linux-kernel - Re: [PATCH v7 2/5] pwm: Add Apple PWM controller

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Message-ID: <20230310173735.2v4smudck2qgt27y@pengutronix.de>
Date:   Fri, 10 Mar 2023 18:37:35 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Sasha Finkelstein <fnkl.kernel@...il.com>
Cc:     thierry.reding@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, marcan@...can.st,
        sven@...npeter.dev, alyssa@...enzweig.io, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 2/5] pwm: Add Apple PWM controller

Hello,

On Sat, Jan 14, 2023 at 04:25:05PM +0300, Sasha Finkelstein wrote:
> +static int apple_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> +			   const struct pwm_state *state)
> +{
> +	struct apple_pwm *fpwm;
> +
> +	if (state->polarity == PWM_POLARITY_INVERSED)
> +		return -EINVAL;
> +
> +	fpwm = to_apple_pwm(chip);
> +	if (state->enabled) {
> +		u64 on_cycles, off_cycles;
> +
> +		on_cycles = mul_u64_u64_div_u64(fpwm->clkrate,
> +						state->duty_cycle, NSEC_PER_SEC);
> +		if (on_cycles > 0xFFFFFFFF)
> +			return -ERANGE;

The idea is to configure the biggest duty_cycle that is not bigger than
the requested duty_cycle. So don't return an error here, but use
0xffffffff instead.

I should have catched that in my v4 and my v6 review, sorry, I missed
that.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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