diff mbox series

[v7,07/10] pwm: dwc: make timer clock configurable

Message ID 20221223153820.404565-8-ben.dooks@sifive.com
State New
Headers show
Series Designware PWM driver updates for OF | expand

Commit Message

Ben Dooks Dec. 23, 2022, 3:38 p.m. UTC 
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@sifive.com>
---
v7:
 - remove the "struct clk *" clk field from dwc_pwm_ctx, not used here,
v6:
 - removed DWC_CLK_PERIOD_NS as it is now not needed
v4:
 - moved earlier before the of changes to make the of changes one patch
v2:
  - removed the ifdef and merged the other clock patch in here
---
 drivers/pwm/pwm-dwc.c | 9 +++++----
 drivers/pwm/pwm-dwc.h | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

Comments

Uwe Kleine-König Feb. 16, 2023, 9:33 p.m. UTC | #1 
On Fri, Dec 23, 2022 at 03:38:17PM +0000, Ben Dooks wrote:
> 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@sifive.com>

Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Thanks
Uwe
diff mbox series

Patch

diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
index 90a8ae1252a1..0c6beafa8c41 100644
--- a/drivers/pwm/pwm-dwc.c
+++ b/drivers/pwm/pwm-dwc.c
@@ -47,13 +47,13 @@  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;
@@ -128,12 +128,12 @@  static void 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;
 
@@ -156,6 +156,7 @@  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;
diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
index 68f98eb76152..b29d8cd21208 100644
--- a/drivers/pwm/pwm-dwc.h
+++ b/drivers/pwm/pwm-dwc.h
@@ -22,7 +22,6 @@ 
 #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)
@@ -41,6 +40,7 @@  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))