linux-kernel - Re: [PATCH v2] arm: sun4i: Add support for Pengpod 1000 tablet

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Date:   Tue, 5 Jun 2018 16:50:38 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Bob Ham <rah@...trans.net>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm: sun4i: Add support for Pengpod 1000 tablet

On Mon, Jun 04, 2018 at 06:33:02PM +0100, Bob Ham wrote:
> On 04/06/18 09:13, Maxime Ripard wrote:
> > On Sat, Jun 02, 2018 at 05:03:13PM +0100, Bob Ham wrote:
> 
> >> + * This file is dual-licensed: you can use it either under the terms
> >> + * of the GPL or the X11 license, at your option. Note that this dual
> >> + * licensing only applies to this file, and not this project as a
> >> + * whole.
> 
> >> + *     The above copyright notice and this permission notice shall be
> >> + *     included in all copies or substantial portions of the Software.
> 
> > And this is redundant with the SPDX header.
> 
> The X11 license notice states explicitly that the notice has to be
> included in the file.  Wouldn't removing it be a violation of the license?

The SPDX header is explicitly here to remove the license text and
create a tag that is in a indirect reference to the license text in
LICENSES. It's not going away.

> >> +		brightness-levels = <0 10 20 30 40 50 60 70 80 90 100>;
> > 
> > Each step should increase the perceived brightness by roughly 1/Nth, N
> > being the number of steps. Usually PWM backlights don't work like that.
> 
> FYI, this was copied from another .dts file.  All of the other
> brightness-levels settings in sun{4,5,7}i .dts files follow similar
> patterns:
> 
> sun4i-a10-dserve-dsrv9703c.dts:               brightness-levels = <0 10
> 20 30 40 50 60 70 80 90 100>;
> sun4i-a10-inet1.dts:          brightness-levels = <0 10 20 30 40 50 60
> 70 80 90 100>;
> sun4i-a10-pov-protab2-ips9.dts:               brightness-levels = <0 10
> 20 30 40 50 60 70 80 90 100>;
> sun5i-a13-empire-electronix-d709.dts:         brightness-levels = <0 10
> 20 30 40 50 60 70 80 90 100>;
> sun5i-a13-utoo-p66.dts:       brightness-levels = <0 30 40 50 60 70 80
> 90 100>;
> sun5i-gr8-evb.dts:            brightness-levels = <0 10 20 30 40 50 60
> 70 80 90 100>;
> sun7i-a20-wexler-tab7200.dts:         brightness-levels = <0 10 20 30 40
> 50 60 70 80 90 100>;

I never said we were perfect reviewers. Feel free to help in the process.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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