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author | Jonas Gorski <jogo@openwrt.org> | 2015-12-02 22:23:22 +0000 |
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committer | Jonas Gorski <jogo@openwrt.org> | 2015-12-02 22:23:22 +0000 |
commit | 621677154f39f2e0b698a558b8b795db84a8e014 (patch) | |
tree | 3c4d60241f9ad7f52f12aa022af8b5a684b2ab08 /target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch | |
parent | 4454a3fb6375cf1adf17f63a54cd7660bc40caa7 (diff) | |
download | upstream-621677154f39f2e0b698a558b8b795db84a8e014.tar.gz upstream-621677154f39f2e0b698a558b8b795db84a8e014.tar.bz2 upstream-621677154f39f2e0b698a558b8b795db84a8e014.zip |
kernel: add linux 4.4 support
Based on 4.4-rc3. Runtime tested on MIPS.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
SVN-Revision: 47701
Diffstat (limited to 'target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch')
-rw-r--r-- | target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch b/target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch new file mode 100644 index 0000000000..fc1b40c035 --- /dev/null +++ b/target/linux/generic/patches-4.4/861-04_spi_gpio_implement_spi_delay.patch @@ -0,0 +1,58 @@ +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 +@@ -17,6 +17,7 @@ + #include <linux/module.h> + #include <linux/platform_device.h> + #include <linux/gpio.h> ++#include <linux/delay.h> + #include <linux/of.h> + #include <linux/of_device.h> + #include <linux/of_gpio.h> +@@ -69,6 +70,7 @@ 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" + */ + +@@ -76,6 +78,7 @@ 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) +@@ -126,12 +129,20 @@ 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" + |