Merge tag 'pwm/for-4.19-rc1' of...

Required properties:

- compatible: Should be "fsl,vf610-ftm-pwm".

- compatible : should be "fsl,<soc>-ftm-pwm" and one of the following

   compatible strings:

  - "fsl,vf610-ftm-pwm" for PWM compatible with the one integrated on VF610

  - "fsl,imx8qm-ftm-pwm" for PWM compatible with the one integrated on i.MX8QM

- reg: Physical base address and length of the controller's registers

- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of

  the cells format.

   - "mediatek,mt2712-pwm": found on mt2712 SoC.

   - "mediatek,mt7622-pwm": found on mt7622 SoC.

   - "mediatek,mt7623-pwm": found on mt7623 SoC.

   - "mediatek,mt7628-pwm": found on mt7628 SoC.

 - reg: physical base address and length of the controller's registers.

 - #pwm-cells: must be 2. See pwm.txt in this directory for a description of

   the cell format.

 - clocks: phandle and clock specifier of the PWM reference clock.

 - clock-names: must contain the following:

 - clock-names: must contain the following, except for MT7628 which

                has no clocks

   - "top": the top clock generator

   - "main": clock used by the PWM core

   - "pwm1-8": the eight per PWM clocks for mt2712

 - "renesas,pwm-r8a7795": for R-Car H3

 - "renesas,pwm-r8a7796": for R-Car M3-W

 - "renesas,pwm-r8a77965": for R-Car M3-N

 - "renesas,pwm-r8a77990": for R-Car E3

 - "renesas,pwm-r8a77995": for R-Car D3

- reg: base address and length of the registers block for the PWM.

- #pwm-cells: should be 2. See pwm.txt in this directory for a description of

config PWM_MEDIATEK

	tristate "MediaTek PWM support"

	depends on ARCH_MEDIATEK || COMPILE_TEST

	depends on ARCH_MEDIATEK || RALINK || COMPILE_TEST

	help

	  Generic PWM framework driver for Mediatek ARM SoC.

#define BERLIN_PWM_EN			0x0

#define  BERLIN_PWM_ENABLE		BIT(0)

#define BERLIN_PWM_CONTROL		0x4

#define  BERLIN_PWM_PRESCALE_MASK	0x7

#define  BERLIN_PWM_PRESCALE_MAX	4096

/*

 * The prescaler claims to support 8 different moduli, configured using the

 * low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,

 * 256, 1024, and 4096.)  However, the moduli from 4 to 1024 appear to be

 * implemented by internally shifting TCNT left without adding additional

 * bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;

 * for 8, 0x1fff; and so on. This means that those moduli are entirely

 * useless, as we could just do the shift ourselves. The 4096 modulus is

 * implemented with a real prescaler, so we do use that, but we treat it

 * as a flag instead of pretending the modulus is actually configurable.

 */

#define  BERLIN_PWM_PRESCALE_4096	0x7

#define  BERLIN_PWM_INVERT_POLARITY	BIT(3)

#define BERLIN_PWM_DUTY			0x8

#define BERLIN_PWM_TCNT			0xc

	return container_of(chip, struct berlin_pwm_chip, chip);

}

static const u32 prescaler_table[] = {

	1, 4, 8, 16, 64, 256, 1024, 4096

};

static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *chip,

				   unsigned int channel, unsigned long offset)

{

			     int duty_ns, int period_ns)

{

	struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);

	unsigned int prescale;

	bool prescale_4096 = false;

	u32 value, duty, period;

	u64 cycles, tmp;

	u64 cycles;

	cycles = clk_get_rate(pwm->clk);

	cycles *= period_ns;

	do_div(cycles, NSEC_PER_SEC);

	for (prescale = 0; prescale < ARRAY_SIZE(prescaler_table); prescale++) {

		tmp = cycles;

		do_div(tmp, prescaler_table[prescale]);

	if (cycles > BERLIN_PWM_MAX_TCNT) {

		prescale_4096 = true;

		cycles >>= 12; // Prescaled by 4096

		if (tmp <= BERLIN_PWM_MAX_TCNT)

			break;

	}

	if (tmp > BERLIN_PWM_MAX_TCNT)

		if (cycles > BERLIN_PWM_MAX_TCNT)

			return -ERANGE;

	}

	period = tmp;

	cycles = tmp * duty_ns;

	period = cycles;

	cycles *= duty_ns;

	do_div(cycles, period_ns);

	duty = cycles;

	value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);

	value &= ~BERLIN_PWM_PRESCALE_MASK;

	value |= prescale;

	if (prescale_4096)

		value |= BERLIN_PWM_PRESCALE_4096;

	else

		value &= ~BERLIN_PWM_PRESCALE_4096;

	berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL);

	berlin_pwm_writel(pwm, pwm_dev->hwpwm, duty, BERLIN_PWM_DUTY);