Merge tag 'pwm/for-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

8d844b35 · Linus Torvalds <[email protected]> · 2023-09-07 18:05:58 -07:00

Pull pwm updates from Thierry Reding:
 "Various cleanups and fixes across the board"

* tag 'pwm/for-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (31 commits)
  pwm: lpc32xx: Remove handling of PWM channels
  pwm: atmel: Simplify using devm functions
  dt-bindings: pwm: brcm,kona-pwm: convert to YAML
  pwm: stmpe: Handle errors when disabling the signal
  pwm: stm32: Simplify using devm_pwmchip_add()
  pwm: stm32: Don't modify HW state in .remove() callback
  pwm: Fix order of freeing resources in pwmchip_remove()
  pwm: ntxec: Use device_set_of_node_from_dev()
  pwm: ntxec: Drop a write-only variable from driver data
  pwm: pxa: Don't reimplement of_device_get_match_data()
  pwm: lpc18xx-sct: Simplify using devm_clk_get_enabled()
  pwm: atmel-tcb: Don't track polarity in driver data
  pwm: atmel-tcb: Unroll atmel_tcb_pwm_set_polarity() into only caller
  pwm: atmel-tcb: Put per-channel data into driver data
  pwm: atmel-tcb: Fix resource freeing in error path and remove
  pwm: atmel-tcb: Harmonize resource allocation order
  pwm: Drop unused #include <linux/radix-tree.h>
  pwm: rz-mtu3: Fix build warning 'num_channel_ios' not described
  pwm: Remove outdated documentation for pwmchip_remove()
  pwm: atmel: Enable clk when pwm already enabled in bootloader
  ...

Commit: 8d844b351824d622fa28bb0cd7a8fecf9aae05ed
Parents: ff6e6ded · 4aae44f6

Merge commit. Changes below are compared with the first parent: ff6e6ded.

Changes

40 files changed · +281 −290

File	Status	Add	Del	Content
Documentation/devicetree/bindings/pwm/brcm,kona-pwm.txt	deleted	+0	−21	View before deletion
Documentation/devicetree/bindings/pwm/brcm,kona-pwm.yaml	added	+51	−0	View file
drivers/pwm/core.c	modified	+19	−22	View file
drivers/pwm/pwm-apple.c	modified	+1	−0	View file
drivers/pwm/pwm-atmel-hlcdc.c	modified	+34	−32	View file
drivers/pwm/pwm-atmel-tcb.c	modified	+48	−75	View file
drivers/pwm/pwm-atmel.c	modified	+50	−27	View file
drivers/pwm/pwm-bcm-kona.c	modified	+2	−2	View file
drivers/pwm/pwm-berlin.c	modified	+1	−0	View file
drivers/pwm/pwm-crc.c	modified	+2	−2	View file
drivers/pwm/pwm-cros-ec.c	modified	+6	−5	View file
drivers/pwm/pwm-fsl-ftm.c	modified	+1	−2	View file
drivers/pwm/pwm-hibvt.c	modified	+1	−1	View file
drivers/pwm/pwm-imx1.c	modified	+0	−1	View file
drivers/pwm/pwm-jz4740.c	modified	+1	−1	View file
drivers/pwm/pwm-lp3943.c	modified	+3	−2	View file
drivers/pwm/pwm-lpc18xx-sct.c	modified	+9	−25	View file
drivers/pwm/pwm-lpc32xx.c	modified	+8	−8	View file
drivers/pwm/pwm-mediatek.c	modified	+0	−1	View file
drivers/pwm/pwm-meson.c	modified	+0	−1	View file
drivers/pwm/pwm-microchip-core.c	modified	+1	−1	View file
drivers/pwm/pwm-mtk-disp.c	modified	+0	−1	View file
drivers/pwm/pwm-ntxec.c	modified	+1	−3	View file
drivers/pwm/pwm-pxa.c	modified	+2	−8	View file
drivers/pwm/pwm-rockchip.c	modified	+2	−2	View file
drivers/pwm/pwm-rz-mtu3.c	modified	+1	−1	View file
drivers/pwm/pwm-sifive.c	modified	+3	−2	View file
drivers/pwm/pwm-sl28cpld.c	modified	+9	−5	View file
drivers/pwm/pwm-sprd.c	modified	+1	−0	View file
drivers/pwm/pwm-stm32.c	modified	+1	−13	View file
drivers/pwm/pwm-stmpe.c	modified	+9	−8	View file
drivers/pwm/pwm-sun4i.c	modified	+0	−1	View file
drivers/pwm/pwm-sunplus.c	modified	+1	−0	View file
drivers/pwm/pwm-tegra.c	modified	+0	−1	View file
drivers/pwm/pwm-tiecap.c	modified	+1	−1	View file
drivers/pwm/pwm-tiehrpwm.c	modified	+1	−1	View file
drivers/pwm/pwm-visconti.c	modified	+1	−1	View file
drivers/pwm/pwm-vt8500.c	modified	+1	−4	View file
drivers/staging/greybus/pwm.c	modified	+6	−6	View file
include/linux/pwm.h	modified	+3	−3	View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/devicetree/bindings/pwm/brcm,kona-pwm.txt

