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>
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 0000000..b067e84
--- /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 2600892..3eeffff 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_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 @@
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 @@
* 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 @@
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 @@
/* 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 @@
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),
}
};