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

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Date: Tue, 20 Feb 2024 09:22:25 +0800
From: Chen Wang <unicorn_wang@...look.com>
To: Guo Ren <guoren@...nel.org>, 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
Subject: Re: [PATCH v10 5/5] riscv: dts: add clock generator for Sophgo SG2042
 SoC


On 2024/2/20 9:18, Guo Ren wrote:
> 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?
Yes, according to TRM, there are three input cgi(Clock Generator IC) on 
board.
>
>>   &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>
>