linux-kernel - Re: [RESEND PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.

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Date:   Mon, 19 Feb 2018 10:56:04 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [RESEND PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.

Hi Lee,

Am Montag, 19. Februar 2018, 10:22:47 CET schrieb Lee Jones:
> On Fri, 16 Feb 2018, Enric Balletbo i Serra wrote:
> 
> > Hardware needs a delay between setting an initial (non-zero) PWM and
> > enabling the backlight using GPIO. The post-pwm-on-delay-ms specifies
> > this delay in milli seconds. Hardware also needs a delay between disabing
> > the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-ms
> > is this delay in milli seconds.
> > 
> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> > Acked-by: Pavel Machek <pavel@....cz>
> > ---
> > Based on the original Huang Lin <hl@...k-chips.com> work.
> > 
> > Changes since v4:
> >  - Rebase on top of mainline.
> > Changes since v3:
> >  - Replace us for ms.
> >  - Add Acked-by: Pavel Machek <pavel@....cz>
> > Changes since v2:
> >  - Use separate properties (Rob Herring)
> > Changes since v1:
> >  - As suggested by Daniel Thompson
> >    - Do not assume power-on delay and power-off delay will be the same
> > 
> >  Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++
> >  1 file changed, 6 insertions(+)
> 
> Looks like this still needs an Ack.
> 
> Also, you didn't supply a 0th (cover-letter) patch, so I have no idea
> of patch history or your future intentions.
> 
> Are there build-time dependencies between them or can each patch be
> merged via their respective trees without the fear of merge/build
> failure?

When looking at the patches, there do not seem to be any build-time
dependencies between the patch 1-3 (backlight) and 4+5 devicetree,
so after Rob hopefully has time to look at the binding change, I'd suspect
you take the code changes and I'll take the dts changes.


Heiko