linux-kernel - Re: [PATCH 04/14] clk: sunxi: add ahb1 clock for A83T

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Message-ID: <20160204080109.GA4270@lukather>
Date:	Thu, 4 Feb 2016 09:01:09 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Vishnu Patekar <vishnupatekar0510@...il.com>
Cc:	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Jens Kuske <jenskuske@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Chen-Yu Tsai <wens@...e.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
	linux-gpio@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Reinder de Haan <patchesrdh@...as.com>,
	linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 04/14] clk: sunxi: add ahb1 clock for A83T

On Thu, Feb 04, 2016 at 02:06:45PM +0800, Vishnu Patekar wrote:
> Hello Maxime,
> 
> 
> On Tue, Feb 2, 2016 at 9:17 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi,
> >
> > On Sun, Jan 31, 2016 at 09:20:56AM +0800, Vishnu Patekar wrote:
> >> AHB1 on A83T is similar to ahb1 on A31, except parents are different.
> >> clock index 0b1x is PLL6.
> >>
> >> Signed-off-by: Vishnu Patekar <vishnupatekar0510@...il.com>
> >
> > If the clock is the same but the parents are different, then we don't
> > need to duplicate all the logic. Simply add the number of parents to
> > mux_data, and you're all set.
> 
> Problem here is: parent 0b10 for A31 ahb1 is AXI, 0b11 is pll6/pre_div.
> 0b10 and 0b11 is pll6/pre_div.
> So, just adding number of parents to mux_data will not solve problem.

Is anyone using 0b11 ? Can't we just ignore it?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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