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