Re: [PATCH v3] arm64: dts: ipq5018: Correct uart1_pins pinconf

[Ziyang Huang]

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...