linux-kernel - Re: [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states

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Message-ID: <51E70ADF.8090805@wwwdotorg.org>
Date:	Wed, 17 Jul 2013 15:21:35 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tony Lindgren <tony@...mide.com>
CC:	linus.walleij@...aro.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states

On 07/16/2013 03:05 AM, Tony Lindgren wrote:
> We want to have static pin states handled separately from
> dynamic pin states, so let's add optional state_active.
> 
> Then if state_active is defined, let's check and make sure
> state_idle and state_sleep match state_active for the
> pin groups to avoid checking them during runtime as the
> active and idle pins may need to be toggled for many
> devices every time we enter and exit idle.

> +	 * Note that if active state is defined, sleep and idle states must
> +	 * cover the same pin groups as active state.
>  	 */
>  	dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
>  					PINCTRL_STATE_SLEEP);
> -	if (IS_ERR(dev->pins->sleep_state))
> +	if (IS_ERR(dev->pins->sleep_state)) {
>  		/* Not supplying this state is perfectly legal */
>  		dev_dbg(dev, "no sleep pinctrl state\n");
> +	} else if (!IS_ERR(dev->pins->active_state)) {
> +		ret = pinctrl_check_dynamic(dev, dev->pins->active_state,
> +					    dev->pins->sleep_state);

Oh, I see you're trying to check that the set of pins in the active,
sleep, and idle states are identical.

But I think that pinctrl_check_dynamic() only checks that one state is a
subset of the other, not that the two states are equal. Instead, I think
you want to comparison coded in pinctrl_check_dynamic() to be:

gen_group_list_of_pinctrl_state(s1, array1);
gen_group_list_of_pinctrl_state(s2, array2);
mismatch = memcmp(array1, array2, length);
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