linux-kernel - Re: [PATCH v5 3/5] clk: spacemit: Add clock support for Spacemit K1 SoC

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Message-ID: <Z9_MgAZE53eQ-FV8@ketchup>
Date: Sun, 23 Mar 2025 08:55:28 +0000
From: Haylen Chu <heylenay@....org>
To: Inochi Amaoto <inochiama@...il.com>, Yixun Lan <dlan@...too.org>
Cc: 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>,
	Haylen Chu <heylenay@...look.com>, linux-riscv@...ts.infradead.org,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, spacemit@...ts.linux.dev,
	Inochi Amaoto <inochiama@...look.com>,
	Chen Wang <unicornxdotw@...mail.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>
Subject: Re: [PATCH v5 3/5] clk: spacemit: Add clock support for Spacemit K1
 SoC

On Tue, Mar 18, 2025 at 01:43:52PM +0800, Inochi Amaoto wrote:
> On Tue, Mar 18, 2025 at 05:37:36AM +0000, Yixun Lan wrote:
> > Hi Haylen Chu:
> > 
> > On 17:57 Thu 06 Mar     , Haylen Chu wrote:
> > > The clock tree of K1 SoC contains three main types of clock hardware
> > > (PLL/DDN/MIX) and has control registers split into several multifunction
> > > devices: APBS (PLLs), MPMU, APBC and APMU.
> > > 
> > > All register operations are done through regmap to ensure atomiciy
> > > between concurrent operations of clock driver and reset,
> > > power-domain driver that will be introduced in the future.
> > > 
> > > Signed-off-by: Haylen Chu <heylenay@....org>
> > > ---
> > >  drivers/clk/Kconfig               |    1 +
> > >  drivers/clk/Makefile              |    1 +
> > >  drivers/clk/spacemit/Kconfig      |   20 +
> > >  drivers/clk/spacemit/Makefile     |    5 +
> > >  drivers/clk/spacemit/ccu-k1.c     | 1714 +++++++++++++++++++++++++++++
> > >  drivers/clk/spacemit/ccu_common.h |   47 +
> > >  drivers/clk/spacemit/ccu_ddn.c    |   80 ++
> > >  drivers/clk/spacemit/ccu_ddn.h    |   48 +
> > >  drivers/clk/spacemit/ccu_mix.c    |  284 +++++
> > >  drivers/clk/spacemit/ccu_mix.h    |  246 +++++
> > >  drivers/clk/spacemit/ccu_pll.c    |  146 +++
> > >  drivers/clk/spacemit/ccu_pll.h    |   76 ++
> > >  12 files changed, 2668 insertions(+)
> > >  create mode 100644 drivers/clk/spacemit/Kconfig
> > >  create mode 100644 drivers/clk/spacemit/Makefile
> > >  create mode 100644 drivers/clk/spacemit/ccu-k1.c
> > >  create mode 100644 drivers/clk/spacemit/ccu_common.h
> > >  create mode 100644 drivers/clk/spacemit/ccu_ddn.c
> > >  create mode 100644 drivers/clk/spacemit/ccu_ddn.h
> > >  create mode 100644 drivers/clk/spacemit/ccu_mix.c
> > >  create mode 100644 drivers/clk/spacemit/ccu_mix.h
> > >  create mode 100644 drivers/clk/spacemit/ccu_pll.c
> > >  create mode 100644 drivers/clk/spacemit/ccu_pll.h
> > > 
> > > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> > > index 713573b6c86c..19c1ed280fd7 100644
> > > --- a/drivers/clk/Kconfig
> > > +++ b/drivers/clk/Kconfig
> > > @@ -517,6 +517,7 @@ source "drivers/clk/samsung/Kconfig"
> > >  source "drivers/clk/sifive/Kconfig"
> > >  source "drivers/clk/socfpga/Kconfig"
> > >  source "drivers/clk/sophgo/Kconfig"
> > > +source "drivers/clk/spacemit/Kconfig"
> > >  source "drivers/clk/sprd/Kconfig"
> > >  source "drivers/clk/starfive/Kconfig"
> > >  source "drivers/clk/sunxi/Kconfig"
> > > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> > > index bf4bd45adc3a..42867cd37c33 100644
> > > --- a/drivers/clk/Makefile
> > > +++ b/drivers/clk/Makefile
> > > @@ -145,6 +145,7 @@ obj-$(CONFIG_COMMON_CLK_SAMSUNG)	+= samsung/
> > >  obj-$(CONFIG_CLK_SIFIVE)		+= sifive/
> > >  obj-y					+= socfpga/
> > >  obj-y					+= sophgo/
> > > +obj-y					+= spacemit/
> > >  obj-$(CONFIG_PLAT_SPEAR)		+= spear/
> > >  obj-y					+= sprd/
> > >  obj-$(CONFIG_ARCH_STI)			+= st/
> > > diff --git a/drivers/clk/spacemit/Kconfig b/drivers/clk/spacemit/Kconfig
> > > new file mode 100644
> > > index 000000000000..76090cd85668
> > > --- /dev/null
> > > +++ b/drivers/clk/spacemit/Kconfig
> > > @@ -0,0 +1,20 @@
> > > +# SPDX-License-Identifier: GPL-2.0-only
> > > +

Hi Inochi, Yixun,

> > > +config SPACEMIT_CCU
> > > +	tristate "Clock support for Spacemit SoCs"
> > > +	default y
> > similar reason to pinctrl with these patches [1], [2]
> > I'd suggest switch to "bool + default ARCH_SPACEMIT" 
> > 
> > Link: https://lore.kernel.org/all/20250218-k1-pinctrl-option-v3-1-36e031e0da1b@gentoo.org [1]
> > Link: https://lore.kernel.org/all/6881b8d1ad74ac780af8a974e604b5ef3f5d4aad.1742198691.git.geert+renesas@glider.be [2]
> > 
> 
> Clk subsystem prefers no defalt and set it in defconfig,
> so should no default there.

Thanks for these hints, I will drop default and set the configuration in
defconfig, in which case it seems okay to keep it as bool.

> Regards,
> Inochi

Thanks,
Haylen Chu