linux-kernel - Re: [PATCH v2 12/26] drm/sun4i: Add support for multiple DW HDMI PHY clock parents

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Message-ID: <1589389.XrQdaPTFv2@jernej-laptop>
Date:   Sat, 19 May 2018 09:11:15 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 12/26] drm/sun4i: Add support for multiple DW HDMI PHY clock parents

Hi,

Dne petek, 18. maj 2018 ob 17:26:51 CEST je Maxime Ripard napisal(a):
> On Fri, May 18, 2018 at 04:46:41PM +0200, Jernej Škrabec wrote:
> > > And this is a bit sloppy, since if phy_clk_num == 3, you won't try to
> > > lookup pll-2 either.
> > 
> > It is highly unlikely this will be higher than 2, at least for this HDMI
> > PHY, since it has only 1 bit reserved for parent selection. But since I
> > have to fix it, I'll add ">= 2"
> 
> If we're only going to have two parents at most, ever, why don't we
> had just a single other boolean. This would be less intrusive, and we
> wouldn't have to check for those corner cases.

It seems that usage of "bool" data type in structures is not wanted anymore 
according to checkpatch and this: https://lkml.org/lkml/2017/11/21/384

I guess I'll use "unsigned int" as recommended by Linus and named it 
"has_second_parent" to be unambigous that it's boolean in reality.

Best regards,
Jernej

> 
> > BTW, I'll resend fixed version of this patch for my R40 HDMI series, since
> > there is nothing to hold it back, unlike for this.
> 
> Awesome, thanks!
> Maxime
> 
> --
> Maxime Ripard, Bootlin (formerly Free Electrons)
> Embedded Linux and Kernel engineering
> https://bootlin.com