linux-kernel - Re: [PATCH v9 6/8] riscv: dts: spacemit: enable the i2c8 adapter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <bcab3c8d-af99-44c7-a994-b5e0e5c39c7f@riscstar.com>
Date: Fri, 25 Jul 2025 07:27:18 -0500
From: Alex Elder <elder@...cstar.com>
To: Yixun Lan <dlan@...too.org>
Cc: lee@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
 alexandre.belloni@...tlin.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, mat.jonczyk@...pl, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
 linux.amoon@...il.com, troymitchell988@...il.com, guodong@...cstar.com,
 linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 6/8] riscv: dts: spacemit: enable the i2c8 adapter

On 7/24/25 4:11 PM, Yixun Lan wrote:
> Hi Alex,
> 
> On 15:25 Thu 24 Jul     , Alex Elder wrote:
>> Define properties for the I2C adapter that provides access to the
>> SpacemiT P1 PMIC.  Enable this adapter on the Banana Pi BPI-F3.
>>
>> Signed-off-by: Alex Elder <elder@...cstar.com>
>> ---
>>   arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts | 15 +++++++++++++++
>>   arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi    |  7 +++++++
>>   arch/riscv/boot/dts/spacemit/k1.dtsi            | 11 +++++++++++
>>   3 files changed, 33 insertions(+)
>>
>> diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
>> index fe22c747c5012..7c9f91c88e01a 100644
>> --- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
>> +++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
>> @@ -40,6 +40,21 @@ &emmc {
>>   	status = "okay";
>>   };
>>   
>> +&i2c8 {
>> +	pinctrl-0 = <&i2c8_cfg>;
>> +	pinctrl-names = "default";
> ..
>> +	#address-cells = <1>;
>> +	#size-cells = <0>;
> I think these two can be moved into dtsi, as they are
> common and fixed properties for the i2c controller

You're right.  I will update this in v10, which I will
send later today.  I'd like to hear from Lee before I
prepare that though.

>> +	status = "okay";
>> +
>> +	pmic@41 {
>> +		compatible = "spacemit,p1";
>> +		reg = <0x41>;
>> +		interrupts = <64>;
> ..
>> +		status = "okay";
> status property here can be dropped as enabled by default

OK.

>> +	};
>> +};
>> +
>>   &uart0 {
>>   	pinctrl-names = "default";
>>   	pinctrl-0 = <&uart0_2_cfg>;
>> diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
>> index 3810557374228..96d7a46d4bf77 100644
>> --- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
>> +++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
>> @@ -11,6 +11,13 @@
>>   #define K1_GPIO(x)	(x / 32) (x % 32)
>>   
>>   &pinctrl {
>> +	i2c8_cfg: i2c8-cfg {
>> +		i2c8-0-pins {
>> +			pinmux = <K1_PADCONF(93, 0)>,	/* PWR_SCL */
>> +				 <K1_PADCONF(94, 0)>;	/* PWR_SDA */
>> +		};
>> +	};
>> +
>>   	uart0_2_cfg: uart0-2-cfg {
>>   		uart0-2-pins {
>>   			pinmux = <K1_PADCONF(68, 2)>,
>> diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
>> index abde8bb07c95c..2a5a132d5a774 100644
>> --- a/arch/riscv/boot/dts/spacemit/k1.dtsi
>> +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
>> @@ -459,6 +459,17 @@ pwm7: pwm@...1bc00 {
>>   			status = "disabled";
>>   		};
>>   
>> +		i2c8: i2c@...1d800 {
>> +			compatible = "spacemit,k1-i2c";
>> +			reg = <0x0 0xd401d800 0x0 0x38>;
> ..
>> +			interrupts = <19>;
> I'd suggest to move interrupts property after clock, see my similar
> comment
> https://lore.kernel.org/all/20250724121916-GYA748228@gentoo/

OK.

					-Alex

> 
>> +			clocks = <&syscon_apbc CLK_TWSI8>,
>> +				 <&syscon_apbc CLK_TWSI8_BUS>;
>> +			clock-names = "func", "bus";
>> +			clock-frequency = <400000>;
>> +			status = "disabled";
>> +		};
>> +
>>   		pinctrl: pinctrl@...1e000 {
>>   			compatible = "spacemit,k1-pinctrl";
>>   			reg = <0x0 0xd401e000 0x0 0x400>;
>> -- 
>> 2.43.0
>>
>