On Wednesday, December 30, 2015 at 12:46:23 AM, Thomas Chou wrote:
> Hi Marek,
>
> On 2015年12月29日 21:25, Marek Vasut wrote:
> > On Tuesday, December 29, 2015 at 02:00:27 PM, Thomas Chou wrote:
> >> Hi Wills,
> >>
> >> On 2015年12月29日 19:17, Wills Wang wrote:
> >>> diff --git a/arch/mips/mach-ath79/Kconfig
> >>> b/arch/mips/mach-ath79/Kconfig index 1d92a5b..b5668e9 100644
> >>> --- a/arch/mips/mach-ath79/Kconfig
> >>> +++ b/arch/mips/mach-ath79/Kconfig
> >>> @@ -15,6 +15,7 @@ config SOC_AR933X
> >>>
> >>> select SYS_MIPS_CACHE_INIT_RAM_LOAD
> >>> select MIPS_TUNE_24KC
> >>> select AR933X_UART
> >>>
> >>> + select ATH79_SPI
> >>
> >> Both AR933X_UART and ATH79_SPI should not be selected with mach Kconfig.
> >> They should go with board defconfig.
> >>
> >>> diff --git a/drivers/spi/ath79_spi.c b/drivers/spi/ath79_spi.c
> >>>
> >>> +static inline void ath79_spi_delay(int max_hz)
> >>> +{
> >>> + uint64_t tick = get_tbclk();
> >>> +
> >>> + do_div(tick, max_hz);
> >>> + tick = get_ticks() + tick + 1; /* get current timestamp */
> >>> + while (get_ticks() < tick) /* loop till event */
> >>> + /*NOP*/;
> >>> +}
> >>
> >> Use udelay() instead.
> >
> > You mean get_timer() based delay loop, yes ?
>
> Sorry, my mistake. Just realized that we don't have nano delay yet. The
> code above is fine.
Just skimming through the code, it seems like bitbanging the SPI using the
generic soft-spi driver might be easier ;-/
Best regards,
Marek Vasut
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