[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <TYZPR01MB5556EB1FEA752CE30FC6F64DC9EAA@TYZPR01MB5556.apcprd01.prod.exchangelabs.com>
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...
Powered by blists - more mailing lists