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Wed, 10 Sep 2025 17:37:48 -0700 (PDT) Message-ID: <01a7cc78-fdae-4a1e-bf78-961e7ec214b2@sifive.com> Date: Wed, 10 Sep 2025 19:37:46 -0500 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 11/15] gpio: sifive: use new generic GPIO chip API To: Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, Bartosz Golaszewski , Linus Walleij , Keguang Zhang , Alban Bedel , Doug Berger , Florian Fainelli , Broadcom internal kernel review list , Matthias Brugger , AngeloGioacchino Del Regno , Paul Walmsley , Yixun Lan , Andy Shevchenko References: <20250910-gpio-mmio-gpio-conv-part4-v2-0-f3d1a4c57124@linaro.org> <20250910-gpio-mmio-gpio-conv-part4-v2-11-f3d1a4c57124@linaro.org> From: Samuel Holland Content-Language: en-US In-Reply-To: <20250910-gpio-mmio-gpio-conv-part4-v2-11-f3d1a4c57124@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Bartosz, On 2025-09-10 2:12 AM, Bartosz Golaszewski wrote: > From: Bartosz Golaszewski > > Convert the driver to using the new generic GPIO chip interfaces from > linux/gpio/generic.h. > > Signed-off-by: Bartosz Golaszewski > --- > drivers/gpio/gpio-sifive.c | 73 ++++++++++++++++++++++++---------------------- > 1 file changed, 38 insertions(+), 35 deletions(-) > > diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c > index 98ef975c44d9a6c9238605cfd1d5820fd70a66ca..2ced87ffd3bbf219c11857391eb4ea808adc0527 100644 > --- a/drivers/gpio/gpio-sifive.c > +++ b/drivers/gpio/gpio-sifive.c > @@ -7,6 +7,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -32,7 +33,7 @@ > > struct sifive_gpio { > void __iomem *base; > - struct gpio_chip gc; > + struct gpio_generic_chip gen_gc; > struct regmap *regs; > unsigned long irq_state; > unsigned int trigger[SIFIVE_GPIO_MAX]; > @@ -41,10 +42,10 @@ struct sifive_gpio { > > static void sifive_gpio_set_ie(struct sifive_gpio *chip, unsigned int offset) > { > - unsigned long flags; > unsigned int trigger; > > - raw_spin_lock_irqsave(&chip->gc.bgpio_lock, flags); > + guard(gpio_generic_lock_irqsave)(&chip->gen_gc); > + > trigger = (chip->irq_state & BIT(offset)) ? chip->trigger[offset] : 0; > regmap_update_bits(chip->regs, SIFIVE_GPIO_RISE_IE, BIT(offset), > (trigger & IRQ_TYPE_EDGE_RISING) ? BIT(offset) : 0); > @@ -54,7 +55,6 @@ static void sifive_gpio_set_ie(struct sifive_gpio *chip, unsigned int offset) > (trigger & IRQ_TYPE_LEVEL_HIGH) ? BIT(offset) : 0); > regmap_update_bits(chip->regs, SIFIVE_GPIO_LOW_IE, BIT(offset), > (trigger & IRQ_TYPE_LEVEL_LOW) ? BIT(offset) : 0); > - raw_spin_unlock_irqrestore(&chip->gc.bgpio_lock, flags); > } > > static int sifive_gpio_irq_set_type(struct irq_data *d, unsigned int trigger) > @@ -72,13 +72,12 @@ static int sifive_gpio_irq_set_type(struct irq_data *d, unsigned int trigger) > } > > static void sifive_gpio_irq_enable(struct irq_data *d) > -{ > + { This looks like an unintentional whitespace change. > struct gpio_chip *gc = irq_data_get_irq_chip_data(d); > struct sifive_gpio *chip = gpiochip_get_data(gc); > irq_hw_number_t hwirq = irqd_to_hwirq(d); > int offset = hwirq % SIFIVE_GPIO_MAX; > u32 bit = BIT(offset); > - unsigned long flags; > > gpiochip_enable_irq(gc, hwirq); > irq_chip_enable_parent(d); > @@ -86,13 +85,13 @@ static void sifive_gpio_irq_enable(struct irq_data *d) > /* Switch to input */ > gc->direction_input(gc, offset); > > - raw_spin_lock_irqsave(&gc->bgpio_lock, flags); > - /* Clear any sticky pending interrupts */ > - regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); > - raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags); > + scoped_guard(gpio_generic_lock_irqsave, &chip->gen_gc) { > + /* Clear