linux-kernel - Re: [PATCH v4 4/4] arm64: dts: broadcom: Add support for BCM2712

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Date: Thu, 30 May 2024 11:24:00 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Stefan Wahren <wahrenst@....net>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kamal Dasu <kamal.dasu@...adcom.com>,
	Al Cooper <alcooperx@...il.com>, devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH v4 4/4] arm64: dts: broadcom: Add support for BCM2712

Hi Stefan,

On 08:11 Thu 30 May     , Stefan Wahren wrote:
[cut...] 
> > +	clocks {
> > +		/* The oscillator is the root of the clock tree. */
> > +		clk_osc: clk-osc {
> > +			compatible = "fixed-clock";
> > +			#clock-cells = <0>;
> > +			clock-output-names = "osc";
> > +			clock-frequency = <54000000>;
> > +		};
> > +
> > +		clk_vpu: clk-vpu {
> > +			#clock-cells = <0>;
> > +			compatible = "fixed-clock";
> > +			clock-frequency = <750000000>;
> > +			clock-output-names = "vpu-clock";
> > +		};
> Is the VPU clock really fixed or is it just a workaround for minimal
> boot support?

Unfortunately I don't have enough insight on this due to lack of documentation.
I had to take it by faith from downstream dts.

Many thanks,
Andrea