diff options
| -rw-r--r-- | Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt | 28 | ||||
| -rw-r--r-- | drivers/pwm/pwm-renesas-tpu.c | 41 |
2 files changed, 62 insertions, 7 deletions
diff --git a/Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt b/Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt new file mode 100644 index 000000000000..b067e84a94b5 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt @@ -0,0 +1,28 @@ +* Renesas R-Car Timer Pulse Unit PWM Controller + +Required Properties: + + - compatible: should be one of the following. + - "renesas,tpu-r8a73a4": for R8A77A4 (R-Mobile APE6) compatible PWM controller. + - "renesas,tpu-r8a7740": for R8A7740 (R-Mobile A1) compatible PWM controller. + - "renesas,tpu-r8a7790": for R8A7790 (R-Car H2) compatible PWM controller. + - "renesas,tpu-sh7372": for SH7372 (SH-Mobile AP4) compatible PWM controller. + - "renesas,tpu": for generic R-Car TPU PWM controller. + + - reg: Base address and length of each memory resource used by the PWM + controller hardware module. + + - #pwm-cells: should be 3. See pwm.txt in this directory for a description of + the cells format. The only third cell flag supported by this binding is + PWM_POLARITY_INVERTED. + +Please refer to pwm.txt in this directory for details of the common PWM bindings +used by client devices. + +Example: R8A7740 (R-Car A1) TPU controller node + + tpu: pwm@e6600000 { + compatible = "renesas,tpu-r8a7740", "renesas,tpu"; + reg = <0xe6600000 0x100>; + #pwm-cells = <3>; + }; diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c index 2600892782c1..3eeffff69280 100644 --- a/drivers/pwm/pwm-renesas-tpu.c +++ b/drivers/pwm/pwm-renesas-tpu.c @@ -20,6 +20,7 @@ #include <linux/ioport.h> #include <linux/module.h> #include <linux/mutex.h> +#include <linux/of.h> #include <linux/platform_data/pwm-renesas-tpu.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> @@ -86,7 +87,7 @@ struct tpu_pwm_device { struct tpu_device { struct platform_device *pdev; - struct tpu_pwm_platform_data *pdata; + enum pwm_polarity polarities[TPU_CHANNEL_MAX]; struct pwm_chip chip; spinlock_t lock; @@ -228,8 +229,7 @@ static int tpu_pwm_request(struct pwm_chip *chip, struct pwm_device *_pwm) pwm->tpu = tpu; pwm->channel = _pwm->hwpwm; - pwm->polarity = tpu->pdata ? tpu->pdata->channels[pwm->channel].polarity - : PWM_POLARITY_NORMAL; + pwm->polarity = tpu->polarities[pwm->channel]; pwm->prescaler = 0; pwm->period = 0; pwm->duty = 0; @@ -388,6 +388,16 @@ static const struct pwm_ops tpu_pwm_ops = { * Probe and remove */ +static void tpu_parse_pdata(struct tpu_device *tpu) +{ + struct tpu_pwm_platform_data *pdata = tpu->pdev->dev.platform_data; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(tpu->polarities); ++i) + tpu->polarities[i] = pdata ? pdata->channels[i].polarity + : PWM_POLARITY_NORMAL; +} + static int tpu_probe(struct platform_device *pdev) { struct tpu_device *tpu; @@ -400,7 +410,11 @@ static int tpu_probe(struct platform_device *pdev) return -ENOMEM; } - tpu->pdata = pdev->dev.platform_data; + spin_lock_init(&tpu->lock); + tpu->pdev = pdev; + + /* Initialize device configuration from platform data. */ + tpu_parse_pdata(tpu); /* Map memory, get clock and pin control. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -422,11 +436,10 @@ static int tpu_probe(struct platform_device *pdev) /* Initialize and register the device. */ platform_set_drvdata(pdev, tpu); - spin_lock_init(&tpu->lock); - tpu->pdev = pdev; - tpu->chip.dev = &pdev->dev; tpu->chip.ops = &tpu_pwm_ops; + tpu->chip.of_xlate = of_pwm_xlate_with_flags; + tpu->chip.of_pwm_n_cells = 3; tpu->chip.base = -1; tpu->chip.npwm = TPU_CHANNEL_MAX; @@ -457,12 +470,26 @@ static int tpu_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_OF +static const struct of_device_id tpu_of_table[] = { + { .compatible = "renesas,tpu-r8a73a4", }, + { .compatible = "renesas,tpu-r8a7740", }, + { .compatible = "renesas,tpu-r8a7790", }, + { .compatible = "renesas,tpu-sh7372", }, + { .compatible = "renesas,tpu", }, + { }, +}; + +MODULE_DEVICE_TABLE(of, tpu_of_table); +#endif + static struct platform_driver tpu_driver = { .probe = tpu_probe, .remove = tpu_remove, .driver = { .name = "renesas-tpu-pwm", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(tpu_of_table), } }; |