linux-kernel - Re: [PATCH v10 5/5] riscv: dts: add clock generator for Sophgo SG2042 SoC

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Message-ID: <CAJF2gTRPU6-8Wwds=PRREjU3W0cmCpBcc=w7=J9p_y+XSd3o6w@mail.gmail.com>
Date: Tue, 20 Feb 2024 09:18:03 +0800
From: Guo Ren <guoren@...nel.org>
To: Chen Wang <unicornxw@...il.com>
Cc: aou@...s.berkeley.edu, chao.wei@...hgo.com, conor@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, mturquette@...libre.com, 
	palmer@...belt.com, paul.walmsley@...ive.com, richardcochran@...il.com, 
	robh+dt@...nel.org, sboyd@...nel.org, devicetree@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, haijiao.liu@...hgo.com, 
	xiaoguang.xing@...hgo.com, jszhang@...nel.org, inochiama@...look.com, 
	samuel.holland@...ive.com, Chen Wang <unicorn_wang@...look.com>
Subject: Re: [PATCH v10 5/5] riscv: dts: add clock generator for Sophgo SG2042 SoC

On Sun, Feb 18, 2024 at 10:52 AM Chen Wang <unicornxw@...il.com> wrote:
>
> From: Chen Wang <unicorn_wang@...look.com>
>
> Add clock generator node to device tree for SG2042, and enable clock for
> uart.
>
> Signed-off-by: Chen Wang <unicorn_wang@...look.com>
> ---
>  .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  | 12 +++++
>  arch/riscv/boot/dts/sophgo/sg2042.dtsi        | 48 +++++++++++++++++++
>  2 files changed, 60 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> index 49b4b9c2c101..80cb017974d8 100644
> --- a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> +++ b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> @@ -14,6 +14,18 @@ chosen {
>         };
>  };
>
> +&cgi_main {
> +       clock-frequency = <25000000>;
> +};
> +
> +&cgi_dpll0 {
> +       clock-frequency = <25000000>;
> +};
> +
> +&cgi_dpll1 {
> +       clock-frequency = <25000000>;
> +};
> +
If all are fixed, why do we separate them into three pieces? To show
real internal hardware?

>  &uart0 {
>         status = "okay";
>  };
> diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> index ead1cc35d88b..e70c43e2ccbe 100644
> --- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> +++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> @@ -5,6 +5,9 @@
>
>  /dts-v1/;
>  #include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/clock/sophgo,sg2042-pll.h>
> +#include <dt-bindings/clock/sophgo,sg2042-rpgate.h>
> +#include <dt-bindings/clock/sophgo,sg2042-clkgen.h>
>
>  #include "sg2042-cpus.dtsi"
>
> @@ -18,12 +21,54 @@ aliases {
>                 serial0 = &uart0;
>         };
>
> +       cgi_main: oscillator0 {
> +               compatible = "fixed-clock";
> +               clock-output-names = "cgi_main";
> +               #clock-cells = <0>;
> +       };
> +
> +       cgi_dpll0: oscillator1 {
> +               compatible = "fixed-clock";
> +               clock-output-names = "cgi_dpll0";
> +               #clock-cells = <0>;
> +       };
> +
> +       cgi_dpll1: oscillator2 {
> +               compatible = "fixed-clock";
> +               clock-output-names = "cgi_dpll1";
> +               #clock-cells = <0>;
> +       };
> +
>         soc: soc {
>                 compatible = "simple-bus";
>                 #address-cells = <2>;
>                 #size-cells = <2>;
>                 ranges;
>
> +               pllclk: clock-controller@...00100c0 {
> +                       compatible = "sophgo,sg2042-pll";
> +                       reg = <0x70 0x300100c0 0x0 0x40>;
> +                       clocks = <&cgi_main>, <&cgi_dpll0>, <&cgi_dpll1>;
> +                       #clock-cells = <1>;
> +               };
> +
> +               rpgate: clock-controller@...0010368 {
> +                       compatible = "sophgo,sg2042-rpgate";
> +                       reg = <0x70 0x30010368 0x0 0x98>;
> +                       clocks = <&clkgen GATE_CLK_RP_CPU_NORMAL>;
> +                       #clock-cells = <1>;
> +               };
> +
> +               clkgen: clock-controller@...0012000 {
> +                       compatible = "sophgo,sg2042-clkgen";
> +                       reg = <0x70 0x30012000 0x0 0x1000>;
> +                       clocks = <&pllclk MPLL_CLK>,
> +                                <&pllclk FPLL_CLK>,
> +                                <&pllclk DPLL0_CLK>,
> +                                <&pllclk DPLL1_CLK>;
> +                       #clock-cells = <1>;
> +               };
> +
>                 clint_mswi: interrupt-controller@...4000000 {
>                         compatible = "sophgo,sg2042-aclint-mswi", "thead,c900-aclint-mswi";
>                         reg = <0x00000070 0x94000000 0x00000000 0x00004000>;
> @@ -333,6 +378,9 @@ uart0: serial@...0000000 {
>                         interrupt-parent = <&intc>;
>                         interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
>                         clock-frequency = <500000000>;
> +                       clocks = <&clkgen GATE_CLK_UART_500M>,
> +                                <&clkgen GATE_CLK_APB_UART>;
> +                       clock-names = "baudclk", "apb_pclk";
>                         reg-shift = <2>;
>                         reg-io-width = <4>;
>                         status = "disabled";
> --
> 2.25.1
>
Others LGTM.

Reviewed-by: Guo Ren <guoren@...nel.org>

-- 
Best Regards
 Guo Ren