linux-kernel - Re: [PATCH v8 0/2] PWM support for HiFive Unleashed

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Message-ID: <CAJ2_jOE=8_c6aN2FTQVt0wTpBAkL8BYyF3UFaMmqdvWYWAAmvg@mail.gmail.com>
Date:   Tue, 5 Mar 2019 13:55:41 +0530
From:   Yash Shah <yash.shah@...ive.com>
To:     Andreas Schwab <schwab@...e.de>
Cc:     Palmer Dabbelt <palmer@...ive.com>, linux-pwm@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Thierry Reding <thierry.reding@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sachin Ghadi <sachin.ghadi@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH v8 0/2] PWM support for HiFive Unleashed

On Mon, Mar 4, 2019 at 4:39 PM Andreas Schwab <schwab@...e.de> wrote:
>
> On Mär 01 2019, Yash Shah <yash.shah@...ive.com> wrote:
>
> > This patch series adds a PWM driver and DT documentation
> > for HiFive Unleashed board. The patches are mostly based on
> > Wesley's patch.
>
> That doesn't appear to work with the heartbeat trigger, the led doesn't
> flash.

Make sure you modify the DTS file since with this patch the period is
now passed through the conventional way.
Example:
pwmleds {
    compatible = "pwm-leds";
    heartbeat {
        pwms = <&L45 0 100000 0>;
        max-brightness = <255>;
        linux,default-trigger = "heartbeat";
    };
};

I have tested the heartbeat trigger on HiFive Unleashed board and it's
working with this PWM patch.


>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@...e.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."