linux-kernel - Re: [PATCH 1/4] pwm: bcm-iproc: Remove impossible comparison when validating duty cycle

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Date:   Mon, 29 Jun 2020 09:45:17 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Lee Jones <lee.jones@...aro.org>, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de, linux-pwm@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Yendapally Reddy Dhananjaya Reddy 
        <yendapally.reddy@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 1/4] pwm: bcm-iproc: Remove impossible comparison when
 validating duty cycle



On 6/29/2020 5:47 AM, Lee Jones wrote:
> 'duty' here is an unsigned int, thus checking for <0 will always
> evaluate to false.
> 
> Fixes the following W=1 warning:
> 
>  drivers/pwm/pwm-bcm-iproc.c:147:12: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
> 
> Cc: Ray Jui <rjui@...adcom.com>
> Cc: Scott Branden <sbranden@...adcom.com>
> Cc: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@...adcom.com>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Cc: linux-pwm@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

And IPROC_PWM_DUTY_CYCLE_MIN is unused after remove this single use of
the define, if you also remove it you can add:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian