linux-kernel - Re: [PATCH 3/4] arm64: dts: qcom: sa8540p-ride: add qup1_i2c15 and qup2

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Message-ID: <309b3fad-933c-6c45-5cd7-4e082da62c15@linaro.org>
Date:   Tue, 13 Dec 2022 15:48:27 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Brian Masney <bmasney@...hat.com>, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     robh+dt@...nel.org, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ahalaney@...hat.com,
        echanude@...hat.com, quic_shazhuss@...cinc.com
Subject: Re: [PATCH 3/4] arm64: dts: qcom: sa8540p-ride: add qup1_i2c15 and
 qup2_i2c18 nodes



On 12.12.2022 19:23, Brian Masney wrote:
> Add the necessary nodes in order to get qup1_i2c15 and qup2_i2c18
> functioning on the automotive board and exposed to userspace.
> 
> This work was derived from various patches that Qualcomm delivered
> to Red Hat in a downstream kernel. This change was validated by using
> i2c-tools 4.3.3 on CentOS Stream 9:
> 
> [root@...alhost ~]# i2cdetect -l
> i2c-15  i2c             Geni-I2C                                I2C adapter
> i2c-18  i2c             Geni-I2C                                I2C adapter
> 
> [root@...alhost ~]# i2cdetect -a -y 15
> Warning: Can't use SMBus Quick Write command, will skip some addresses
>      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
> 00:
> 10:
> 20:
> 30: -- -- -- -- -- -- -- --
> 40:
> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 60:
> 70:
> 
> Bus 18 has the same output. I validated that we get the same output on
> the downstream kernel.
> 
> Signed-off-by: Brian Masney <bmasney@...hat.com>
> ---
>  arch/arm64/boot/dts/qcom/sa8540p-ride.dts | 46 +++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
> index d70859803fbd..6dc3f3ff8ece 100644
> --- a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
> +++ b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
> @@ -17,6 +17,8 @@ / {
>  	compatible = "qcom,sa8540p-ride", "qcom,sa8540p";
>  
>  	aliases {
> +		i2c15 = &qup1_i2c15;
> +		i2c18 = &qup2_i2c18;
>  		serial0 = &qup2_uart17;
>  	};
>  
> @@ -188,10 +190,28 @@ &pcie3a_phy {
>  	status = "okay";
>  };
>  
> +&qup1 {
> +	status = "okay";
> +};
> +
> +&qup1_i2c15 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&qup1_i2c15_default>;
> +
> +	status = "okay";
> +};
> +
>  &qup2 {
>  	status = "okay";
>  };
>  
> +&qup2_i2c18 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&qup2_i2c18_default>;
> +
> +	status = "okay";
> +};
> +
>  &qup2_uart17 {
>  	compatible = "qcom,geni-debug-uart";
>  	status = "okay";
> @@ -313,4 +333,30 @@ wake-pins {
>  			bias-pull-up;
>  		};
>  	};
> +
> +	qup1_i2c15_default: qup1-i2c15-state {
You can drop mux/config-pins and have the pin properties live directly
under the qup1-i2cN-state node.

Konrad
> +		mux-pins {
> +			pins = "gpio36", "gpio37";
> +			function = "qup15";
> +		};
> +
> +		config-pins {
> +			pins = "gpio36", "gpio37";
> +			drive-strength = <0x02>;
> +			bias-pull-up;
> +		};
> +	};
> +
> +	qup2_i2c18_default: qup2-i2c18-state {
> +		mux-pins {
> +			pins = "gpio66", "gpio67";
> +			function = "qup18";
> +		};
> +
> +		config-pins {
> +			pins = "gpio66", "gpio67";
> +			drive-strength = <0x02>;
> +			bias-pull-up;
> +		};
> +	};
>  };