Re: [PATCH RESEND 7/7] riscv: dts: spacemit: add reset support for the K1 SoC

Yixun Lan
2025-03-24T06:07:01Z

Hi Alex:

On 08:23 Sun 23 Mar , Alex Elder wrote:
> On 3/22/25 11:48 AM, Yixun Lan wrote:
> > On 10:18 Fri 21 Mar , Alex Elder wrote:
> >> Define syscon nodes for the RCPU, RCPU2, and APBC2 SpacemiT CCUS, which
> >> currently support resets but not clocks in the SpacemiT K1.
> >>
> >> Signed-off-by: Alex Elder <elder@riscstar.com>
> >> ---
> >> arch/riscv/boot/dts/spacemit/k1.dtsi | 18 ++++++++++++++++++
> >> 1 file changed, 18 insertions(+)
> >>
> >> diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
> >> index 09a9100986b19..f86d1b58c6d35 100644
> >> --- a/arch/riscv/boot/dts/spacemit/k1.dtsi
> >> +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
> >> @@ -350,6 +350,18 @@ soc {
> >> dma-noncoherent;
> >> ranges;
> >>
> >> + syscon_rcpu: system-controller@c0880000 {
> > I'm not sure if syscon_rcpu is good name to go, it's AUDIO Peripherals
> > in docs, see
> >
> > 7.2 Main CPU Domain Address Mapping
> > https://developer.spacemit.com/documentation?token=LzJyw97BCipK1dkUygrcbT0NnMg
>
> They call it "AUD_MCUSYSCTRL section <RCPU(0xC0880000)>",
> where the registers layouts are defined, and the register
> names use the "RCPU" prefix by convention.
>
> I guess I could use "AUDIO" instead, but I think it's
> "RCPU" is a little better because of the way things in
> the region are named. It's a little like how "pll" is
> used for the DT node name for things in the "APBS" region.
> I don't really like that, because the connection between
> the two isn't very clear.
>
ok, by whatever you choose, I'd be fine
in case you go with RCPU, can you put a comment above? explain
there is slightly a devergence with docs from SpacemiT's web

also I noticed the io size you written here is smaller than described in
docs which I think usually it's fine (docs may give larger number - 0x80000)
just make sure you checked? so all real io region will be covered, same
for rcpu2

> >> + compatible = "spacemit,k1-syscon-rcpu";
> >> + reg = <0x0 0xc0880000 0x0 0x2048>;
> >> + #reset-cells = <1>;
> >> + };
> >> +
> >> + syscon_rcpu2: system-controller@c0888000 {
> > not found this address mapping in above docs link
>
> You're right. I was following what the downstream code did.
> I'll gladly just include this in the main "RCPU" node.
>
> Thank you very much for the review Yixun.
>
> -Alex
>
> >> + compatible = "spacemit,k1-syscon-rcpu2";
> >> + reg = <0x0 0xc0888000 0x0 0x28>;
> >> + #reset-cells = <1>;
> >> + };
> >> +
> >> syscon_apbc: system-control@d4015000 {
> >> compatible = "spacemit,k1-syscon-apbc";
> >> reg = <0x0 0xd4015000 0x0 0x1000>;
> >> @@ -518,6 +530,12 @@ clint: timer@e4000000 {
> >> <&cpu7_intc 3>, <&cpu7_intc 7>;
> >> };
> >>
> >> + syscon_apbc2: system-controller@f0610000 {
> >> + compatible = "spacemit,k1-syscon-apbc2";
> >> + reg = <0x0 0xf0610000 0x0 0x20>;
> >> + #reset-cells = <1>;
> >> + };
> >> +
> >> sec_uart1: serial@f0612000 {
> >> compatible = "spacemit,k1-uart", "intel,xscale-uart";
> >> reg = <0x0 0xf0612000 0x0 0x100>;
> >> --
> >> 2.43.0
> >>
> >
>
>

--
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55