Re: [RESEND PATCH v2 2/5] backlight: pwm_bl: Add device link for pwm_bl and pwm

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Hi Brian,

On 10/17/2017 07:57 AM, Brian Norris wrote:
This is going to be a*lot*  of churn throughout the tree, if we expect
all resource consumers to do this. I think we'd want some kind of
agreement from the PM maintainers and (larger) subsystem owners before
going down this route...

And in the PWM case, pwm_get() already has the device pointer. Why can't
we just instrument it instead?

according to pwm_bl driver, we may need to take care of pwm_request() too:

        pb->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) { dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
                pb->legacy = true;
                pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
        }

and maybe also *of_pwm_get...

maybe we can add a dummy pwm chip for those orphan pwms?

Brian


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