linux-kernel - Re: [PATCH v3] arm64: dts: ipq5018: Correct uart1

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Message-ID: <295f0c31-3612-428c-849b-9469a6136f47@linaro.org>
Date:   Sat, 2 Sep 2023 14:22:53 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Ziyang Huang <hzyitc@...look.com>, agross@...nel.org
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        quic_gokulsri@...cinc.com, quic_srichara@...cinc.com,
        quic_varada@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: ipq5018: Correct uart1_pins pinconf

On 1.09.2023 16:10, Ziyang Huang wrote:
> In pinctrl, the pinconfigs for uart are named "blspX_uartY".
>   X is the UART ID. Starts from 1.
>     1-6 are in BLSP Block 1.
>     7-12 are in BLSP Block 2.
>   Y is the index of mux config. Starts from 0.
> 
> In dts, the serials are also named "blspX_uartY", but with different logic.
>   X is the BLSP Block ID. Starts from 1.
>   Y is the uart id inside block.
>     In "ipq6018.dtsi" and "ipq8074.dtsi", it starts from 1.
>     But in "ipq5332.dtsi" and "ipq9574.dtsi", it starts from 0.
> 
> +-----------------+-----------------+-------------+-----------------+
> |     Block ID    | ID inside Block |  dts name   | pinconfig name  |
> | (Starts from 1) | (Starts from 1) |             |                 |
> +-----------------+-----------------+-------------+-----------------+
> |        1        |        1        | blsp1_uart1 |   blsp0_uartY   |
> |        1        |        2        | blsp1_uart2 |   blsp1_uartY   |
> |        1        |        6        | blsp1_uart6 |   blsp5_uartY   |
> |        2        |        1        | blsp2_uart1 |   blsp6_uartY   |
> |        2        |        6        | blsp2_uart6 |   blsp12_uartY  |
> +-----------------+-----------------+-------------+-----------------+
> 
> In "ipq5018.dts", "blsp1_uart1" (dts name) is the first serial (confimed
> by the address), So its pinconfig should be "blsp0_uart0" (pinconfig name,
> use GPIO 20 and 21) or "blsp0_uart1" (pinconfig name, use GPIO 28 and 29).
Surely only one pair of wires is connected? Why is there an "OR"?

Konrad