diff options
| -rw-r--r-- | Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt | 28 | ||||
| -rw-r--r-- | drivers/spi/spi-dw-mmio.c | 19 |
2 files changed, 46 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt new file mode 100644 index 000000000000..bd99193e87b9 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt @@ -0,0 +1,28 @@ +Synopsys DesignWare AMBA 2.0 Synchronous Serial Interface. + +Required properties: +- compatible : "snps,dw-apb-ssi" +- reg : The register base for the controller. +- interrupts : One interrupt, used by the controller. +- #address-cells : <1>, as required by generic SPI binding. +- #size-cells : <0>, also as required by generic SPI binding. + +Optional properties: +- cs-gpios : Specifies the gpio pis to be used for chipselects. +- num-cs : The number of chipselects. If omitted, this will default to 4. + +Child nodes as per the generic SPI binding. + +Example: + + spi@fff00000 { + compatible = "snps,dw-apb-ssi"; + reg = <0xfff00000 0x1000>; + interrupts = <0 154 4>; + #address-cells = <1>; + #size-cells = <0>; + num-cs = <2>; + cs-gpios = <&gpio0 13 0>, + <&gpio0 14 0>; + }; + diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index a5cba14ac3d2..21ce0e36fa00 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -16,7 +16,9 @@ #include <linux/spi/spi.h> #include <linux/scatterlist.h> #include <linux/module.h> +#include <linux/of.h> #include <linux/of_gpio.h> +#include <linux/of_platform.h> #include "spi-dw.h" @@ -33,6 +35,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) struct dw_spi *dws; struct resource *mem; int ret; + int num_cs; dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), GFP_KERNEL); @@ -68,9 +71,16 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) return ret; dws->bus_num = pdev->id; - dws->num_cs = 4; + dws->max_freq = clk_get_rate(dwsmmio->clk); + num_cs = 4; + + if (pdev->dev.of_node) + of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs); + + dws->num_cs = num_cs; + if (pdev->dev.of_node) { int i; @@ -114,12 +124,19 @@ static int dw_spi_mmio_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id dw_spi_mmio_of_match[] = { + { .compatible = "snps,dw-apb-ssi", }, + { /* end of table */} +}; +MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); + static struct platform_driver dw_spi_mmio_driver = { .probe = dw_spi_mmio_probe, .remove = dw_spi_mmio_remove, .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, + .of_match_table = dw_spi_mmio_of_match, }, }; module_platform_driver(dw_spi_mmio_driver); |