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pwm: renesas-tpu: Add DT support

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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>
This commit is contained in:
Laurent Pinchart 2013-07-26 00:27:41 +02:00 committed by Thierry Reding
parent eb9bdef111
commit 382457e562
2 changed files with 62 additions and 7 deletions
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28
Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt Normal file
View file

@ -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>;
};

41
drivers/pwm/pwm-renesas-tpu.c
View file

@ -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),
}
};