linux-kernel - Re: [PATCH v2 2/4] reset: sophgo: add SG2042 reset generator driver

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Date: Thu, 25 Jan 2024 14:10:15 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Chen Wang <unicorn_wang@...look.com>, Chen Wang <unicornxw@...il.com>, 
 aou@...s.berkeley.edu, chao.wei@...hgo.com, conor@...nel.org, 
 krzysztof.kozlowski+dt@...aro.org, palmer@...belt.com,
 paul.walmsley@...ive.com,  robh+dt@...nel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org,  linux-riscv@...ts.infradead.org,
 haijiao.liu@...hgo.com,  xiaoguang.xing@...hgo.com, guoren@...nel.org,
 jszhang@...nel.org,  inochiama@...look.com
Subject: Re: [PATCH v2 2/4] reset: sophgo: add SG2042 reset generator driver

On Do, 2024-01-25 at 20:07 +0800, Chen Wang wrote:
> On 2024/1/25 18:43, Philipp Zabel wrote:
> > On Do, 2024-01-25 at 14:11 +0800, Chen Wang wrote:
> > > From: Chen Wang <unicorn_wang@...look.com>
> > > 
> > > Reuse reset-simple driver for the Sophgo SG2042 reset generator.
> > Subject prefix should be "reset: simple: "
> Ok.
> > 
> > > Signed-off-by: Chen Wang <unicorn_wang@...look.com>
> > > ---
> > >   drivers/reset/Kconfig        |  1 +
> > >   drivers/reset/reset-simple.c |  2 ++
> > >   drivers/reset/sophgo/Kconfig | 10 ++++++++++
> > >   3 files changed, 13 insertions(+)
> > >   create mode 100644 drivers/reset/sophgo/Kconfig
> > > 
> > [...]
> > > diff --git a/drivers/reset/sophgo/Kconfig b/drivers/reset/sophgo/Kconfig
> > > new file mode 100644
> > > index 000000000000..9ad96e49e1dd
> > > --- /dev/null
> > > +++ b/drivers/reset/sophgo/Kconfig
> > > @@ -0,0 +1,10 @@
> > > +# SPDX-License-Identifier: GPL-2.0-only
> > > +
> > > +config RESET_SOPHGO_SG2042
> > > +	bool "Sophgo SG2042 Reset Driver"
> > > +	depends on ARCH_SOPHGO || COMPILE_TEST
> > > +	select RESET_SIMPLE
> > > +	default ARCH_SOPHGO
> > > +	help
> > > +	  This enables the reset controller driver for the Sophgo SG2042 SoC.
> > > +
> > Drop the Kconfig, just add a default y if ARCH_SOPHGO to RESET_SIMPLE.
> 
> hi，Philipp,
> 
> The purpose of my adding Kconfig is to consider that other socs under 
> sophgo may not use RESET_SIMPLE. I'm worried that the coverage is too 
> large when default y if ARCH_SOPHGO? What do you think?

If ARCH_SOPHGO coverage is considered too wide, it's not correct to
make RESET_SOPHGO_SG2024 "default ARCH_SOPHGO" either, so there's no
significant difference.

The question is whether you need it at all. Can SG2042 boot, possibly
with reduced functionality, into a useful system without the reset
controller? If so, maybe it is enough to rely on a defconfig to enable
RESET_SIMPLE? Otherwise, reset-simple could be considered small enough
to accept carrying it around for non-SG2042 SoCs by default, it can be
disabled manually, after all.

regards
Philipp