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pwm: dwc: make timer clock configurable 

Add a configurable clock base rate for the pwm as when being built
for non-PCI the block may be sourced from an internal clock.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230907161242.67190-3-ben.dooks@codethink.co.uk
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Ben Dooks 2023-09-07 17:12:38 +01:00 committed by Thierry Reding
parent 721ee18848
commit 81432e2e51
2 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pwm/pwm-dwc-core.c
View File

@ -49,13 +49,13 @@ static int __dwc_pwm_configure_timer(struct dwc_pwm *dwc,
* periods and check are the result within HW limits between 1 and
* 2^32 periods.
*/
tmp = DIV_ROUND_CLOSEST_ULL(state->duty_cycle, DWC_CLK_PERIOD_NS);
tmp = DIV_ROUND_CLOSEST_ULL(state->duty_cycle, dwc->clk_ns);
if (tmp < 1 || tmp > (1ULL << 32))
return -ERANGE;
low = tmp - 1;
tmp = DIV_ROUND_CLOSEST_ULL(state->period - state->duty_cycle,
DWC_CLK_PERIOD_NS);
dwc->clk_ns);
if (tmp < 1 || tmp > (1ULL << 32))
return -ERANGE;
high = tmp - 1;
@ -130,12 +130,12 @@ static int dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
duty = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(pwm->hwpwm));
duty += 1;
duty *= DWC_CLK_PERIOD_NS;
duty *= dwc->clk_ns;
state->duty_cycle = duty;
period = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(pwm->hwpwm));
period += 1;
period *= DWC_CLK_PERIOD_NS;
period *= dwc->clk_ns;
period += duty;
state->period = period;
@ -159,6 +159,7 @@ struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
if (!dwc)
return NULL;
dwc->clk_ns = 10;
dwc->chip.dev = dev;
dwc->chip.ops = &dwc_pwm_ops;
dwc->chip.npwm = DWC_TIMERS_TOTAL;

2
drivers/pwm/pwm-dwc.h
View File

@ -24,7 +24,6 @@ MODULE_IMPORT_NS(dwc_pwm);
#define DWC_TIMERS_COMP_VERSION 0xac
#define DWC_TIMERS_TOTAL 8
#define DWC_CLK_PERIOD_NS 10
/* Timer Control Register */
#define DWC_TIM_CTRL_EN BIT(0)
@ -43,6 +42,7 @@ struct dwc_pwm_ctx {
struct dwc_pwm {
struct pwm_chip chip;
void __iomem *base;
unsigned int clk_ns;
struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
};
#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))