View before deletion

diff --git a/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.txt b/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.txt
deleted file mode 100644
index c42eecf..0000000
--- a/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-Broadcom Kona PWM controller device tree bindings
-
-This controller has 6 channels.
-
-Required Properties :
-- compatible: should contain "brcm,kona-pwm"
-- reg: physical base address and length of the controller's registers
-- clocks: phandle + clock specifier pair for the external clock
-- #pwm-cells: Should be 3. See pwm.yaml in this directory for a
-  description of the cells format.
-
-Refer to clocks/clock-bindings.txt for generic clock consumer properties.
-
-Example:
-
-pwm: pwm@3e01a000 {
-	compatible = "brcm,bcm11351-pwm", "brcm,kona-pwm";
-	reg = <0x3e01a000 0xc4>;
-	clocks = <&pwm_clk>;
-	#pwm-cells = <3>;
-};

Documentation/devicetree/bindings/pwm/brcm,kona-pwm.yaml

View file

diff --git a/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.yaml b/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.yaml
new file mode 100644
index 0000000..e86c805
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/brcm,kona-pwm.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/brcm,kona-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom Kona family PWM controller
+
+description:
+  This controller has 6 channels.
+
+maintainers:
+  - Florian Fainelli <[email protected]>
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - brcm,bcm11351-pwm
+      - const: brcm,kona-pwm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  '#pwm-cells':
+    const: 3
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/bcm281xx.h>
+
+    pwm@3e01a000 {
+       compatible = "brcm,bcm11351-pwm", "brcm,kona-pwm";
+       reg = <0x3e01a000 0xcc>;
+       clocks = <&slave_ccu BCM281XX_SLAVE_CCU_PWM>;
+       #pwm-cells = <3>;
+    };
+...

drivers/pwm/core.c

View file

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3daccea..dc66e34 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -8,8 +8,8 @@
 
 #include <linux/acpi.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/pwm.h>
-#include <linux/radix-tree.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/err.h>
@@ -127,28 +127,28 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 }
 
 struct pwm_device *
-of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
+of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *args)
 {
 	struct pwm_device *pwm;
 
-	if (pc->of_pwm_n_cells < 2)
+	if (chip->of_pwm_n_cells < 2)
 		return ERR_PTR(-EINVAL);
 
 	/* flags in the third cell are optional */
 	if (args->args_count < 2)
 		return ERR_PTR(-EINVAL);
 
-	if (args->args[0] >= pc->npwm)
+	if (args->args[0] >= chip->npwm)
 		return ERR_PTR(-EINVAL);
 
