diff mbox series

[7/8] pwm: dwc: add snps,pwm-number to limit pwm count

Message ID 20220805165033.140958-8-ben.dooks@sifive.com
State Changes Requested
Headers show
Series [1/8] dt-bindings: pwm: Document Synopsys DesignWare snps,pwm-dw-apb-timers-pwm2 | expand

Commit Message

Ben Dooks Aug. 5, 2022, 4:50 p.m. UTC 
Add snps,pwm-number property to indicate if the block does not have
all 8 of the PWM blocks.

Not sure if this should be a general PWM property consider optional
for all PWM types, so have added a specific one here (there is only
one other controller with a property for PWM count at the moment)

Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
---
 drivers/pwm/pwm-dwc.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
index 5c319d0e3d52..5edfb8f8acbf 100644
--- a/drivers/pwm/pwm-dwc.c
+++ b/drivers/pwm/pwm-dwc.c
@@ -328,12 +328,20 @@  static int dwc_pwm_plat_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct dwc_pwm *dwc;
+	u32 nr_pwm;
 	int ret;
 
 	dwc = dwc_pwm_alloc(dev);
 	if (!dwc)
 		return -ENOMEM;
 
+	if (!device_property_read_u32(dev, "snps,pwm-number", &nr_pwm)) {
+		if (nr_pwm > DWC_TIMERS_TOTAL)
+			dev_err(dev, "too many PWMs specified (%d)\n", nr_pwm);
+		else
+			dwc->chip.npwm = nr_pwm;
+	}
+
 	dwc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dwc->base))
 		return dev_err_probe(dev, PTR_ERR(dwc->base),