build/patch/kernel/mvebu-next/92-mvebu-gpio-remove-hardcoded-timer-assignment.patch

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index 45c65f8..2ec4a15 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -93,20 +93,41 @@
 
 #define MVEBU_MAX_GPIO_PER_BANK		32
 
-struct mvebu_pwm {
+enum mvebu_pwm_ctrl {
+	MVEBU_PWM_CTRL_SET_A = 0,
+	MVEBU_PWM_CTRL_SET_B,
+	MVEBU_PWM_CTRL_MAX
+};
+
+struct mvebu_pwmchip {
 	void __iomem		*membase;
 	unsigned long		 clk_rate;
+	spinlock_t		 lock;
+	bool			 in_use;
+
+	/* Used to preserve GPIO/PWM registers across suspend/resume */
+	u32			 blink_on_duration;
+	u32			 blink_off_duration;
+};
+
+struct mvebu_pwm_chip_drv {
+	enum mvebu_pwm_ctrl	ctrl;
 	struct gpio_desc	*gpiod;
+	bool			master;
+};
+
+struct mvebu_pwm {
 	struct pwm_chip		 chip;
-	spinlock_t		 lock;
 	struct mvebu_gpio_chip	*mvchip;
+	struct mvebu_pwmchip     controller;
+	enum mvebu_pwm_ctrl	 default_counter;
 
 	/* Used to preserve GPIO/PWM registers across suspend/resume */
 	u32			 blink_select;
-	u32			 blink_on_duration;
-	u32			 blink_off_duration;
 };
 
+static struct mvebu_pwmchip	*mvebu_pwm_list[MVEBU_PWM_CTRL_MAX];
+
 struct mvebu_gpio_chip {
 	struct gpio_chip   chip;
 	struct regmap     *regs;
@@ -283,12 +304,12 @@ mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val)
  * Functions returning addresses of individual registers for a given
  * PWM controller.
  */
-static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
+static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwmchip *mvpwm)
 {
 	return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF;
 }
 
-static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm)
+static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwmchip *mvpwm)
 {
 	return mvpwm->membase + PWM_BLINK_OFF_DURATION_OFF;
 }
@@ -600,46 +621,80 @@ static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
 	struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
 	struct gpio_desc *desc;
+	enum mvebu_pwm_ctrl id;
 	unsigned long flags;
 	int ret = 0;
+	struct mvebu_pwm_chip_drv *chip_data;
 
-	spin_lock_irqsave(&mvpwm->lock, flags);
+	spin_lock_irqsave(&mvpwm->controller.lock, flags);
 
-	if (mvpwm->gpiod) {
-		ret = -EBUSY;
-	} else {
-		desc = gpio_to_desc(mvchip->chip.base + pwm->hwpwm);
-		if (!desc) {
-			ret = -ENODEV;
-			goto out;
-		}
+	regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
+		    &mvchip->blink_en_reg);
+	if (pwm->chip_data || (mvchip->blink_en_reg & BIT(pwm->hwpwm)))
+		return -EBUSY;
 
-		ret = gpiod_request(desc, "mvebu-pwm");
-		if (ret)
-			goto out;
+	desc = gpio_to_desc(mvchip->chip.base + pwm->hwpwm);
+	if (!desc) {
+		ret = -ENODEV;
+		goto out;
+	}
 
-		ret = gpiod_direction_output(desc, 0);
-		if (ret) {
-			gpiod_free(desc);
-			goto out;
-		}
+	ret = gpiod_request(desc, "mvebu-pwm");
+	if (ret)
+		goto out;
 
