linux-kernel - Re: [PATCH v5 2/2] pwm: sifive: Add a driver for SiFive SoC PWM

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Message-ID: <20190206124442.GG21676@ulmo>
Date:   Wed, 6 Feb 2019 13:44:42 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Yash Shah <yash.shah@...ive.com>
Cc:     palmer@...ive.com, linux-pwm@...r.kernel.org,
        linux-riscv@...ts.infradead.org, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, sachin.ghadi@...ive.com,
        paul.walmsley@...ive.com
Subject: Re: [PATCH v5 2/2] pwm: sifive: Add a driver for SiFive SoC PWM

On Tue, Jan 29, 2019 at 05:13:19PM +0530, Yash Shah wrote:
[...]
> diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
[...]
> +static void pwm_sifive_update_clock(struct pwm_sifive_ddata *pwm,
> +				    unsigned long rate)
> +{
> +	/* (1 << (16+scale)) * 10^9/rate = real_period */
> +	unsigned long scale_pow =
> +			(pwm->approx_period * (u64)rate) / NSEC_PER_SEC;

I think you need another div64_ul() for this one to fix the linker error
that the 0-day builder was pointing out.

Thierry

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