linux-kernel - Re: [PATCH v2 5/8] soc: sifive: ccache: Add StarFive JH7110 support

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Message-ID: <b4afb821-f899-a2b6-46e1-a31b5e3f974e@starfivetech.com>
Date:   Tue, 22 Nov 2022 17:02:50 +0800
From:   Hal Feng <hal.feng@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>
CC:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Ben Dooks <ben.dooks@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/8] soc: sifive: ccache: Add StarFive JH7110 support

On Fri, 18 Nov 2022 19:45:57 +0800, Conor Dooley wrote:
> Hey Emil/Hal,
> 
> On Fri, Nov 18, 2022 at 09:17:11AM +0800, Hal Feng wrote:
> > From: Emil Renner Berthing <kernel@...il.dk>
> > 
> > This adds support for the StarFive JH7110 SoC which also
> > features this SiFive cache controller.
> > 
> > Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
> > Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
> > ---
> >  arch/riscv/Kconfig.socs            | 1 +
> >  drivers/soc/Makefile               | 2 +-
> >  drivers/soc/sifive/Kconfig         | 2 +-
> >  drivers/soc/sifive/sifive_ccache.c | 1 +
> >  4 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> > index 69774bb362d6..5a40e05f8cab 100644
> > --- a/arch/riscv/Kconfig.socs
> > +++ b/arch/riscv/Kconfig.socs
> > @@ -22,6 +22,7 @@ config SOC_STARFIVE
> >  	bool "StarFive SoCs"
> >  	select PINCTRL
> >  	select RESET_CONTROLLER
> > +	select SIFIVE_CCACHE
> 
> Please no. I am trying to get rid of these selects + I cannot figure out
> why this driver is so important that you *need* to select it. Surely the
> SoC is useable without it> 
> Is this a hang over from your vendor tree that uses the driver to do
> non-coherent stuff for the jh7100?

I have tested that the board can successfully boot up without the cache
driver. The `select` can be removed for JH7110. @Emil, what do you think
of this?

> 
> >  	select SIFIVE_PLIC
> >  	help
> >  	  This enables support for StarFive SoC platform hardware.
> > diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
> > index 69ba6508cf2c..534669840858 100644
> > --- a/drivers/soc/Makefile
> > +++ b/drivers/soc/Makefile
> > @@ -26,7 +26,7 @@ obj-y				+= qcom/
> >  obj-y				+= renesas/
> >  obj-y				+= rockchip/
> >  obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
> > -obj-$(CONFIG_SOC_SIFIVE)	+= sifive/
> > +obj-y				+= sifive/
> 
> This bit is fine.
> 
> >  obj-y				+= sunxi/
> >  obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
> >  obj-y				+= ti/
> > diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig
> > index ed4c571f8771..e86870be34c9 100644
> > --- a/drivers/soc/sifive/Kconfig
> > +++ b/drivers/soc/sifive/Kconfig
> > @@ -1,6 +1,6 @@
> >  # SPDX-License-Identifier: GPL-2.0
> >  
> > -if SOC_SIFIVE
> > +if SOC_SIFIVE || SOC_STARFIVE
> 
> As I suppose is this - but hardly scalable. I suppose it doesn't really
> matter.
> 
> >  config SIFIVE_CCACHE
> >  	bool "Sifive Composable Cache controller"
> > diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/soc/sifive/sifive_ccache.c
> > index 1c171150e878..9489d1a90fbc 100644
> > --- a/drivers/soc/sifive/sifive_ccache.c
> > +++ b/drivers/soc/sifive/sifive_ccache.c
> > @@ -107,6 +107,7 @@ static const struct of_device_id sifive_ccache_ids[] = {
> >  	{ .compatible = "sifive,fu540-c000-ccache" },
> >  	{ .compatible = "sifive,fu740-c000-ccache" },
> >  	{ .compatible = "sifive,ccache0" },
> > +	{ .compatible = "starfive,jh7110-ccache" },
> 
> Per my second reply to the previous patch, I am not sure why you do not
> just have a fallback compatible in the binding/dt for the fu740 ccache
> since you appear to have identical configuration?

Yeah, I will use the compatible of fu740 and modify this patch.

Best regards,
Hal