Re: [PATCH v2 3/3] riscv: dts: sophgo: add zfh for sg2042

Conor Dooley
2025-06-06T16:01:47Z

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On Sat, May 31, 2025 at 10:49:58AM +0800, Chen Wang wrote:
>
> On 2025/5/31 9:34, Inochi Amaoto wrote:
> > On Tue, May 27, 2025 at 06:22:05PM +0800, Chen Wang wrote:
> > > On 2025/5/27 17:34, Han Gao wrote:
> > > > On Thu, May 15, 2025 at 9:33 AM Chen Wang <unicorn_wang@outlook.com> wrote:
> > > > > On 2025/5/14 23:15, Han Gao wrote:
> > > > > > sg2042 support Zfh ISA extension [1].
> > > > > >
> > > > > > Link: https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1737721869472/%E7%8E%84%E9%93%81C910%E4%B8%8EC920R1S6%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C%28xrvm%29_20250124.pdf [1]
> > > > > >
> > > > > > Signed-off-by: Han Gao <rabenda.cn@gmail.com>
> > > > > > ---
> > > > > > arch/riscv/boot/dts/sophgo/sg2042-cpus.dtsi | 256 ++++++++++----------
> > > > > > 1 file changed, 128 insertions(+), 128 deletions(-)
> > > > > >
> > > > > > diff --git a/arch/riscv/boot/dts/sophgo/sg2042-cpus.dtsi b/arch/riscv/boot/dts/sophgo/sg2042-cpus.dtsi
> > > > > > index f483f62ab0c4..8dd1a3c60bc4 100644
> > > > > > --- a/arch/riscv/boot/dts/sophgo/sg2042-cpus.dtsi
> > > > > > +++ b/arch/riscv/boot/dts/sophgo/sg2042-cpus.dtsi
> > > > > > @@ -256,11 +256,11 @@ core3 {
> > > > > > cpu0: cpu@0 {
> > > > > > compatible = "thead,c920", "riscv";
> > > > > > device_type = "cpu";
> > > > > > - riscv,isa = "rv64imafdc";
> > > > > > + riscv,isa = "rv64imafdc_zfh";
> > > > > Need not touch this. "riscv,isa" is deprecated and replaced by
> > > > > "riscv,isa-base" & "riscv,isa-extensions".
> > > > >
> > > > > And only adding zfh for this looks a bit werid.
> > > > >
> > > > > Actually, I plan to remove "riscv,isa" later, so please don't touch this
> > > > > from now on.
> > > > I think that since the linux kernel is the upstream for devicetree, it
> > > > cannot yet remove riscv, isa needs to maintain compatibility.
> > > OK, maybe it's not good to remove "riscv,isa".
> > >
> > > Can this patch not modify "riscv,isa", but only add something for
> > > "riscv,isa-extensions"?
> > >
> > I can remove this while merging the patch, is it OK for you?

> Han does not want to remove this "riscv,isa"，he said some other components,
> such as u-boot may have dependency on this.

U-Boot shouldn't, what actually needs it, opensbi?

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