| Message ID | 1581937039-12964-1-git-send-email-srinivas.neeli@xilinx.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] gpio: xilinx: Add clock adaptation support | expand |
pon., 17 lut 2020 o 11:57 Srinivas Neeli <srinivas.neeli@xilinx.com> napisał(a): > > Add support of clock adaptation for AXI GPIO driver. > > Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com> > --- > drivers/gpio/gpio-xilinx.c | 105 ++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 103 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c > index a9748b5198e6..26753ae58295 100644 > --- a/drivers/gpio/gpio-xilinx.c > +++ b/drivers/gpio/gpio-xilinx.c > @@ -14,6 +14,8 @@ > #include <linux/io.h> > #include <linux/gpio/driver.h> > #include <linux/slab.h> > +#include <linux/pm_runtime.h> > +#include <linux/clk.h> > > /* Register Offset Definitions */ > #define XGPIO_DATA_OFFSET (0x0) /* Data register */ > @@ -38,6 +40,7 @@ > * @gpio_state: GPIO state shadow register > * @gpio_dir: GPIO direction shadow register > * @gpio_lock: Lock used for synchronization > + * @clk: clock resource for this driver > */ > struct xgpio_instance { > struct gpio_chip gc; > @@ -45,7 +48,8 @@ struct xgpio_instance { > unsigned int gpio_width[2]; > u32 gpio_state[2]; > u32 gpio_dir[2]; > - spinlock_t gpio_lock[2]; > + spinlock_t gpio_lock[2]; /* For serializing operations */ > + struct clk *clk; > }; > > static inline int xgpio_index(struct xgpio_instance *chip, int gpio) > @@ -255,6 +259,70 @@ static void xgpio_save_regs(struct xgpio_instance *chip) > chip->gpio_dir[1]); > } > > +static int xgpio_request(struct gpio_chip *chip, unsigned int offset) > +{ > + int ret = pm_runtime_get_sync(chip->parent); > + > + /* > + * If the device is already active pm_runtime_get() will return 1 on > + * success, but gpio_request still needs to return 0. > + */ > + return ret < 0 ? ret : 0; > +} > + > +static void xgpio_free(struct gpio_chip *chip, unsigned int offset) > +{ > + pm_runtime_put(chip->parent); > +} > + > +static int __maybe_unused xgpio_suspend(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + int irq = platform_get_irq(pdev, 0); > + struct irq_data *data = irq_get_irq_data(irq); > + > + if (!irqd_is_wakeup_set(data)) > + return pm_runtime_force_suspend(dev); > + > + return 0; > +} > + > +static int __maybe_unused xgpio_resume(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + int irq = platform_get_irq(pdev, 0); > + struct irq_data *data = irq_get_irq_data(irq); > + > + if (!irqd_is_wakeup_set(data)) > + return pm_runtime_force_resume(dev); > + > + return 0; > +} > + > +static int __maybe_unused xgpio_runtime_suspend(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct xgpio_instance *gpio = platform_get_drvdata(pdev); > + > + clk_disable(gpio->clk); > + > + return 0; > +} > + > +static int __maybe_unused xgpio_runtime_resume(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct xgpio_instance *gpio = platform_get_drvdata(pdev); > + > + return clk_enable(gpio->clk); > +} > + > +static const struct dev_pm_ops xgpio_dev_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume) > + SET_RUNTIME_PM_OPS(xgpio_runtime_suspend, > + xgpio_runtime_resume, NULL) > +}; > + > /** > * xgpio_of_probe - Probe method for the GPIO device. > * @pdev: pointer to the platform device > @@ -323,6 +391,8 @@ static int xgpio_probe(struct platform_device *pdev) > chip->gc.direction_output = xgpio_dir_out; > chip->gc.get = xgpio_get; > chip->gc.set = xgpio_set; > + chip->gc.request = xgpio_request; > + chip->gc.free = xgpio_free; > chip->gc.set_multiple = xgpio_set_multiple; > > chip->gc.label = dev_name(&pdev->dev); > @@ -333,15 +403,45 @@ static int xgpio_probe(struct platform_device *pdev) > return PTR_ERR(chip->regs); > } > > + chip->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); > + if (IS_ERR(chip->clk)) { > + if (PTR_ERR(chip->clk) != -ENOENT) { > + if (PTR_ERR(chip->clk) != -EPROBE_DEFER) > + dev_err(&pdev->dev, "Input clock not found\n"); > + return PTR_ERR(chip->clk); > + } > + /* > + * Clock framework support is optional, continue on > + * anyways if we don't find a matching clock. > + */ Why not use devm_clk_get_optional() then? > + chip->clk = NULL; > + } > + status = clk_prepare_enable(chip->clk); > + if (status < 0) { > + dev_err(&pdev->dev, "Failed to prepare clk\n"); > + return status; > + } > + pm_runtime_enable(&pdev->dev); > + status = pm_runtime_get_sync(&pdev->dev); > + if (status < 0) > + goto err_unprepare_clk; > + > xgpio_save_regs(chip); > > status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip); > if (status) { > dev_err(&pdev->dev, "failed to add GPIO chip\n"); > - return status; > + goto err_pm_put; > } > > + pm_runtime_put(&pdev->dev); > return 0; > +err_pm_put: > + pm_runtime_put(&pdev->dev); > +err_unprepare_clk: > + pm_runtime_disable(&pdev->dev); > + clk_unprepare(chip->clk); > + return status; > } > > static const struct of_device_id xgpio_of_match[] = { > @@ -356,6 +456,7 @@ static struct platform_driver xgpio_plat_driver = { > .driver = { > .name = "gpio-xilinx", > .of_match_table = xgpio_of_match, > + .pm = &xgpio_dev_pm_ops, > }, > }; > > -- > 2.7.4 >
Hi, I agree ,will address comments in V2. > -----Original Message----- > From: Bartosz Golaszewski <bgolaszewski@baylibre.com> > Sent: Tuesday, February 18, 2020 9:33 PM > To: Srinivas Neeli <sneeli@xilinx.com> > Cc: Michal Simek <michals@xilinx.com>; Shubhrajyoti Datta > <shubhraj@xilinx.com>; Srinivas Goud <sgoud@xilinx.com>; Linus Walleij > <linus.walleij@linaro.org>; LKML <linux-kernel@vger.kernel.org>; arm-soc > <linux-arm-kernel@lists.infradead.org>; linux-gpio <linux- > gpio@vger.kernel.org>; git <git@xilinx.com> > Subject: Re: [PATCH 1/2] gpio: xilinx: Add clock adaptation support > > pon., 17 lut 2020 o 11:57 Srinivas Neeli <srinivas.neeli@xilinx.com> napisał(a): > > > > Add support of clock adaptation for AXI GPIO driver. > > > > Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com> > > --- > > drivers/gpio/gpio-xilinx.c | 105 > > ++++++++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 103 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c > > index a9748b5198e6..26753ae58295 100644 > > --- a/drivers/gpio/gpio-xilinx.c > > +++ b/drivers/gpio/gpio-xilinx.c > > @@ -14,6 +14,8 @@ > > #include <linux/io.h> > > #include <linux/gpio/driver.h> > > #include <linux/slab.h> > > +#include <linux/pm_runtime.h> > > +#include <linux/clk.h> > > > > /* Register Offset Definitions */ > > #define XGPIO_DATA_OFFSET (0x0) /* Data register */ > > @@ -38,6 +40,7 @@ > > * @gpio_state: GPIO state shadow register > > * @gpio_dir: GPIO direction shadow register > > * @gpio_lock: Lock used for synchronization > > + * @clk: clock resource for this driver > > */ > > struct xgpio_instance { > > struct gpio_chip gc; > > @@ -45,7 +48,8 @@ struct xgpio_instance { > > unsigned int gpio_width[2]; > > u32 gpio_state[2]; > > u32 gpio_dir[2]; > > - spinlock_t gpio_lock[2]; > > + spinlock_t gpio_lock[2]; /* For serializing operations */ > > + struct clk *clk; > > }; > > > > static inline int xgpio_index(struct xgpio_instance *chip, int gpio) > > @@ -255,6 +259,70 @@ static void xgpio_save_regs(struct xgpio_instance > *chip) > > chip->gpio_dir[1]); } > > > > +static int xgpio_request(struct gpio_chip *chip, unsigned int offset) > > +{ > > + int ret = pm_runtime_get_sync(chip->parent); > > + > > + /* > > + * If the device is already active pm_runtime_get() will return 1 on > > + * success, but gpio_request still needs to return 0. > > + */ > > + return ret < 0 ? ret : 0; > > +} > > + > > +static void xgpio_free(struct gpio_chip *chip, unsigned int offset) { > > + pm_runtime_put(chip->parent); > > +} > > + > > +static int __maybe_unused xgpio_suspend(struct device *dev) { > > + struct platform_device *pdev = to_platform_device(dev); > > + int irq = platform_get_irq(pdev, 