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

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Date:	Fri, 12 Feb 2016 13:24:39 +0800
From:	Vishnu Patekar <vishnupatekar0510@...il.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.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

Hello Maxime,

On Thu, Feb 4, 2016 at 4:01 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> 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?
Yes, it's used, 0b11 is pll6 parent in case of A31.
>
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com