From mboxrd@z Thu Jan 1 00:00:00 1970 From: list-09_linux_arm@tqsc.de (Markus Niebel) Date: Fri, 18 Jul 2014 13:30:59 +0200 Subject: [PATCH] SPI: spi-imx: enable realtime master workqueue Message-ID: <1405683059-23316-1-git-send-email-list-09_linux_arm@tqsc.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Markus Niebel 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. Note: maybe useful for all SPI controllers. Signed-off-by: Markus Niebel --- .../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 at 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