0); > > + struct irq_data *data = irq_get_irq_data(irq); > > + > > + if (!irqd_is_wakeup_set(data)) > > + return pm_runtime_force_suspend(dev); > > + > > + return 0; > > +} > > + > > +static int __maybe_unused xgpio_resume(struct device *dev) { > > + struct platform_device *pdev = to_platform_device(dev); > > + int irq = platform_get_irq(pdev, 0); > > + struct irq_data *data = irq_get_irq_data(irq); > > + > > + if (!irqd_is_wakeup_set(data)) > > + return pm_runtime_force_resume(dev); > > + > > + return 0; > > +} > > + > > +static int __maybe_unused xgpio_runtime_suspend(struct device *dev) { > > + struct platform_device *pdev = to_platform_device(dev); > > + struct xgpio_instance *gpio = platform_get_drvdata(pdev); > > + > > + clk_disable(gpio->clk); > > + > > + return 0; > > +} > > + > > +static int __maybe_unused xgpio_runtime_resume(struct device *dev) { > > + struct platform_device *pdev = to_platform_device(dev); > > + struct xgpio_instance *gpio = platform_get_drvdata(pdev); > > + > > + return clk_enable(gpio->clk); > > +} > > + > > +static const struct dev_pm_ops xgpio_dev_pm_ops = { > > + SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume) > > + SET_RUNTIME_PM_OPS(xgpio_runtime_suspend, > > + xgpio_runtime_resume, NULL) }; > > + > > /** > > * xgpio_of_probe - Probe method for the GPIO device. > > * @pdev: pointer to the platform device @@ -323,6 +391,8 @@ static > > int xgpio_probe(struct platform_device *pdev) > > chip->gc.direction_output = xgpio_dir_out; > > chip->gc.get = xgpio_get; > > chip->gc.set = xgpio_set; > > + chip->gc.request = xgpio_request; > > + chip->gc.free = xgpio_free; > > chip->gc.set_multiple = xgpio_set_multiple; > > > > chip->gc.label = dev_name(&pdev->dev); @@ -333,15 +403,45 @@ > > static int xgpio_probe(struct platform_device *pdev) > > return PTR_ERR(chip->regs); > > } > > > > + chip->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); > > + if (IS_ERR(chip->clk)) { > > + if (PTR_ERR(chip->clk) != -ENOENT) { > > + if (PTR_ERR(chip->clk) != -EPROBE_DEFER) > > + dev_err(&pdev->dev, "Input clock not found\n"); > > + return PTR_ERR(chip->clk); > > + } > > + /* > > + * Clock framework support is optional, continue on > > + * anyways if we don't find a matching clock. > > + */ > > Why not use devm_clk_get_optional() then? > > > + chip->clk = NULL; > > + } > > + status = clk_prepare_enable(chip->clk); > > + if (status < 0) { > > + dev_err(&pdev->dev, "Failed to prepare clk\n"); > > + return status; > > + } > > + pm_runtime_enable(&pdev->dev); > > + status = pm_runtime_get_sync(&pdev->dev); > > + if (status < 0) > > + goto err_unprepare_clk; > > + > > xgpio_save_regs(chip); > > > > status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip); > > if (status) { > > dev_err(&pdev->dev, "failed to add GPIO chip\n"); > > - return status; > > + goto err_pm_put; > > } > > > > + pm_runtime_put(&pdev->dev); > > return 0; > > +err_pm_put: > > + pm_runtime_put(&pdev->dev); > > +err_unprepare_clk: > > + pm_runtime_disable(&pdev->dev); > > + clk_unprepare(chip->clk); > > + return status; > > } > > > > static const struct of_device_id xgpio_of_match[] = { @@ -356,6 > > +456,7 @@ static struct platform_driver xgpio_plat_driver = { > > .driver = { > > .name = "gpio-xilinx", > > .of_match_table = xgpio_of_match, > > + .pm = &xgpio_dev_pm_ops, > > }, > > }; > > > > -- > > 2.7.4 > >
diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index a9748b5198e6..26753ae58295 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -14,6 +14,8 @@ #include <linux/io.h> #include <linux/gpio/driver.h> #include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <linux/clk.h> /* Register Offset Definitions */ #define XGPIO_DATA_OFFSET (0x0) /* Data register */ @@ -38,6 +40,7 @@ * @gpio_state: GPIO state shadow register * @gpio_dir: GPIO direction shadow register * @gpio_lock: Lock used for synchronization + * @clk: clock resource for this driver */ struct xgpio_instance { struct gpio_chip gc; @@ -45,7 +48,8 @@ struct xgpio_instance { unsigned int gpio_width[2]; u32 gpio_state[2]; u32 gpio_dir[2]; - spinlock_t gpio_lock[2]; + spinlock_t gpio_lock[2]; /* For serializing operations */ + struct clk *clk; }; static inline int xgpio_index(struct xgpio_instance *chip, int gpio) @@ -255,6 +259,70 @@ static void xgpio_save_regs(struct xgpio_instance *chip) chip->gpio_dir[1]); } +static int xgpio_request(struct gpio_chip *chip, unsigned int offset) +{ + int ret = pm_runtime_get_sync(chip->parent); + + /* + * If the device is already active pm_runtime_get() will return 1 on + * success, but gpio_request still needs to return 0. + */ + return ret < 0 ? ret : 0; +} + +static void xgpio_free(struct gpio_chip *chip, unsigned int offset) +{ + pm_runtime_put(chip->parent); +} + +static int __maybe_unused xgpio_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int irq = platform_get_irq(pdev, 0); + struct irq_data *data = irq_get_irq_data(irq); + + if (!irqd_is_wakeup_set(data)) + return pm_runtime_force_suspend(dev); + + return 0; +} + +static int __maybe_unused xgpio_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int irq = platform_get_irq(pdev, 0); + struct irq_data *data = irq_get_irq_data(irq); + + if (!irqd_is_wakeup_set(data)) + return pm_runtime_force_resume(dev); + + return 0; +} + +static int __maybe_unused xgpio_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct xgpio_instance *gpio = platform_get_drvdata(pdev); + + clk_disable(gpio->clk); + + return 0; +} + +static int __maybe_unused xgpio_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct xgpio_instance *gpio = platform_get_drvdata(pdev); + + return clk_enable(gpio->clk); +} + +static const struct dev_pm_ops xgpio_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume) + SET_RUNTIME_PM_OPS(xgpio_runtime_suspend, + xgpio_runtime_resume, NULL) +}; + /** * xgpio_of_probe - Probe method for the GPIO device. * @pdev: pointer to the platform device @@ -323,6 +391,8 @@ static int xgpio_probe(struct platform_device *pdev) chip->gc.direction_output = xgpio_dir_out; chip->gc.get = xgpio_get; chip->gc.set = xgpio_set; + chip->gc.request = xgpio_request; + chip->gc.free = xgpio_free; chip->gc.set_multiple = xgpio_set_multiple; chip->gc.label = dev_name(&pdev->dev); @@ -333,15 +403,45 @@ static int xgpio_probe(struct platform_device *pdev) return PTR_ERR(chip->regs); } + chip->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); + if (IS_ERR(chip->clk)) { + if (PTR_ERR(chip->clk) != -ENOENT) { + if (PTR_ERR(chip->clk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Input clock not found\n"); + return PTR_ERR(chip->clk); + } + /* + * Clock framework support is optional, continue on + * anyways if we don't find a matching clock. + */ + chip->clk = NULL; + } + status = clk_prepare_enable(chip->clk); + if (status < 0) { + dev_err(&pdev->dev, "Failed to prepare clk\n"); + return status; + } + pm_runtime_enable(&pdev->dev); + status = pm_runtime_get_sync(&pdev->dev); + if (status < 0) + goto err_unprepare_clk; + xgpio_save_regs(chip); status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip); if (status) { dev_err(&pdev->dev, "failed to add GPIO chip\n"); - return status; + goto err_pm_put; } + pm_runtime_put(&pdev->dev); return 0; +err_pm_put: + pm_runtime_put(&pdev->dev); +err_unprepare_clk: + pm_runtime_disable(&pdev->dev); + clk_unprepare(chip->clk); + return status; } static const struct of_device_id xgpio_of_match[] = { @@ -356,6 +456,7 @@ static struct platform_driver xgpio_plat_driver = { .driver = { .name = "gpio-xilinx", .of_match_table = xgpio_of_match, + .pm = &xgpio_dev_pm_ops, }, };
Add support of clock adaptation for AXI GPIO driver. Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com> --- drivers/gpio/gpio-xilinx.c | 105 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 103 insertions(+), 2 deletions(-)