Commit 1814a170 authored by Lee Jones's avatar Lee Jones Committed by Linus Walleij
Browse files

dmaengine: ste_dma40: Allow driver to be probe()able when DT is enabled 



When booting using Device Tree, devices aren't registered in the normal
way. Instead, they need to be provided with a compatible string which is
held in an OF Match Table for comparison during start-up. Here we provide
the compatible string and prepare the driver to not receive a platform
data pointer.

Acked-by: default avatarVinod Koul <vnod.koul@intel.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
[Fixed up whitespace error]
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent bb75d93b

drivers/dma/ste_dma40.c

+44 −2
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/pm.h>

#include <linux/pm_runtime.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/amba/bus.h>

#include <linux/regulator/consumer.h>

#include <linux/platform_data/dma-ste-dma40.h>
@@ -3471,17 +3472,52 @@ failure: 
	return ret;

}



static int __init d40_of_probe(struct platform_device *pdev,

			       struct device_node *np)

{

	struct stedma40_platform_data *pdata;



	/*

	 * FIXME: Fill in this routine as more support is added.

	 * First platform enabled (u8500) doens't need any extra

	 * properties to run, so this is fairly sparce currently.

	 */



	pdata = devm_kzalloc(&pdev->dev,

			     sizeof(struct stedma40_platform_data),

			     GFP_KERNEL);

	if (!pdata)

		return -ENOMEM;



	pdev->dev.platform_data = pdata;



	return 0;

}



static int __init d40_probe(struct platform_device *pdev)

{

	struct stedma40_platform_data *plat_data = pdev->dev.platform_data;

	struct device_node *np = pdev->dev.of_node;

	int err;

	int ret = -ENOENT;

	struct d40_base *base;

	struct d40_base *base = NULL;

	struct resource *res = NULL;

	int num_reserved_chans;

	u32 val;



	base = d40_hw_detect_init(pdev);

	if (!plat_data) {

		if (np) {

			if(d40_of_probe(pdev, np)) {

				ret = -ENOMEM;

				goto failure;

			}

		} else {

			d40_err(&pdev->dev, "No pdata or Device Tree provided\n");

			goto failure;

		}

	}



	base = d40_hw_detect_init(pdev);

	if (!base)

		goto failure;
@@ -3655,11 +3691,17 @@ failure: 
	return ret;

}



static const struct of_device_id d40_match[] = {

        { .compatible = "stericsson,dma40", },

        {}

};



static struct platform_driver d40_driver = {

	.driver = {

		.owner = THIS_MODULE,

		.name  = D40_NAME,

		.pm = DMA40_PM_OPS,

		.of_match_table = d40_match,

	},

};

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