linux-kernel - [PATCH 2/4] pinctrl: samsung: use add_pin

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Message-ID: <20231006125557.212681-3-m.majewski2@samsung.com>
Date:   Fri,  6 Oct 2023 14:55:55 +0200
From:   Mateusz Majewski <m.majewski2@...sung.com>
To:     linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mateusz Majewski <m.majewski2@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH 2/4] pinctrl: samsung: use add_pin_ranges method to add
 pinctrl ranges

This is preferable since we can read the base in the global GPIO
numberspace from the chip instead of needing to select it ourselves.

Past versions could not do this, since they needed to add all the ranges
before enabling the pinctrl subsystem, which was done before registering
the GPIO chip. However, right now we enable the pinctrl subsystem after
registering the chip and so this became possible.

Signed-off-by: Mateusz Majewski <m.majewski2@...sung.com>
---
 drivers/pinctrl/samsung/pinctrl-samsung.c | 31 +++++++++++++----------
 drivers/pinctrl/samsung/pinctrl-samsung.h |  2 ++
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index e496af72a587..511a3ac51f76 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -665,6 +665,21 @@ static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 	return (virq) ? : -ENXIO;
 }
 
+static int samsung_add_pin_ranges(struct gpio_chip *gc)
+{
+	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
+
+	bank->grange.name = bank->name;
+	bank->grange.id = bank->id;
+	bank->grange.pin_base = bank->drvdata->pin_base + bank->pin_base;
+	bank->grange.base = gc->base;
+	bank->grange.npins = bank->nr_pins;
+	bank->grange.gc = &bank->gpio_chip;
+	pinctrl_add_gpio_range(bank->drvdata->pctl_dev, &bank->grange);
+
+	return 0;
+}
+
 static struct samsung_pin_group *samsung_pinctrl_create_groups(
 				struct device *dev,
 				struct samsung_pinctrl_drv_data *drvdata,
@@ -892,6 +907,7 @@ static int samsung_pinctrl_register(struct platform_device *pdev,
 	/* for each pin, the name of the pin is pin-bank name + pin number */
 	for (bank = 0; bank < drvdata->nr_banks; bank++) {
 		pin_bank = &drvdata->pin_banks[bank];
+		pin_bank->id = bank;
 		for (pin = 0; pin < pin_bank->nr_pins; pin++) {
 			sprintf(pin_names, "%s-%d", pin_bank->name, pin);
 			pdesc = pindesc + pin_bank->pin_base + pin;
@@ -911,18 +927,6 @@ static int samsung_pinctrl_register(struct platform_device *pdev,
 		return ret;
 	}
 
-	for (bank = 0; bank < drvdata->nr_banks; ++bank) {
-		pin_bank = &drvdata->pin_banks[bank];
-		pin_bank->grange.name = pin_bank->name;
-		pin_bank->grange.id = bank;
-		pin_bank->grange.pin_base = drvdata->pin_base
-						+ pin_bank->pin_base;
-		pin_bank->grange.base = pin_bank->grange.pin_base;
-		pin_bank->grange.npins = pin_bank->nr_pins;
-		pin_bank->grange.gc = &pin_bank->gpio_chip;
-		pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
-	}
-
 	return 0;
 }
 
@@ -947,6 +951,7 @@ static const struct gpio_chip samsung_gpiolib_chip = {
 	.direction_input = samsung_gpio_direction_input,
 	.direction_output = samsung_gpio_direction_output,
 	.to_irq = samsung_gpio_to_irq,
+	.add_pin_ranges = samsung_add_pin_ranges,
 	.owner = THIS_MODULE,
 };
 
@@ -963,7 +968,7 @@ static int samsung_gpiolib_register(struct platform_device *pdev,
 		bank->gpio_chip = samsung_gpiolib_chip;
 
 		gc = &bank->gpio_chip;
-		gc->base = bank->grange.base;
+		gc->base = drvdata->pin_base + bank->pin_base;
 		gc->ngpio = bank->nr_pins;
 		gc->parent = &pdev->dev;
 		gc->fwnode = bank->fwnode;
diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.h b/drivers/pinctrl/samsung/pinctrl-samsung.h
index 9af93e3d8d9f..173db20f70d3 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.h
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.h
@@ -148,6 +148,7 @@ struct samsung_pin_bank_data {
  * @eint_mask: bit mask of pins which support EINT function.
  * @eint_offset: SoC-specific EINT register or interrupt offset of bank.
  * @name: name to be prefixed for each pin in this pin bank.
+ * @id: id of the bank, propagated to the pin range.
  * @pin_base: starting pin number of the bank.
  * @soc_priv: per-bank private data for SoC-specific code.
  * @of_node: OF node of the bank.
@@ -170,6 +171,7 @@ struct samsung_pin_bank {
 	u32		eint_mask;
 	u32		eint_offset;
 	const char	*name;
+	u32		id;
 
 	u32		pin_base;
 	void		*soc_priv;
-- 
2.42.0