any sticky pending interrupts */ > + regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); > + } This block (and the copy below) don't actually need any locking, since these are R/W1C bits. From the manual: "Once the interrupt is pending, it will remain set until a 1 is written to the *_ip register at that bit." I can send this as a follow-up improvement if you want to keep this limited to the API conversion. So with the minor whitespace fix: Reviewed-by: Samuel Holland Regards, Samuel > > /* Enable interrupts */ > assign_bit(offset, &chip->irq_state, 1); > @@ -118,15 +117,14 @@ static void sifive_gpio_irq_eoi(struct irq_data *d) > struct sifive_gpio *chip = gpiochip_get_data(gc); > int offset = irqd_to_hwirq(d) % SIFIVE_GPIO_MAX; > u32 bit = BIT(offset); > - unsigned long flags; > > - raw_spin_lock_irqsave(&gc->bgpio_lock, flags); > - /* Clear all pending interrupts */ > - regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); > - regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); > - raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags); > + scoped_guard(gpio_generic_lock_irqsave, &chip->gen_gc) { > + /* Clear all pending interrupts */ > + regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); > + regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); > + } > > irq_chip_eoi_parent(d); > } > @@ -179,6 +177,7 @@ static const struct regmap_config sifive_gpio_regmap_config = { > > static int sifive_gpio_probe(struct platform_device *pdev) > { > + struct gpio_generic_chip_config config; > struct device *dev = &pdev->dev; > struct irq_domain *parent; > struct gpio_irq_chip *girq; > @@ -217,13 +216,17 @@ static int sifive_gpio_probe(struct platform_device *pdev) > */ > parent = irq_get_irq_data(chip->irq_number[0])->domain; > > - ret = bgpio_init(&chip->gc, dev, 4, > - chip->base + SIFIVE_GPIO_INPUT_VAL, > - chip->base + SIFIVE_GPIO_OUTPUT_VAL, > - NULL, > - chip->base + SIFIVE_GPIO_OUTPUT_EN, > - chip->base + SIFIVE_GPIO_INPUT_EN, > - BGPIOF_READ_OUTPUT_REG_SET); > + config = (struct gpio_generic_chip_config) { > + .dev = dev, > + .sz = 4, > + .dat = chip->base + SIFIVE_GPIO_INPUT_VAL, > + .set = chip->base + SIFIVE_GPIO_OUTPUT_VAL, > + .dirout = chip->base + SIFIVE_GPIO_OUTPUT_EN, > + .dirin = chip->base + SIFIVE_GPIO_INPUT_EN, > + .flags = BGPIOF_READ_OUTPUT_REG_SET, > + }; > + > + ret = gpio_generic_chip_init(&chip->gen_gc, &config); > if (ret) { > dev_err(dev, "unable to init generic GPIO\n"); > return ret; > @@ -236,12 +239,12 @@ static int sifive_gpio_probe(struct platform_device *pdev) > regmap_write(chip->regs, SIFIVE_GPIO_LOW_IE, 0); > chip->irq_state = 0; > > - chip->gc.base = -1; > - chip->gc.ngpio = ngpio; > - chip->gc.label = dev_name(dev); > - chip->gc.parent = dev; > - chip->gc.owner = THIS_MODULE; > - girq = &chip->gc.irq; > + chip->gen_gc.gc.base = -1; > + chip->gen_gc.gc.ngpio = ngpio; > + chip->gen_gc.gc.label = dev_name(dev); > + chip->gen_gc.gc.parent = dev; > + chip->gen_gc.gc.owner = THIS_MODULE; > + girq = &chip->gen_gc.gc.irq; > gpio_irq_chip_set_chip(girq, &sifive_gpio_irqchip); > girq->fwnode = dev_fwnode(dev); > girq->parent_domain = parent; > @@ -249,7 +252,7 @@ static int sifive_gpio_probe(struct platform_device *pdev) > girq->handler = handle_bad_irq; > girq->default_type = IRQ_TYPE_NONE; > > - return gpiochip_add_data(&chip->gc, chip); > + return gpiochip_add_data(&chip->gen_gc.gc, chip); > } > > static const struct of_device_id sifive_gpio_match[] = { >