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

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Date:   Sun, 3 Sep 2023 21:11:16 +0800
From:   Ziyang Huang <hzyitc@...look.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     agross@...nel.org, 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

在 2023/9/2 20:22, Konrad Dybcio 写道:
> 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

Because it is configurable. Please read my previous email.

And these two groups can be connected at same time. This is what u-boot 
does. It just like the parallel circuit. So there can be "or/and". lol...