linux-kernel - Re: [PATCH] riscv: dts: sophgo: Add i2c device support for sg2042

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Message-ID:
 <IA1PR20MB4953991A42D25CED2D4A207EBBB72@IA1PR20MB4953.namprd20.prod.outlook.com>
Date: Mon, 29 Jul 2024 10:02:22 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Chen Wang <unicorn_wang@...look.com>, 
	Inochi Amaoto <inochiama@...look.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>, 
	Xiaoguang Xing <xiaoguang.xing@...hgo.com>
Cc: devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: dts: sophgo: Add i2c device support for sg2042

On Mon, Jul 29, 2024 at 09:45:42AM GMT, Chen Wang wrote:
> 
> On 2024/7/26 9:07, Inochi Amaoto wrote:
> > The i2c ip of sg2042 is a standard Synopsys i2c ip, which is already
> > supported by the mainline kernel.
> > 
> > Add i2c device node for sg2042.
> > 
> > Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> > ---
> >   arch/riscv/boot/dts/sophgo/sg2042.dtsi | 54 +++++++++++++++++++++++++-
> >   1 file changed, 53 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> > index 34c802bd3f9b..eebd6817520e 100644
> > --- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> > +++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
> > @@ -44,8 +44,61 @@ soc: soc {
> >   		compatible = "simple-bus";
> >   		#address-cells = <2>;
> >   		#size-cells = <2>;
> > +		interrupt-parent = <&intc>;
> 
> I would suggest this change (use common interrupt-parent for soc) in another
> separated patch and this would looks more clear.
> 
> Then this patch is only for i2c related changes.
> 

Yeah, that is kind of reasonable. I will separate it.

> >   		ranges;
> > 
> > +		i2c0: i2c@...0005000 {
> > +			compatible = "snps,designware-i2c";
> > +			reg = <0x70 0x30005000 0x0 0x1000>;
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			clocks = <&clkgen GATE_CLK_APB_I2C>;
> > +			clock-names = "ref";
> > +			clock-frequency = <100000>;
> > +			interrupts = <101 IRQ_TYPE_LEVEL_HIGH>;
> > +			resets = <&rstgen RST_I2C0>;
> > +			status = "disabled";
> > +		};
> > +
> > +		i2c1: i2c@...0006000 {
> > +			compatible = "snps,designware-i2c";
> > +			reg = <0x70 0x30006000 0x0 0x1000>;
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			clocks = <&clkgen GATE_CLK_APB_I2C>;
> > +			clock-names = "ref";
> > +			clock-frequency = <100000>;
> > +			interrupts = <102 IRQ_TYPE_LEVEL_HIGH>;
> > +			resets = <&rstgen RST_I2C1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		i2c2: i2c@...0007000 {
> > +			compatible = "snps,designware-i2c";
> > +			reg = <0x70 0x30007000 0x0 0x1000>;
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			clocks = <&clkgen GATE_CLK_APB_I2C>;
> > +			clock-names = "ref";
> > +			clock-frequency = <100000>;
> > +			interrupts = <103 IRQ_TYPE_LEVEL_HIGH>;
> > +			resets = <&rstgen RST_I2C2>;
> > +			status = "disabled";
> > +		};
> > +
> > +		i2c3: i2c@...0008000 {
> > +			compatible = "snps,designware-i2c";
> > +			reg = <0x70 0x30008000 0x0 0x1000>;
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			clocks = <&clkgen GATE_CLK_APB_I2C>;
> > +			clock-names = "ref";
> > +			clock-frequency = <100000>;
> > +			interrupts = <104 IRQ_TYPE_LEVEL_HIGH>;
> > +			resets = <&rstgen RST_I2C3>;
> > +			status = "disabled";
> > +		};
> > +
> >   		pllclk: clock-controller@...00100c0 {
> >   			compatible = "sophgo,sg2042-pll";
> >   			reg = <0x70 0x300100c0 0x0 0x40>;
> > @@ -388,7 +441,6 @@ rstgen: reset-controller@...0013000 {
> >   		uart0: serial@...0000000 {
> >   			compatible = "snps,dw-apb-uart";
> >   			reg = <0x00000070 0x40000000 0x00000000 0x00001000>;
> > -			interrupt-parent = <&intc>;
> I would prefer this change in a separated patch which has been mentioned
> upon.
> >   			interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
> >   			clock-frequency = <500000000>;
> >   			clocks = <&clkgen GATE_CLK_UART_500M>,
> > --
> > 2.45.2
> >