| Message ID | 1405683059-23316-1-git-send-email-list-09_linux_arm@tqsc.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jul 18, 2014 at 01:30:59PM +0200, Markus Niebel wrote: > From: Markus Niebel <Markus.Niebel@tq-group.de> > > SPI master provides an option to run the SPI workqueue > with realtime prio. This feature is currently used only > by spi-pl022. > > Support this feature for spi-imx by parsing an optional > bool value from device tree. This sounds like a Linux specific feature/implementation, so shouldn't be a decision of device tree. Shawn > > Note: maybe useful for all SPI controllers. > > Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.de> > --- > .../devicetree/bindings/spi/fsl-imx-cspi.txt | 4 ++++ > drivers/spi/spi-imx.c | 1 + > 2 files changed, 5 insertions(+) > > diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt > index 4256a6d..6b908c7 100644 > --- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt > +++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt > @@ -8,6 +8,10 @@ Required properties: > - fsl,spi-num-chipselects : Contains the number of the chipselect > - cs-gpios : Specifies the gpio pins to be used for chipselects. > > +Optional properties: > +- fsl,rt : indicates the controller should run the message pump with realtime > + priority to minimise the transfer latency on the bus (boolean) > + > Example: > > ecspi@70010000 { > diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c > index 5daff20..3a9c373 100644 > --- a/drivers/spi/spi-imx.c > +++ b/drivers/spi/spi-imx.c > @@ -835,6 +835,7 @@ static int spi_imx_probe(struct platform_device *pdev) > master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); > master->bus_num = pdev->id; > master->num_chipselect = num_cs; > + master->rt = of_property_read_bool(np, "fsl,rt"); > > spi_imx = spi_master_get_devdata(master); > spi_imx->bitbang.master = master; > -- > 1.7.9.5 >
diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt index 4256a6d..6b908c7 100644 --- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt +++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt @@ -8,6 +8,10 @@ Required properties: - fsl,spi-num-chipselects : Contains the number of the chipselect - cs-gpios : Specifies the gpio pins to be used for chipselects. +Optional properties: +- fsl,rt : indicates the controller should run the message pump with realtime + priority to minimise the transfer latency on the bus (boolean) + Example: ecspi@70010000 { diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 5daff20..3a9c373 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -835,6 +835,7 @@ static int spi_imx_probe(struct platform_device *pdev) master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); master->bus_num = pdev->id; master->num_chipselect = num_cs; + master->rt = of_property_read_bool(np, "fsl,rt"); spi_imx = spi_master_get_devdata(master); spi_imx->bitbang.master = master;