linux-kernel - Re: [PATCH v5 05/46] pwm: introduce the pwm

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Message-ID: <20160412113912.GK18882@ulmo.ba.sec>
Date:	Tue, 12 Apr 2016 13:39:12 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	linux-pwm@...r.kernel.org,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
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	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
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	linux-input@...r.kernel.org, Bryan Wu <cooloney@...il.com>,
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	Alexander Shiyan <shc_work@...l.ru>, Milo Kim <milo.kim@...com>
Subject: Re: [PATCH v5 05/46] pwm: introduce the pwm_args concept

On Wed, Mar 30, 2016 at 10:03:28PM +0200, Boris Brezillon wrote:
> Currently the PWM core mixes the current PWM state with the per-platform
> reference config (specified through the PWM lookup table, DT definition or
> directly hardcoded in PWM drivers).
> 
> Create a pwm_args struct to store this reference config, so that PWM users
> can differentiate the current config from the reference one.
> 
> Patch all places where pwm->args should be initialized. We keep the
> pwm_set_polarity/period() calls until all PWM users are patched to
> use pwm_args instead of pwm_get_period/polarity().

Perhaps a helper would be useful? Something like:

	static inline void
	pwm_apply_args(struct pwm_device *pwm, const struct pwm_args *args)
	{
		pwm_set_duty_cycle(pwm, args->duty_cycle);
		pwm_set_period(pwm, args->period);
	}

? That would make it slightly easier to get rid of it again after all
clients have been converted.

With the exception of pwm-clps711x all of these args are set at of_xlate
time (for DT) or from the lookup table in pwm_get() (for non-DT), so it
might even be possible to move this call to the core, so that removal of
it will be a one-liner.

Thierry

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