openwrt/upstream - upstream openwrt

	Commit message (Expand)	Author	Age	Files	Lines
*	kernel: add missing dependency for kmod-fs-nfs	Felix Fietkau	2014-06-08	1	-1/+1
*	kernel: Add kernel module for cramfs support.	Hauke Mehrtens	2014-05-01	1	-0/+15
*	fs: add kernel modules for AFS client	Zoltan Herpai	2014-04-28	1	-0/+37
*	kernel: negate kernel version dependencies to fix config for new kernel versions	Hauke Mehrtens	2014-02-08	1	-1/+1
*	kernel: kmod-fs-jfs	Hauke Mehrtens	2014-02-05	1	-0/+16
*	linux: don't break kmod-fs-nfs for Kernels < 3.6.x	Jo-Philipp Wich	2014-02-04	1	-0/+5
*	linux: fix kmod-fs-nfs to include nfsv3.ko, it was split out of nfs.ko in Lin...	Jo-Philipp Wich	2014-02-04	1	-2/+3
*	fix 3.12 dependencies	Zoltan Herpai	2014-01-13	1	-1/+1
*	kernel: kmod-fs-xfs: fix dependencies	Hauke Mehrtens	2013-09-05	1	-1/+1
*	kernel: be consistent with formatting style	Luka Perkov	2013-07-26	1	-2/+2
*	kernel: fix kmod-fs-btrfs dependencies	Hauke Mehrtens	2013-07-19	1	-1/+1
*	linux: add missing dependencies to kmod-fs-msdos and kmod-fs-xfs	Jo-Philipp Wich	2013-07-18	1	-1/+2
*	kernel: btrfs supports raid6 in 3.10, thus depends on lib-raid6	Jonas Gorski	2013-07-18	1	-1/+1
*	packages: clean up the package folder	John Crispin	2013-06-21	1	-0/+372

Implement the SPI-GPIO delay function for busses that need speed limitation. --mb --- a/drivers/spi/spi-gpio.c +++ b/drivers/spi/spi-gpio.c @@ -22,6 +22,7 @@ #include <linux/init.h> #include <linux/platform_device.h> #include <linux/gpio.h> +#include <linux/delay.h> #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> @@ -70,6 +71,7 @@ struct spi_gpio { * #define SPI_MOSI_GPIO 120 * #define SPI_SCK_GPIO 121 * #define SPI_N_CHIPSEL 4 + * #undef NEED_SPIDELAY * #include "spi-gpio.c" */ @@ -77,6 +79,7 @@ struct spi_gpio { #define DRIVER_NAME "spi_gpio" #define GENERIC_BITBANG /* vs tight inlines */ +#define NEED_SPIDELAY 1 /* all functions referencing these symbols must define pdata */ #define SPI_MISO_GPIO ((pdata)->miso) @@ -121,12 +124,20 @@ static inline int getmiso(const struct s #undef pdata /* - * NOTE: this clocks "as fast as we can". It "should" be a function of the - * requested device clock. Software overhead means we usually have trouble - * reaching even one Mbit/sec (except when we can inline bitops), so for now - * we'll just assume we never need additional per-bit slowdowns. + * NOTE: to clock "as fast as we can", set spi_device.max_speed_hz + * and spi_transfer.speed_hz to 0. + * Otherwise this is a function of the requested device clock. + * Software overhead means we usually have trouble + * reaching even one Mbit/sec (except when we can inline bitops). So on small + * embedded devices with fast SPI slaves you usually don't need a delay. */ -#define spidelay(nsecs) do {} while (0) +static inline void spidelay(unsigned nsecs) +{ +#ifdef NEED_SPIDELAY + if (unlikely(nsecs)) + ndelay(nsecs); +#endif /* NEED_SPIDELAY */ +} #include "spi-bitbang-txrx.h"