-	pwm = pwm_request_from_chip(pc, args->args[0], NULL);
+	pwm = pwm_request_from_chip(chip, args->args[0], NULL);
 	if (IS_ERR(pwm))
 		return pwm;
 
 	pwm->args.period = args->args[1];
 	pwm->args.polarity = PWM_POLARITY_NORMAL;
 
-	if (pc->of_pwm_n_cells >= 3) {
+	if (chip->of_pwm_n_cells >= 3) {
 		if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
 			pwm->args.polarity = PWM_POLARITY_INVERSED;
 	}
@@ -158,18 +158,18 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
 EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
 
 struct pwm_device *
-of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
+of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
 {
 	struct pwm_device *pwm;
 
-	if (pc->of_pwm_n_cells < 1)
+	if (chip->of_pwm_n_cells < 1)
 		return ERR_PTR(-EINVAL);
 
 	/* validate that one cell is specified, optionally with flags */
 	if (args->args_count != 1 && args->args_count != 2)
 		return ERR_PTR(-EINVAL);
 
-	pwm = pwm_request_from_chip(pc, 0, NULL);
+	pwm = pwm_request_from_chip(chip, 0, NULL);
 	if (IS_ERR(pwm))
 		return pwm;
 
@@ -312,22 +312,19 @@ EXPORT_SYMBOL_GPL(pwmchip_add);
  * pwmchip_remove() - remove a PWM chip
  * @chip: the PWM chip to remove
  *
- * Removes a PWM chip. This function may return busy if the PWM chip provides
- * a PWM device that is still requested.
- *
- * Returns: 0 on success or a negative error code on failure.
+ * Removes a PWM chip.
  */
 void pwmchip_remove(struct pwm_chip *chip)
 {
 	pwmchip_sysfs_unexport(chip);
 
+	if (IS_ENABLED(CONFIG_OF))
+		of_pwmchip_remove(chip);
+
 	mutex_lock(&pwm_lock);
 
 	list_del_init(&chip->list);
 
-	if (IS_ENABLED(CONFIG_OF))
-		of_pwmchip_remove(chip);
-
 	free_pwms(chip);
 
 	mutex_unlock(&pwm_lock);
@@ -692,7 +689,7 @@ static struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
 	struct pwm_device *pwm = NULL;
 	struct of_phandle_args args;
 	struct device_link *dl;
-	struct pwm_chip *pc;
+	struct pwm_chip *chip;
 	int index = 0;
 	int err;
 
@@ -709,16 +706,16 @@ static struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
 		return ERR_PTR(err);
 	}
 
-	pc = fwnode_to_pwmchip(of_fwnode_handle(args.np));
-	if (IS_ERR(pc)) {
-		if (PTR_ERR(pc) != -EPROBE_DEFER)
+	chip = fwnode_to_pwmchip(of_fwnode_handle(args.np));
+	if (IS_ERR(chip)) {
+		if (PTR_ERR(chip) != -EPROBE_DEFER)
 			pr_err("%s(): PWM chip not found\n", __func__);
 
-		pwm = ERR_CAST(pc);
+		pwm = ERR_CAST(chip);
 		goto put;
 	}
 
-	pwm = pc->of_xlate(pc, &args);
+	pwm = chip->of_xlate(chip, &args);
 	if (IS_ERR(pwm))
 		goto put;
 

drivers/pwm/pwm-apple.c

View file

diff --git a/drivers/pwm/pwm-apple.c b/drivers/pwm/pwm-apple.c
index a38a62e..8e7d67f 100644
--- a/drivers/pwm/pwm-apple.c
+++ b/drivers/pwm/pwm-apple.c
@@ -12,6 +12,7 @@
  * - When APPLE_PWM_CTRL is set to 0, the output is constant low
  */
 
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>

drivers/pwm/pwm-atmel-hlcdc.c

View file

diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index 96a709a..e271d92 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 #include <linux/mfd/atmel-hlcdc.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 #include <linux/regmap.h>
@@ -38,11 +39,11 @@ static inline struct atmel_hlcdc_pwm *to_atmel_hlcdc_pwm(struct pwm_chip *chip)
 	return container_of(chip, struct atmel_hlcdc_pwm, chip);
 }
 
