linux-kernel - [PATCH v2] pinctrl: samsung: Calculate GPIO base for pinctrl_add_gpio

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Date:   Tue, 28 Feb 2017 17:04:35 +0000
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     <linus.walleij@...aro.org>, <krzk@...nel.org>
CC:     <tomasz.figa@...il.com>, <s.nawrocki@...sung.com>,
        <linux-gpio@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <patches@...nsource.wolfsonmicro.com>
Subject: [PATCH v2] pinctrl: samsung: Calculate GPIO base for pinctrl_add_gpio_range

As the pinctrl is now added before the GPIOs are registered we need to
manually calculate what the GPIO base will be, otherwise the base for
each gpio_range will be set to zero. Fortunately the driver
already assigns a GPIO base, in samsung_gpiolib_register, and uses the
same calculation it does for the pin_base. Meaning the two will always
be the same and allowing us to reuse the pinbase and avoid the issue.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---

Changes since v1:
 - Use grange.base in samsung_gpiolib_register to make it more
   clear the two are related in the driver.

Thanks,
Charles


 drivers/pinctrl/samsung/pinctrl-samsung.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index ddc8d6b..27d5157 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -882,7 +882,7 @@ static int samsung_pinctrl_register(struct platform_device *pdev,
 		pin_bank->grange.id = bank;
 		pin_bank->grange.pin_base = drvdata->pin_base
 						+ pin_bank->pin_base;
-		pin_bank->grange.base = pin_bank->gpio_chip.base;
+		pin_bank->grange.base = pin_bank->grange.pin_base;
 		pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
 		pin_bank->grange.gc = &pin_bank->gpio_chip;
 		pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
@@ -928,7 +928,7 @@ static int samsung_gpiolib_register(struct platform_device *pdev,
 		bank->gpio_chip = samsung_gpiolib_chip;
 
 		gc = &bank->gpio_chip;
-		gc->base = drvdata->pin_base + bank->pin_base;
+		gc->base = bank->grange.base;
 		gc->ngpio = bank->nr_pins;
 		gc->parent = &pdev->dev;
 		gc->of_node = bank->of_node;
-- 
2.1.4