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Commit 382457e5 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Thierry Reding
Browse files

pwm: renesas-tpu: Add DT support 



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

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent eb9bdef1

Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.txt

0 → 100644
+28 −0
Original line number Diff line number Diff line 
* 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>;

	};

drivers/pwm/pwm-renesas-tpu.c

+34 −7
Original line number Diff line number Diff line
@@ -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),

	}

};