On Tue, Oct 1, 2024 at 4:18 PM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > > On Thu, Sep 19, 2024 at 11:43 AM Billy Tsai <billy_tsai@xxxxxxxxxxxxxx> 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> > > If this applies cleanly on mainline I think it should go into fixes as-is. > > Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > > Yours, > Linus Walleij I agree but it doesn't. :( Billy: please send it separately and - while at it - use a C-style comment. Bart