-		mvpwm->gpiod = desc;
+	ret = gpiod_direction_output(desc, 0);
+	if (ret) {
+		gpiod_free(desc);
+		goto out;
 	}
+
+	chip_data = kzalloc(sizeof(struct mvebu_pwm_chip_drv), GFP_KERNEL);
+	if (!chip_data) {
+		gpiod_free(desc);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	for (id = MVEBU_PWM_CTRL_SET_A;id < MVEBU_PWM_CTRL_MAX; id++) {
+		if (!mvebu_pwm_list[id]->in_use) {
+			chip_data->ctrl   = id;
+			chip_data->master = true;
+			mvebu_pwm_list[id]->in_use = true;
+			break;
+		}
+	}
+
+	if (!chip_data->master)
+		chip_data->ctrl = mvpwm->default_counter;
+
+	regmap_update_bits(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
+				BIT(pwm->hwpwm), chip_data->ctrl ? BIT(pwm->hwpwm) : 0);
+
+	chip_data->gpiod = desc;
+	pwm->chip_data = chip_data;
+
+	regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
+		    &mvpwm->blink_select);
 out:
-	spin_unlock_irqrestore(&mvpwm->lock, flags);
+	spin_unlock_irqrestore(&mvpwm->controller.lock, flags);
 	return ret;
 }
 
 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
+	struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data;
 	unsigned long flags;
 
-	spin_lock_irqsave(&mvpwm->lock, flags);
-	gpiod_free(mvpwm->gpiod);
-	mvpwm->gpiod = NULL;
-	spin_unlock_irqrestore(&mvpwm->lock, flags);
+	spin_lock_irqsave(&mvpwm->controller.lock, flags);
+	if (chip_data->master)
+		mvebu_pwm_list[chip_data->ctrl]->in_use = false;
+
+	gpiod_free(chip_data->gpiod);
+	kfree(chip_data);
+	pwm->chip_data = NULL;
+	spin_unlock_irqrestore(&mvpwm->controller.lock, flags);
 }
 
 static void mvebu_pwm_get_state(struct pwm_chip *chip,
@@ -647,17 +702,24 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip,
 				struct pwm_state *state) {
 
 	struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
+	struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data;
+	struct mvebu_pwmchip *controller;
 	struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
 	unsigned long long val;
 	unsigned long flags;
 	u32 u;
 
-	spin_lock_irqsave(&mvpwm->lock, flags);
+	if (chip_data)
+		controller = mvebu_pwm_list[chip_data->ctrl];
+	else
+		controller = &mvpwm->controller;
+
+	spin_lock_irqsave(&controller->lock, flags);
 
 	val = (unsigned long long)
-		readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
+		readl_relaxed(mvebu_pwmreg_blink_on_duration(controller));
 	val *= NSEC_PER_SEC;
-	do_div(val, mvpwm->clk_rate);
+	do_div(val, controller->clk_rate);
 	if (val > UINT_MAX)
 		state->duty_cycle = UINT_MAX;
 	else if (val)
@@ -666,9 +728,9 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip,
 		state->duty_cycle = 1;
 
 	val = (unsigned long long)
-		readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
+		readl_relaxed(mvebu_pwmreg_blink_off_duration(controller));
 	val *= NSEC_PER_SEC;
-	do_div(val, mvpwm->clk_rate);
+	do_div(val, controller->clk_rate);
 	if (val < state->duty_cycle) {
 		state->period = 1;
 	} else {
@@ -687,19 +749,21 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip,
 	else
 		state->enabled = false;
 
-	spin_unlock_irqrestore(&mvpwm->lock, flags);
+	spin_unlock_irqrestore(&controller->lock, flags);
 }
 
 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			   struct pwm_state *state)
 {
 	struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
+	struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data;
+	struct mvebu_pwmchip *controller = mvebu_pwm_list[chip_data->ctrl];
 	struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
 	unsigned long long val;
 	unsigned long flags;
 	unsigned int on, off;
 
-	val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
+	val = (unsigned long long) controller->clk_rate * state->duty_cycle;
 	do_div(val, NSEC_PER_SEC);
 	if (val > UINT_MAX)
 		return -EINVAL;
@@ -708,7 +772,7 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	else
 		on = 1;
 
-	val = (unsigned long long) mvpwm->clk_rate *
+	val = (unsigned long long) controller->clk_rate *
 		(state->period - state->duty_cycle);
 	do_div(val, NSEC_PER_SEC);
 	if (val > UINT_MAX)
@@ -718,16 +782,16 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	else
 		off = 1;
 
-	spin_lock_irqsave(&mvpwm->lock, flags);
+	spin_lock_irqsave(&controller->lock, flags);
 
