Commit 34cbcd72 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Thierry Reding
Browse files

pwm: atmel-tcb: Add sama5d2 support 



Add sama5d2 support. The sama5d2 has a new clock input, its gclk. Index 0
of the clock selector is the gclk instead of the peripheral clock divided
by 2.

For now, the gclk is not used because the peripheral clock divided by 8
already gives a 9.6ns resolution which is enough for most use cases.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 061f8572

drivers/pwm/pwm-atmel-tcb.c

+20 −3
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ struct atmel_tcb_pwm_chip { 
	u8 width;

	struct regmap *regmap;

	struct clk *clk;

	struct clk *gclk;

	struct clk *slow_clk;

	struct atmel_tcb_pwm_device *pwms[NPWM];

	struct atmel_tcb_channel bkup;
@@ -292,7 +293,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, 
	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);

	struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);

	struct atmel_tcb_pwm_device *atcbpwm = NULL;

	int i;

	int i = 0;

	int slowclk = 0;

	unsigned period;

	unsigned duty;
@@ -303,8 +304,11 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, 
	/*

	 * Find best clk divisor:

	 * the smallest divisor which can fulfill the period_ns requirements.

	 * If there is a gclk, the first divisor is actuallly the gclk selector

	 */

	for (i = 0; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) {

	if (tcbpwmc->gclk)

		i = 1;

	for (; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) {

		if (atmel_tcb_divisors[i] == 0) {

			slowclk = i;

			continue;
@@ -383,9 +387,15 @@ static struct atmel_tcb_config tcb_sam9x5_config = { 
	.counter_width = 32,

};



static struct atmel_tcb_config tcb_sama5d2_config = {

	.counter_width = 32,

	.has_gclk = 1,

};



static const struct of_device_id atmel_tcb_of_match[] = {

	{ .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },

	{ .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },

	{ .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },

	{ /* sentinel */ }

};
@@ -396,7 +406,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) 
	const struct atmel_tcb_config *config;

	struct device_node *np = pdev->dev.of_node;

	struct regmap *regmap;

	struct clk *clk;

	struct clk *clk, *gclk = NULL;

	struct clk *slow_clk;

	char clk_name[] = "t0_clk";

	int err;
@@ -428,6 +438,12 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) 
	match = of_match_node(atmel_tcb_of_match, np->parent);

	config = match->data;



	if (config->has_gclk) {

		gclk = of_clk_get_by_name(np->parent, "gclk");

		if (IS_ERR(gclk))

			return PTR_ERR(gclk);

	}



	tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);

	if (tcbpwm == NULL) {

		err = -ENOMEM;
@@ -443,6 +459,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) 
	tcbpwm->channel = channel;

	tcbpwm->regmap = regmap;

	tcbpwm->clk = clk;

	tcbpwm->gclk = gclk;

	tcbpwm->slow_clk = slow_clk;

	tcbpwm->width = config->counter_width;