linux-kernel - Re: [PATCH v2 3/8] riscv: dts: thead: Add TH1520 pin control nodes

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Date: Tue, 9 Jan 2024 04:02:01 -0800
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Conor Dooley <conor@...nel.org>, 
	Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jisheng Zhang <jszhang@...nel.org>, Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Drew Fustini <dfustini@...libre.com>
Subject: Re: [PATCH v2 3/8] riscv: dts: thead: Add TH1520 pin control nodes

Conor Dooley wrote:
> On Wed, Jan 03, 2024 at 02:28:40PM +0100, Emil Renner Berthing wrote:
> > Add nodes for pin controllers on the T-Head TH1520 RISC-V SoC.
> >
> > Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> > ---
> >  .../boot/dts/thead/th1520-beaglev-ahead.dts   |  4 ++++
> >  .../dts/thead/th1520-lichee-module-4a.dtsi    |  4 ++++
> >  arch/riscv/boot/dts/thead/th1520.dtsi         | 24 +++++++++++++++++++
> >  3 files changed, 32 insertions(+)
> >
> > diff --git a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > index 70e8042c8304..6c56318a8705 100644
> > --- a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > +++ b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > @@ -44,6 +44,10 @@ &osc_32k {
> >  	clock-frequency = <32768>;
> >  };
> >
> > +&aonsys_clk {
> > +	clock-frequency = <73728000>;
> > +};
> > +
> >  &apb_clk {
> >  	clock-frequency = <62500000>;
> >  };
> > diff --git a/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi b/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
> > index a802ab110429..9865925be372 100644
> > --- a/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
> > +++ b/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
> > @@ -25,6 +25,10 @@ &osc_32k {
> >  	clock-frequency = <32768>;
> >  };
> >
> > +&aonsys_clk {
> > +	clock-frequency = <73728000>;
> > +};
> > +
> >  &apb_clk {
> >  	clock-frequency = <62500000>;
> >  };
> > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
> > index ba4d2c673ac8..e65a306ff575 100644
> > --- a/arch/riscv/boot/dts/thead/th1520.dtsi
> > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi
> > @@ -134,6 +134,12 @@ osc_32k: 32k-oscillator {
> >  		#clock-cells = <0>;
> >  	};
> >
> > +	aonsys_clk: aonsys-clk {
> > +		compatible = "fixed-clock";
> > +		clock-output-names = "aonsys_clk";
> > +		#clock-cells = <0>;
> > +	};
>
> Did this stuff sneak into this commit accidentally?

Not really by accident no. It turns out the clock tree has gates for the bus
clock of each pinctrl block and I think it's better to add this clock
dependency to the bindings and driver up front.

Since there is not yet any clock driver the initial device tree for the TH1520
included the dummy apb_clk that two of the pinctrl blocks derive their clock
from, but not the "aonsys" clock needed by the "always-on" pinctrl. I thought
it was better to add this dummy clock with the only (so far) user of it, but if
you have a better idea, let me know.

/Emil