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Message-ID: <186273b85d1.e6e326dd2609909.4901324458297607618@linux.beauty>
Date: Mon, 06 Feb 2023 22:57:37 +0800
From: Li Chen <me@...ux.beauty>
To: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
Cc: "li chen" <lchen@...arella.com>,
"michael turquette" <mturquette@...libre.com>,
"stephen boyd" <sboyd@...nel.org>,
"rob herring" <robh+dt@...nel.org>,
"krzysztof kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
"moderated list:arm/ambarella soc support"
<linux-arm-kernel@...ts.infradead.org>,
"open list:common clk framework" <linux-clk@...r.kernel.org>,
"open list:open firmware and flattened device tree bindings"
<devicetree@...r.kernel.org>,
"open list" <linux-kernel@...r.kernel.org>,
"arnd bergmann" <arnd@...db.de>
Subject: Re: [PATCH 07/15] dt-bindings: clock: Add Ambarella clock bindings
Hi Krzysztof,
---- On Mon, 06 Feb 2023 21:41:44 +0800 Krzysztof Kozlowski wrote ---
> On 06/02/2023 12:28, Li Chen wrote:
> > Hi Krzysztof ,
> >
> > ---- On Fri, 27 Jan 2023 23:08:09 +0800 Krzysztof Kozlowski wrote ---
> > > On 27/01/2023 15:48, Li Chen wrote:
> > > > >
> > > > > but what you are saying is that there is no separate clock controller
> > > > > device with its own IO address but these clocks are part of rct_syscon.
> > > > > Then model it that way in DTS. The rct_syscon is then your clock
> > > > > controller and all these fake gclk-core and gclk-ddr nodes should be gone.
> > > >
> > > > Ok, I will remove these fake nodes, and model the hardware as:
> > > >
> > > > rct_syscon node
> > > > | clock node(pll, div, mux, composite clocks live in the same driver)
> > > > | other periphal nodes
> > >
> > > You need clock node if it takes any resources. If it doesn't, you do not
> > > need it.
> >
> > If the only hardware resource the clock node can take is its parent clock(clocks = &osc;),
> > then can I have this clock node?
>
> I am not sure if I understand. osc does not look like parent device, so
> this part of comment confuses me.
Sorry for the confusion. I mean osc is the root of clock tree:
osc
| pll A
| pll B
| ...
So if I have a clock node under rct_syscon node, I think it should take osc as the parent(node) clock:
rct_syscon {
......
clock_controller {
clocks = <&osc>;
......
You have said "You need clock node if it takes any resources. ", do you think osc here can be counted as a used resource?
Regards,
Li
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