[PATCHv5 2/3] pwm: make the PWM_POLARITY flag in DTB optional

["Lothar Waßmann" <LW@KARO-electronics.de>]

Change the pwm chip driver registration, so that a chip driver that
supports polarity inversion can still be used with DTBs that don't
provide the 'PWM_POLARITY' flag.

This is done to provide polarity inversion support for the pwm-imx
driver without having to modify all existing DTS files.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/pwm/core.c            |   18 ++++++------------
 drivers/pwm/pwm-atmel-tcb.c   |    1 -
 drivers/pwm/pwm-atmel.c       |    4 +---
 drivers/pwm/pwm-pxa.c         |    5 ++---
 drivers/pwm/pwm-renesas-tpu.c |    1 -
 drivers/pwm/pwm-samsung.c     |    1 -
 drivers/pwm/pwm-tiecap.c      |    1 -
 drivers/pwm/pwm-tiehrpwm.c    |    1 -
 drivers/pwm/pwm-vt8500.c      |    1 -
 include/linux/pwm.h           |    1 -
 10 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 130bbea..ae1596f 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -136,7 +136,7 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
 {
 	struct pwm_device *pwm;
 
-	if (pc->of_pwm_n_cells < 3)
+	if (args->args_count != 3)
 		return ERR_PTR(-EINVAL);
 
 	if (args->args[0] >= pc->npwm)
@@ -162,12 +162,15 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
 {
 	struct pwm_device *pwm;
 
-	if (pc->of_pwm_n_cells < 2)
+	if (args->args_count < 2)
 		return ERR_PTR(-EINVAL);
 
 	if (args->args[0] >= pc->npwm)
 		return ERR_PTR(-EINVAL);
 
+	if (args->args_count > 2)
+		return of_pwm_xlate_with_flags(pc, args);
+
 	pwm = pwm_request_from_chip(pc, args->args[0], NULL);
 	if (IS_ERR(pwm))
 		return pwm;
@@ -182,10 +185,8 @@ static void of_pwmchip_add(struct pwm_chip *chip)
 	if (!chip->dev || !chip->dev->of_node)
 		return;
 
-	if (!chip->of_xlate) {
+	if (!chip->of_xlate)
 		chip->of_xlate = of_pwm_simple_xlate;
-		chip->of_pwm_n_cells = 2;
-	}
 
 	of_node_get(chip->dev->of_node);
 }
@@ -536,13 +537,6 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
 		goto put;
 	}
 
-	if (args.args_count != pc->of_pwm_n_cells) {
-		pr_debug("%s: wrong #pwm-cells for %s\n", np->full_name,
-			 args.np->full_name);
-		pwm = ERR_PTR(-EINVAL);
-		goto put;
-	}
-
 	pwm = pc->of_xlate(pc, &args);
 	if (IS_ERR(pwm))
 		goto put;
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index d56e5b7..8ffa460 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -395,7 +395,6 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 	tcbpwm->chip.dev = &pdev->dev;
 	tcbpwm->chip.ops = &atmel_tcb_pwm_ops;
 	tcbpwm->chip.of_xlate = of_pwm_xlate_with_flags;
-	tcbpwm->chip.of_pwm_n_cells = 3;
 	tcbpwm->chip.base = -1;
 	tcbpwm->chip.npwm = NPWM;
 	tcbpwm->tc = tc;
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index d3c22de..394c54f 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -348,10 +348,8 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	atmel_pwm->chip.dev = &pdev->dev;
 	atmel_pwm->chip.ops = &atmel_pwm_ops;
 
-	if (pdev->dev.of_node) {
+	if (pdev->dev.of_node)
 		atmel_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
-		atmel_pwm->chip.of_pwm_n_cells = 3;
-	}
 
 	atmel_pwm->chip.base = -1;
 	atmel_pwm->chip.npwm = 4;
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 0b312ec..56560529 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -191,10 +191,9 @@ static int pwm_probe(struct platform_device *pdev)
 	pwm->chip.base = -1;
 	pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
 
-	if (IS_ENABLED(CONFIG_OF)) {
+	if (IS_ENABLED(CONFIG_OF))
 		pwm->chip.of_xlate = pxa_pwm_of_xlate;
-		pwm->chip.of_pwm_n_cells = 1;
-	}
+
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r);
diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
index 3b71b42..5271da3 100644
--- a/drivers/pwm/pwm-renesas-tpu.c
+++ b/drivers/pwm/pwm-renesas-tpu.c
@@ -419,7 +419,6 @@ static int tpu_probe(struct platform_device *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;
 
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index ba6b650..317d7d1 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -484,7 +484,6 @@ static int pwm_samsung_probe(struct platform_device *pdev)
 			return ret;
 
 		chip->chip.of_xlate = of_pwm_xlate_with_flags;
-		chip->chip.of_pwm_n_cells = 3;
 	} else {
 		if (!pdev->dev.platform_data) {
 			dev_err(&pdev->dev, "no platform data specified\n");
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 74efbe7..a8e8282 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -227,7 +227,6 @@ static int ecap_pwm_probe(struct platform_device *pdev)
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &ecap_pwm_ops;
 	pc->chip.of_xlate = of_pwm_xlate_with_flags;
-	pc->chip.of_pwm_n_cells = 3;
 	pc->chip.base = -1;
 	pc->chip.npwm = 1;
 
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index cb75133..12a8ae4 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -458,7 +458,6 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &ehrpwm_pwm_ops;
 	pc->chip.of_xlate = of_pwm_xlate_with_flags;
-	pc->chip.of_pwm_n_cells = 3;
 	pc->chip.base = -1;
 	pc->chip.npwm = NUM_PWM_CHANNEL;
 
diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
index 652e6b5..e04a3c0 100644
--- a/drivers/pwm/pwm-vt8500.c
+++ b/drivers/pwm/pwm-vt8500.c
@@ -217,7 +217,6 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
 	chip->chip.dev = &pdev->dev;
 	chip->chip.ops = &vt8500_pwm_ops;
 	chip->chip.of_xlate = of_pwm_xlate_with_flags;
-	chip->chip.of_pwm_n_cells = 3;
 	chip->chip.base = -1;
 	chip->chip.npwm = VT8500_NR_PWMS;
 
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e90628c..4cf1569 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -174,7 +174,6 @@ struct pwm_chip {
 
 	struct pwm_device *	(*of_xlate)(struct pwm_chip *pc,
 					    const struct of_phandle_args *args);
-	unsigned int		of_pwm_n_cells;
 	bool			can_sleep;
 };
 
-- 
1.7.10.4