linux-kernel - Re: [PATCH 3/4] arm64: defconfig: Enable Qualcomm IPQ common PLL clock controller

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Message-ID: <379dc513-2eb5-4d33-a09e-e8861dddc502@lunn.ch>
Date: Fri, 9 Aug 2024 15:34:57 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jie Luo <quic_luoj@...cinc.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, quic_kkumarcs@...cinc.com,
	quic_suruchia@...cinc.com, quic_pavir@...cinc.com,
	quic_linchen@...cinc.com, quic_leiwei@...cinc.com
Subject: Re: [PATCH 3/4] arm64: defconfig: Enable Qualcomm IPQ common PLL
 clock controller

On Fri, Aug 09, 2024 at 07:36:35PM +0800, Jie Luo wrote:
> 
> 
> On 8/8/2024 10:41 PM, Krzysztof Kozlowski wrote:
> > On 08/08/2024 16:03, Luo Jie wrote:
> > > The common PLL clock controller provides fixed rate output clocks to
> > > the hardware blocks that enable ethernet function on IPQ platform.
> > 
> > That's defconfig for all platforms, so how anyone can guess which one
> > you target here? Be specific, which company, which Soc, which board
> > needs it.
> > 
> 
> Sure, I will update the commit message as below to provide the details
> required.
> 
> The common PLL hardware block is available in the Qualcomm IPQ SoC such
> as IPQ9574 and IPQ5332. It provides fixed rate output clocks to Ethernet
> related hardware blocks such as external Ethernet PHY or switch. This
> driver is initially being enabled for IPQ9574. All boards based on
> IPQ9574 SoC will require to include this driver in the build.

Does it provide more than Ethernet clocks? I'm just wondering why the
name `common`, when it seems pretty uncommon, specialised for Ethernet
clocks on a couple of SoCs.

   Andrew