-static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
+static int atmel_hlcdc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 				 const struct pwm_state *state)
 {
-	struct atmel_hlcdc_pwm *chip = to_atmel_hlcdc_pwm(c);
-	struct atmel_hlcdc *hlcdc = chip->hlcdc;
+	struct atmel_hlcdc_pwm *atmel = to_atmel_hlcdc_pwm(chip);
+	struct atmel_hlcdc *hlcdc = atmel->hlcdc;
 	unsigned int status;
 	int ret;
 
@@ -54,7 +55,7 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 		u32 pwmcfg;
 		int pres;
 
-		if (!chip->errata || !chip->errata->slow_clk_erratum) {
+		if (!atmel->errata || !atmel->errata->slow_clk_erratum) {
 			clk_freq = clk_get_rate(new_clk);
 			if (!clk_freq)
 				return -EINVAL;
@@ -64,7 +65,7 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 		}
 
 		/* Errata: cannot use slow clk on some IP revisions */
-		if ((chip->errata && chip->errata->slow_clk_erratum) ||
+		if ((atmel->errata && atmel->errata->slow_clk_erratum) ||
 		    clk_period_ns > state->period) {
 			new_clk = hlcdc->sys_clk;
 			clk_freq = clk_get_rate(new_clk);
@@ -77,8 +78,8 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 
 		for (pres = 0; pres <= ATMEL_HLCDC_PWMPS_MAX; pres++) {
 		/* Errata: cannot divide by 1 on some IP revisions */
-			if (!pres && chip->errata &&
-			    chip->errata->div1_clk_erratum)
+			if (!pres && atmel->errata &&
+			    atmel->errata->div1_clk_erratum)
 				continue;
 
 			if ((clk_period_ns << pres) >= state->period)
@@ -90,7 +91,7 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 
 		pwmcfg = ATMEL_HLCDC_PWMPS(pres);
 
-		if (new_clk != chip->cur_clk) {
+		if (new_clk != atmel->cur_clk) {
 			u32 gencfg = 0;
 			int ret;
 
@@ -98,8 +99,8 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 			if (ret)
 				return ret;
 
-			clk_disable_unprepare(chip->cur_clk);
-			chip->cur_clk = new_clk;
+			clk_disable_unprepare(atmel->cur_clk);
+			atmel->cur_clk = new_clk;
 
 			if (new_clk == hlcdc->sys_clk)
 				gencfg = ATMEL_HLCDC_CLKPWMSEL;
@@ -160,8 +161,8 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
 		if (ret)
 			return ret;
 
-		clk_disable_unprepare(chip->cur_clk);
-		chip->cur_clk = NULL;
+		clk_disable_unprepare(atmel->cur_clk);
+		atmel->cur_clk = NULL;
 	}
 
 	return 0;
@@ -183,31 +184,32 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
 #ifdef CONFIG_PM_SLEEP
 static int atmel_hlcdc_pwm_suspend(struct device *dev)
 {
-	struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
 
 	/* Keep the periph clock enabled if the PWM is still running. */
-	if (pwm_is_enabled(&chip->chip.pwms[0]))
-		clk_disable_unprepare(chip->hlcdc->periph_clk);
+	if (pwm_is_enabled(&atmel->chip.pwms[0]))
+		clk_disable_unprepare(atmel->hlcdc->periph_clk);
 
 	return 0;
 }
 
 static int atmel_hlcdc_pwm_resume(struct device *dev)
 {
-	struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
 	struct pwm_state state;
 	int ret;
 
-	pwm_get_state(&chip->chip.pwms[0], &state);
+	pwm_get_state(&atmel->chip.pwms[0], &state);
 
 	/* Re-enable the periph clock it was stopped during suspend. */
 	if (!state.enabled) {
-		ret = clk_prepare_enable(chip->hlcdc->periph_clk);
+		ret = clk_prepare_enable(atmel->hlcdc->periph_clk);
 		if (ret)
 			return ret;
 	}
 
