pwm: renesas-tpu: Add DT support

Specify DT bindings for the TPU PWM controller and add OF support to the
driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 34 insertions, 7 deletions

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),
         }
 };