-	writel_relaxed(on, mvebu_pwmreg_blink_on_duration(mvpwm));
-	writel_relaxed(off, mvebu_pwmreg_blink_off_duration(mvpwm));
+	writel_relaxed(on, mvebu_pwmreg_blink_on_duration(controller));
+	writel_relaxed(off, mvebu_pwmreg_blink_off_duration(controller));
 	if (state->enabled)
 		mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1);
 	else
 		mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0);
 
-	spin_unlock_irqrestore(&mvpwm->lock, flags);
+	spin_unlock_irqrestore(&controller->lock, flags);
 
 	return 0;
 }
@@ -746,10 +810,10 @@ static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
 
 	regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
 		    &mvpwm->blink_select);
-	mvpwm->blink_on_duration =
-		readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
-	mvpwm->blink_off_duration =
-		readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
+	mvpwm->controller.blink_on_duration =
+		readl_relaxed(mvebu_pwmreg_blink_on_duration(&mvpwm->controller));
+	mvpwm->controller.blink_off_duration =
+		readl_relaxed(mvebu_pwmreg_blink_off_duration(&mvpwm->controller));
 }
 
 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
@@ -758,10 +822,10 @@ static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
 
 	regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
 		     mvpwm->blink_select);
-	writel_relaxed(mvpwm->blink_on_duration,
-		       mvebu_pwmreg_blink_on_duration(mvpwm));
-	writel_relaxed(mvpwm->blink_off_duration,
-		       mvebu_pwmreg_blink_off_duration(mvpwm));
+	writel_relaxed(mvpwm->controller.blink_on_duration,
+		       mvebu_pwmreg_blink_on_duration(&mvpwm->controller));
+	writel_relaxed(mvpwm->controller.blink_off_duration,
+		       mvebu_pwmreg_blink_off_duration(&mvpwm->controller));
 }
 
 static int mvebu_pwm_probe(struct platform_device *pdev,
@@ -772,6 +836,7 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	struct mvebu_pwm *mvpwm;
 	struct resource *res;
 	u32 set;
+	enum mvebu_pwm_ctrl ctrl_set;
 
 	if (!of_device_is_compatible(mvchip->chip.of_node,
 				     "marvell,armada-370-gpio"))
@@ -794,12 +859,15 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	 * Use set A for lines of GPIO chip with id 0, B for GPIO chip
 	 * with id 1. Don't allow further GPIO chips to be used for PWM.
 	 */
-	if (id == 0)
+	if (id == 0) {
 		set = 0;
-	else if (id == 1)
+		ctrl_set = MVEBU_PWM_CTRL_SET_A;
+	} else if (id == 1) {
 		set = U32_MAX;
-	else
+		ctrl_set = MVEBU_PWM_CTRL_SET_B;
+	} else {
 		return -EINVAL;
+	}
 	regmap_write(mvchip->regs,
 		     GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set);
 
@@ -809,15 +877,13 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	mvchip->mvpwm = mvpwm;
 	mvpwm->mvchip = mvchip;
 
-	mvpwm->membase = devm_ioremap_resource(dev, res);
-	if (IS_ERR(mvpwm->membase))
-		return PTR_ERR(mvpwm->membase);
+	mvpwm->controller.membase = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mvpwm->controller.membase))
+		return PTR_ERR(mvpwm->controller.membase);
 
-	mvpwm->clk_rate = clk_get_rate(mvchip->clk);
-	if (!mvpwm->clk_rate) {
-		dev_err(dev, "failed to get clock rate\n");
+	mvpwm->controller.clk_rate = clk_get_rate(mvchip->clk);
+	if (!mvpwm->controller.clk_rate)
 		return -EINVAL;
-	}
 
 	mvpwm->chip.dev = dev;
 	mvpwm->chip.ops = &mvebu_pwm_ops;
@@ -830,7 +896,9 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	 */
 	mvpwm->chip.base = -1;
 
-	spin_lock_init(&mvpwm->lock);
+	spin_lock_init(&mvpwm->controller.lock);
+	mvpwm->default_counter = ctrl_set;
+	mvebu_pwm_list[ctrl_set] = &mvpwm->controller;
 
 	return pwmchip_add(&mvpwm->chip);
 }