linux-kernel - Re: [PATCH v2 11/12] arm64: dts: exynos: gs101: define USI8 with I2C configuration

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Date: Fri, 29 Dec 2023 08:04:21 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: André Draszik <andre.draszik@...aro.org>,
 peter.griffin@...aro.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, mturquette@...libre.com,
 sboyd@...nel.org, conor+dt@...nel.org, andi.shyti@...nel.org,
 alim.akhtar@...sung.com, gregkh@...uxfoundation.org, jirislaby@...nel.org,
 s.nawrocki@...sung.com, tomasz.figa@...il.com, cw00.choi@...sung.com,
 arnd@...db.de, semen.protsenko@...aro.org
Cc: saravanak@...gle.com, willmcvicker@...gle.com,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-serial@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v2 11/12] arm64: dts: exynos: gs101: define USI8 with I2C
 configuration



On 12/28/23 14:04, André Draszik wrote:
> Hi Tudor,

Hi!

> 
> On Thu, 2023-12-28 at 12:58 +0000, Tudor Ambarus wrote:
>> [...]
>>
>> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
>> index 0e5b1b490b0b..c6ae33016992 100644
>> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
>> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
>> @@ -354,6 +354,35 @@ pinctrl_peric0: pinctrl@...40000 {
>>  			interrupts = <GIC_SPI 625 IRQ_TYPE_LEVEL_HIGH 0>;
>>  		};
>>  
>> +		usi8: usi@...700c0 {
>> +			compatible = "google,gs101-usi",
>> +				     "samsung,exynos850-usi";
>> +			reg = <0x109700c0 0x20>;
>> +			ranges;
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7>,
>> +				 <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI8_USI_CLK>;
>> +			clock-names = "pclk", "ipclk";
> 
> Given the clock-names, shouldn't the clock indices be the other way around? Also see below.

You're right, they should have been the other way around! Didn't make
any difference at testing because the usi driver uses
clk_bulk_prepare_enable(), what matters is the order of clocks in the
i2c node, and those are fine.

> 
>> +			samsung,sysreg = <&sysreg_peric0 0x101c>;
>> +			status = "disabled";
>> +
>> +			hsi2c_8: i2c@...70000 {
>> +				compatible = "google,gs101-hsi2c",
>> +					     "samsung,exynosautov9-hsi2c";
>> +				reg = <0x10970000 0xc0>;
>> +				interrupts = <GIC_SPI 642 IRQ_TYPE_LEVEL_HIGH 0>;
>> +				#address-cells = <1>;
>> +				#size-cells = <0>;
>> +				pinctrl-names = "default";
>> +				pinctrl-0 = <&hsi2c8_bus>;
>> +				clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7>,
>> +					 <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI8_USI_CLK>;
>> +				clock-names = "hsi2c", "hsi2c_pclk";
> 
> Here, pclk == CLK_GOUT_PERIC0_CLK_PERIC0_USI8_USI_CLK (which is correct, I believe), whereas
> above pclk == CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7
> 

Indeed, I'll reverse the order for the USI clocks and do some more
testing. Thanks!
ta