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spi: dw-mmio: add devicetree support
Allow probing the dw-mmio from devicetree. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
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Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
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28
Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
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@ -0,0 +1,28 @@
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Synopsys DesignWare AMBA 2.0 Synchronous Serial Interface.
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Required properties:
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- compatible : "snps,dw-apb-ssi"
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- reg : The register base for the controller.
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- interrupts : One interrupt, used by the controller.
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- #address-cells : <1>, as required by generic SPI binding.
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- #size-cells : <0>, also as required by generic SPI binding.
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Optional properties:
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- cs-gpios : Specifies the gpio pis to be used for chipselects.
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- num-cs : The number of chipselects. If omitted, this will default to 4.
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Child nodes as per the generic SPI binding.
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Example:
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spi@fff00000 {
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compatible = "snps,dw-apb-ssi";
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reg = <0xfff00000 0x1000>;
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interrupts = <0 154 4>;
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#address-cells = <1>;
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#size-cells = <0>;
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num-cs = <2>;
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cs-gpios = <&gpio0 13 0>,
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<&gpio0 14 0>;
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};
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@ -16,7 +16,9 @@
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#include <linux/spi/spi.h>
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#include <linux/spi/spi.h>
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#include <linux/scatterlist.h>
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#include <linux/scatterlist.h>
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include "spi-dw.h"
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#include "spi-dw.h"
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@ -33,6 +35,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
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struct dw_spi *dws;
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struct dw_spi *dws;
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struct resource *mem;
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struct resource *mem;
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int ret;
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int ret;
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int num_cs;
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dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
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dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
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GFP_KERNEL);
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GFP_KERNEL);
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@ -68,9 +71,16 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
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return ret;
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return ret;
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dws->bus_num = pdev->id;
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dws->bus_num = pdev->id;
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dws->num_cs = 4;
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dws->max_freq = clk_get_rate(dwsmmio->clk);
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dws->max_freq = clk_get_rate(dwsmmio->clk);
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num_cs = 4;
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if (pdev->dev.of_node)
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of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
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dws->num_cs = num_cs;
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if (pdev->dev.of_node) {
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if (pdev->dev.of_node) {
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int i;
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int i;
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@ -114,12 +124,19 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
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return 0;
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return 0;
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}
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}
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static const struct of_device_id dw_spi_mmio_of_match[] = {
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{ .compatible = "snps,dw-apb-ssi", },
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{ /* end of table */}
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};
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MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
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static struct platform_driver dw_spi_mmio_driver = {
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static struct platform_driver dw_spi_mmio_driver = {
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.probe = dw_spi_mmio_probe,
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.probe = dw_spi_mmio_probe,
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.remove = dw_spi_mmio_remove,
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.remove = dw_spi_mmio_remove,
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.driver = {
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.driver = {
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.name = DRIVER_NAME,
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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.of_match_table = dw_spi_mmio_of_match,
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},
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},
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};
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};
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module_platform_driver(dw_spi_mmio_driver);
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module_platform_driver(dw_spi_mmio_driver);
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