On 12/29/2015 09:00 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.
Ok.
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.
The minimum interval is 1usec if using udelay(), the max speed of SPI
was really limited to 1MHz.
Best regards,
Thomas
--
Best Regards
Wills
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