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Subject: Re: [PATCH 2/2] clk: meson-g12a: Add AO Clock controller driver
From: Jerome Brunet <jbrunet@baylibre.com>
To: Jian Hu <jian.hu@amlogic.com>, Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>, Carlo Caione <carlo@caione.org>,
 Rob Herring <robh@kernel.org>, Martin Blumenstingl
 <martin.blumenstingl@googlemail.com>, Michael Turquette
 <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, Yixun Lan
 <yixun.lan@amlogic.com>,  Jianxin Pan <jianxin.pan@amlogic.com>,
 linux-clk@vger.kernel.org, linux-amlogic@lists.infradead.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 devicetree@vger.kernel.org
Date: Fri, 14 Sep 2018 10:33:35 +0200
In-Reply-To: <977d8010-6d82-5eac-5da5-6dbe0f73971a@amlogic.com>
References: <1533894868-85815-1-git-send-email-jian.hu@amlogic.com>
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	 <6c855dc62fe6ed1a01216bd708d401a280f8762c.camel@baylibre.com>
	 <fff1f982-c9f3-8aa4-b108-6c0998827e79@amlogic.com>
	 <89b058a7bba26058fab95dea01155221dbb642ce.camel@baylibre.com>
	 <977d8010-6d82-5eac-5da5-6dbe0f73971a@amlogic.com>
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On Tue, 2018-08-28 at 11:35 +0800, Jian Hu wrote:
> Hi: Jerome
> 
> On 2018/8/27 21:07, Jerome Brunet wrote:
> > On Fri, 2018-08-24 at 21:34 +0800, Jian Hu wrote:
> > > > 
> > > 
> > > I am confued about aoclk81's parent clocks.
> > > 
> > > I can not get the example of axg audio clock driver, Could you provide
> > > the link? Had it merged into clk-meson.git?
> > 
> > Yes and mainline as well : drivers/clk/meson/axg-audio.c
> > 
> > Basically this driver is creating bypass input clocks (audio_pclk, mst_in[0-9],
> > etc...) .
> > 
> > This allows to collect input clocks from DT (like any consumer should) will
> > keeping constant in the controller clock tree.
> > 
> > > From what I've seen of your controller drivers, the EE controller should have
> > 
> > one input, the AO should have 3.
> > 
> > 
> > 
> > .
> > 
> 
> I still can not get the example meaning in axg audio driver.

here is one specific example:


https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/clk/meson/axg-audio.c?h=v4.19-rc1#n785


> 
> In 26 page of A113D_Datasheet V0.7 20170725-Baylibre.pdf,We can see the 
> aoclk81 has two parents. clk81 and ao_slow_clk. I can not get 3 parents.
> 
>                           clk81|\
>                         -------| \        aoclk81
> src0 |\                       |  |-------------------
> -----| \     ao_slow_clk      |  |
>       |  |---------------------| /
> -----| /                      |/
>   src1|/
> 
> 
> src0 is from xtal, if can generate 32k clock, but it is never used.
> src1 is from gpio clock, It is never used. If necessary， the ao_slow_clk 
> maybe described.
> 
> So why aoclk81 has 3 parents?

I never said that. I said your clock controller driver should have 3 input
clocks. These clock are the one used by the controller but not produced by it:
for the AO controller xtal, ao_xtal, and ee controller clk81.