-	return atmel_hlcdc_pwm_apply(&chip->chip, &chip->chip.pwms[0], &state);
+	return atmel_hlcdc_pwm_apply(&atmel->chip, &atmel->chip.pwms[0],
+				     &state);
 }
 #endif
 
@@ -244,14 +246,14 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	struct device *dev = &pdev->dev;
-	struct atmel_hlcdc_pwm *chip;
+	struct atmel_hlcdc_pwm *atmel;
 	struct atmel_hlcdc *hlcdc;
 	int ret;
 
 	hlcdc = dev_get_drvdata(dev->parent);
 
-	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
+	atmel = devm_kzalloc(dev, sizeof(*atmel), GFP_KERNEL);
+	if (!atmel)
 		return -ENOMEM;
 
 	ret = clk_prepare_enable(hlcdc->periph_clk);
@@ -260,31 +262,31 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 
 	match = of_match_node(atmel_hlcdc_dt_ids, dev->parent->of_node);
 	if (match)
-		chip->errata = match->data;
+		atmel->errata = match->data;
 
-	chip->hlcdc = hlcdc;
-	chip->chip.ops = &atmel_hlcdc_pwm_ops;
-	chip->chip.dev = dev;
-	chip->chip.npwm = 1;
+	atmel->hlcdc = hlcdc;
+	atmel->chip.ops = &atmel_hlcdc_pwm_ops;
+	atmel->chip.dev = dev;
+	atmel->chip.npwm = 1;
 
-	ret = pwmchip_add(&chip->chip);
+	ret = pwmchip_add(&atmel->chip);
 	if (ret) {
 		clk_disable_unprepare(hlcdc->periph_clk);
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, chip);
+	platform_set_drvdata(pdev, atmel);
 
 	return 0;
 }
 
 static void atmel_hlcdc_pwm_remove(struct platform_device *pdev)
 {
-	struct atmel_hlcdc_pwm *chip = platform_get_drvdata(pdev);
+	struct atmel_hlcdc_pwm *atmel = platform_get_drvdata(pdev);
 
-	pwmchip_remove(&chip->chip);
+	pwmchip_remove(&atmel->chip);
 
-	clk_disable_unprepare(chip->hlcdc->periph_clk);
+	clk_disable_unprepare(atmel->hlcdc->periph_clk);
 }
 
 static const struct of_device_id atmel_hlcdc_pwm_dt_ids[] = {

drivers/pwm/pwm-atmel-tcb.c

View file

diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 4a116dc..c00dd37 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -19,8 +19,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
-#include <linux/of_device.h>
-#include <linux/of_irq.h>
+#include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <soc/at91/atmel_tcb.h>
@@ -34,7 +33,6 @@
 				 ATMEL_TC_BEEVT | ATMEL_TC_BSWTRG)
 
 struct atmel_tcb_pwm_device {
-	enum pwm_polarity polarity;	/* PWM polarity */
 	unsigned div;			/* PWM clock divider */
 	unsigned duty;			/* PWM duty expressed in clk cycles */
 	unsigned period;		/* PWM period expressed in clk cycles */
@@ -57,7 +55,7 @@ struct atmel_tcb_pwm_chip {
 	struct clk *clk;
 	struct clk *gclk;
 	struct clk *slow_clk;
-	struct atmel_tcb_pwm_device *pwms[NPWM];
+	struct atmel_tcb_pwm_device pwms[NPWM];
 	struct atmel_tcb_channel bkup;
 };
 
@@ -68,37 +66,18 @@ static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
 	return container_of(chip, struct atmel_tcb_pwm_chip, chip);
 }
 
-static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
-				      struct pwm_device *pwm,
-				      enum pwm_polarity polarity)
-{
-	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
-
-	tcbpwm->polarity = polarity;
-
-	return 0;
-}
-
 static int atmel_tcb_pwm_request(struct pwm_chip *chip,
 				 struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm;
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	unsigned cmr;
 	int ret;
 
