ACPI support

Message ID 20190527112720.2266-5-ard.biesheuvel@linaro.org (mailing list archive)
State Superseded, archived
Headers show
Series synquacer: implement ACPI gpio/interrupt support | expand

Commit Message

Ard Biesheuvel May 27, 2019, 11:27 a.m. UTC 
Make the mb86s7x GPIO block discoverable via ACPI. In addition, add
support for ACPI GPIO interrupts routed via platform interrupts, by
wiring the two together via the to_irq() gpiochip callback.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/gpio/gpio-mb86s7x.c | 51 +++++++++++++++++---
 1 file changed, 44 insertions(+), 7 deletions(-)

Comments

Linus Walleij May 28, 2019, 8:34 a.m. UTC | #1 
On Mon, May 27, 2019 at 1:27 PM Ard Biesheuvel
<ard.biesheuvel@linaro.org> wrote:

> Make the mb86s7x GPIO block discoverable via ACPI. In addition, add
> support for ACPI GPIO interrupts routed via platform interrupts, by
> wiring the two together via the to_irq() gpiochip callback.
>
> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

I assume you want to merge this through the IRQ tree or the ACPI
tree, so go ahead.

If you want me to queue the whole thing in the GPIO tree just tell
me (once we have the ACKs in place).

Yours,
Linus Walleij
Ard Biesheuvel May 28, 2019, 11:26 a.m. UTC | #2 
On Tue, 28 May 2019 at 10:34, Linus Walleij <linus.walleij@linaro.org> wrote:
>
> On Mon, May 27, 2019 at 1:27 PM Ard Biesheuvel
> <ard.biesheuvel@linaro.org> wrote:
>
> > Make the mb86s7x GPIO block discoverable via ACPI. In addition, add
> > support for ACPI GPIO interrupts routed via platform interrupts, by
> > wiring the two together via the to_irq() gpiochip callback.
> >
> > Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
>

Thanks.

> I assume you want to merge this through the IRQ tree or the ACPI
> tree, so go ahead.
>
> If you want me to queue the whole thing in the GPIO tree just tell
> me (once we have the ACKs in place).
>

Marc is willing to take the whole thing via the irqchip tree. I'll
need to apply some tweaks though, so I'll send out a v4 shortly.
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-mb86s7x.c b/drivers/gpio/gpio-mb86s7x.c
index 9308081e0a4a..64027f57a8aa 100644
--- a/drivers/gpio/gpio-mb86s7x.c
+++ b/drivers/gpio/gpio-mb86s7x.c
@@ -14,6 +14,7 @@ 
  *  GNU General Public License for more details.
  */
 
+#include <linux/acpi.h>
 #include <linux/io.h>
 #include <linux/init.h>
 #include <linux/clk.h>
@@ -27,6 +28,8 @@ 
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 
+#include "gpiolib.h"
+
 /*
  * Only first 8bits of a register correspond to each pin,
  * so there are 4 registers for 32 pins.
@@ -143,6 +146,20 @@  static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
 	spin_unlock_irqrestore(&gchip->lock, flags);
 }
 
+static int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
+{
+	int irq, index;
+
+	for (index = 0;; index++) {
+		irq = platform_get_irq(to_platform_device(gc->parent), index);
+		if (irq <= 0)
+			break;
+		if (irq_get_irq_data(irq)->hwirq == offset)
+			return irq;
+	}
+	return -EINVAL;
+}
+
 static int mb86s70_gpio_probe(struct platform_device *pdev)
 {
 	struct mb86s70_gpio_chip *gchip;
@@ -158,13 +175,15 @@  static int mb86s70_gpio_probe(struct platform_device *pdev)
 	if (IS_ERR(gchip->base))
 		return PTR_ERR(gchip->base);
 
-	gchip->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(gchip->clk))
-		return PTR_ERR(gchip->clk);
+	if (!has_acpi_companion(&pdev->dev)) {
+		gchip->clk = devm_clk_get(&pdev->dev, NULL);
+		if (IS_ERR(gchip->clk))
+			return PTR_ERR(gchip->clk);
 
-	ret = clk_prepare_enable(gchip->clk);
-	if (ret)
-		return ret;
+		ret = clk_prepare_enable(gchip->clk);
+		if (ret)
+			return ret;
+	}
 
 	spin_lock_init(&gchip->lock);
 
@@ -180,19 +199,28 @@  static int mb86s70_gpio_probe(struct platform_device *pdev)
 	gchip->gc.parent = &pdev->dev;
 	gchip->gc.base = -1;
 
+	if (has_acpi_companion(&pdev->dev))
+		gchip->gc.to_irq = mb86s70_gpio_to_irq;
+
 	ret = gpiochip_add_data(&gchip->gc, gchip);
 	if (ret) {
 		dev_err(&pdev->dev, "couldn't register gpio driver\n");
 		clk_disable_unprepare(gchip->clk);
+		return ret;
 	}
 
-	return ret;
+	if (has_acpi_companion(&pdev->dev))
+		acpi_gpiochip_request_interrupts(&gchip->gc);
+
+	return 0;
 }
 
 static int mb86s70_gpio_remove(struct platform_device *pdev)
 {
 	struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev);
 
+	if (has_acpi_companion(&pdev->dev))
+		acpi_gpiochip_free_interrupts(&gchip->gc);
 	gpiochip_remove(&gchip->gc);
 	clk_disable_unprepare(gchip->clk);
 
@@ -205,10 +233,19 @@  static const struct of_device_id mb86s70_gpio_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = {
+	{ "SCX0007" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids);
+#endif
+
 static struct platform_driver mb86s70_gpio_driver = {
 	.driver = {
 		.name = "mb86s70-gpio",
 		.of_match_table = mb86s70_gpio_dt_ids,
+		.acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids),
 	},
 	.probe = mb86s70_gpio_probe,
 	.remove = mb86s70_gpio_remove,