Re: [PATCH v3 6/6] gpio: aspeed: Add the flush write to ensure the write complete.

[Andrew Jeffery]

On Fri, 2024-09-13 at 15:43 +0800, Billy Tsai wrote:
> Performing a dummy read ensures that the register write operation is fully
> completed, mitigating any potential bus delays that could otherwise impact
> the frequency of bitbang usage. E.g., if the JTAG application uses GPIO to
> control the JTAG pins (TCK, TMS, TDI, TDO, and TRST), and the application
> sets the TCK clock to 1 MHz, the GPIO’s high/low transitions will rely on
> a delay function to ensure the clock frequency does not exceed 1 MHz.
> However, this can lead to rapid toggling of the GPIO because the write
> operation is POSTed and does not wait for a bus acknowledgment.
> 
> Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx>

... are you aware of any other driver concerns of a similar nature wrt
the architecture of the SoCs?