linux-kernel - Re: [PATCH v7 2/4] dt-bindings: clock: sophgo: support SG2042

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Message-ID: <20240112-overhead-disallow-8c2a4b97c36c@wendy>
Date: Fri, 12 Jan 2024 07:42:14 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Chen Wang <unicorn_wang@...look.com>
CC: Conor Dooley <conor@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>, Chen Wang <unicornxw@...il.com>,
	<aou@...s.berkeley.edu>, <chao.wei@...hgo.com>,
	<krzysztof.kozlowski+dt@...aro.org>, <mturquette@...libre.com>,
	<palmer@...belt.com>, <paul.walmsley@...ive.com>, <richardcochran@...il.com>,
	<robh+dt@...nel.org>, <sboyd@...nel.org>, <devicetree@...r.kernel.org>,
	<linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-riscv@...ts.infradead.org>, <haijiao.liu@...hgo.com>,
	<xiaoguang.xing@...hgo.com>, <guoren@...nel.org>, <jszhang@...nel.org>,
	<inochiama@...look.com>, <samuel.holland@...ive.com>
Subject: Re: [PATCH v7 2/4] dt-bindings: clock: sophgo: support SG2042

On Fri, Jan 12, 2024 at 08:08:15AM +0800, Chen Wang wrote:
> On 2024/1/12 0:58, Conor Dooley wrote:
> > On Thu, Jan 11, 2024 at 04:00:04PM +0800, Chen Wang wrote:

> > > There are four types of clocks for SG2042 and following are where their
> > > control registers are defined in:
> > > 
> > > PLL：all in SYS_CTRL
> > > DIV: all in CLOCK
> > > GATE: some are in SYS_CTRL, some others are in CLOCK
> > When you say "some", do you meant some entire clocks are in SYS_CTRL and
> > some entire clocks are in the CLOCKS? Or do you meant that for a given
> > clock, some registers are in SYS_CTRL and some are in CLOCK? It's the
> > first option, right?
> 
> It's the first option.

Then the gate clocks that are fully contained within SYS_CTRL are
outputs of SYS_CTRL and gate clocks fully contained within CLOCK are
outputs of CLOCK. You should not use a phandle to SYS_CTRL from the
CLOCKS node so that you can pretend they are part of CLOCKS just because
that makes writing your driver easier. That said, obviously you can
share the routines for turning the gates on and off etc.

Cheers,
Conor.

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