Commit 22dae17e authored by Steffen Trumtrar's avatar Steffen Trumtrar Committed by Mark Brown
Browse files

spi: dw-mmio: add devicetree support 



Allow probing the dw-mmio from devicetree.

Signed-off-by: default avatarSteffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 7171511e

Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt

0 → 100644
+28 −0
Original line number Diff line number Diff line 
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>;

	};

drivers/spi/spi-dw-mmio.c

+18 −1
Original line number Diff line number Diff line
@@ -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);