-	tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL);
-	if (!tcbpwm)
-		return -ENOMEM;
-
 	ret = clk_prepare_enable(tcbpwmc->clk);
-	if (ret) {
-		devm_kfree(chip->dev, tcbpwm);
+	if (ret)
 		return ret;
-	}
 
-	tcbpwm->polarity = PWM_POLARITY_NORMAL;
 	tcbpwm->duty = 0;
 	tcbpwm->period = 0;
 	tcbpwm->div = 0;
@@ -131,27 +110,22 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
 	regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
 	spin_unlock(&tcbpwmc->lock);
 
-	tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
-
 	return 0;
 }
 
 static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
 
 	clk_disable_unprepare(tcbpwmc->clk);
-	tcbpwmc->pwms[pwm->hwpwm] = NULL;
-	devm_kfree(chip->dev, tcbpwm);
 }
 
-static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm,
+				  enum pwm_polarity polarity)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	unsigned cmr;
-	enum pwm_polarity polarity = tcbpwm->polarity;
 
 	/*
 	 * If duty is 0 the timer will be stopped and we have to
@@ -203,12 +177,12 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	spin_unlock(&tcbpwmc->lock);
 }
 
-static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm,
+				enum pwm_polarity polarity)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	u32 cmr;
-	enum pwm_polarity polarity = tcbpwm->polarity;
 
 	/*
 	 * If duty is 0 the timer will be stopped and we have to
@@ -291,7 +265,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 				int duty_ns, int period_ns)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	struct atmel_tcb_pwm_device *atcbpwm = NULL;
 	int i = 0;
 	int slowclk = 0;
@@ -338,9 +312,9 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	period = div_u64(period_ns, min);
 
 	if (pwm->hwpwm == 0)
-		atcbpwm = tcbpwmc->pwms[1];
+		atcbpwm = &tcbpwmc->pwms[1];
 	else
-		atcbpwm = tcbpwmc->pwms[0];
+		atcbpwm = &tcbpwmc->pwms[0];
 
 	/*
 	 * PWM devices provided by the TCB driver are grouped by 2.
@@ -371,11 +345,8 @@ static int atmel_tcb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	int duty_cycle, period;
 	int ret;
 
-	/* This function only sets a flag in driver data */
-	atmel_tcb_pwm_set_polarity(chip, pwm, state->polarity);
-
 	if (!state->enabled) {
-		atmel_tcb_pwm_disable(chip, pwm);
+		atmel_tcb_pwm_disable(chip, pwm, state->polarity);
 		return 0;
 	}
 
@@ -386,7 +357,7 @@ static int atmel_tcb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (ret)
 		return ret;
 
-	return atmel_tcb_pwm_enable(chip, pwm);
+	return atmel_tcb_pwm_enable(chip, pwm, state->polarity);
 }
 
 static const struct pwm_ops atmel_tcb_pwm_ops = {
@@ -422,13 +393,14 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 	struct atmel_tcb_pwm_chip *tcbpwm;
 	const struct atmel_tcb_config *config;
 	struct device_node *np = pdev->dev.of_node;
-	struct regmap *regmap;
-	struct clk *clk, *gclk = NULL;
-	struct clk *slow_clk;
 	char clk_name[] = "t0_clk";
 	int err;
 	int channel;
 
+	tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
+	if (tcbpwm == NULL)
+		return -ENOMEM;
+
 	err = of_property_read_u32(np, "reg", &channel);
 	if (err < 0) {
 		dev_err(&pdev->dev,
@@ -437,49 +409,43 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	regmap = syscon_node_to_regmap(np->parent);
-	if (IS_ERR(regmap))
-		return PTR_ERR(regmap);
+	tcbpwm->regmap = syscon_node_to_regmap(np->parent);
+	if (IS_ERR(tcbpwm->regmap))
+		return PTR_ERR(tcbpwm->regmap);