Messages in this thread | | | Date | Sun, 3 Sep 2023 21:11:16 +0800 | Subject | Re: [PATCH v3] arm64: dts: ipq5018: Correct uart1_pins pinconf | From | Ziyang Huang <> |
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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...
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