| Message ID | 1450352427-25350-2-git-send-email-mweseloh42@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Dec 17, 2015 at 12:40:26PM +0100, Marcus Weseloh wrote: > Adds a new property "spi-word-wait-ns" to the spi-bus binding that allows > SPI slave devices to set a wait time between the transmission of words. > > Signed-off-by: Marcus Weseloh <mweseloh42@gmail.com> Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com> Thanks! Maxime
On Thu, Dec 17, 2015 at 12:40:26PM +0100, Marcus Weseloh wrote: > Adds a new property "spi-word-wait-ns" to the spi-bus binding that allows > SPI slave devices to set a wait time between the transmission of words. > > Signed-off-by: Marcus Weseloh <mweseloh42@gmail.com> > --- > Documentation/devicetree/bindings/spi/spi-bus.txt | 2 ++ > drivers/spi/spi.c | 2 ++ > include/linux/spi/spi.h | 2 ++ > 3 files changed, 6 insertions(+) Acked-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index bbaa857..434d321 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -61,6 +61,8 @@ contain the following properties. used for MOSI. Defaults to 1 if not present. - spi-rx-bus-width - (optional) The bus width(number of data wires) that used for MISO. Defaults to 1 if not present. +- spi-word-wait-ns - (optional) Delay between transmission of words + in nanoseconds Some SPI controllers and devices support Dual and Quad SPI transfer mode. It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD). diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 2b0a8ec..186373b 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1467,6 +1467,8 @@ of_register_spi_device(struct spi_master *master, struct device_node *nc) if (of_find_property(nc, "spi-lsb-first", NULL)) spi->mode |= SPI_LSB_FIRST; + of_property_read_u32(nc, "spi-word-wait-ns", &spi->word_wait_ns); + /* Device DUAL/QUAD mode */ if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { switch (value) { diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index cce80e6..ea3037f 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -118,6 +118,7 @@ void spi_statistics_add_transfer_stats(struct spi_statistics *stats, * for driver coldplugging, and in uevents used for hotplugging * @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when * when not using a GPIO line) + * @word_wait_ns: A wait time between word transfers in nanoseconds * * @statistics: statistics for the spi_device * @@ -158,6 +159,7 @@ struct spi_device { void *controller_data; char modalias[SPI_NAME_SIZE]; int cs_gpio; /* chip select gpio */ + u32 word_wait_ns; /* wait time between words */ /* the statistics */ struct spi_statistics statistics;
Adds a new property "spi-word-wait-ns" to the spi-bus binding that allows SPI slave devices to set a wait time between the transmission of words. Signed-off-by: Marcus Weseloh <mweseloh42@gmail.com> --- Documentation/devicetree/bindings/spi/spi-bus.txt | 2 ++ drivers/spi/spi.c | 2 ++ include/linux/spi/spi.h | 2 ++ 3 files changed, 6 insertions(+)