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

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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: Vinod Koul <vnod.koul@intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[Fixed up whitespace error]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Lee Jones 2013-05-03 15:32:11 +01:00 committed by Linus Walleij
parent bb75d93b90
commit 1814a1703c
1 changed files with 44 additions and 2 deletions
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46
drivers/dma/ste_dma40.c
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@ -17,6 +17,7 @@
#include <linux/pm.h> #include <linux/pm.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/of.h>
#include <linux/amba/bus.h> #include <linux/amba/bus.h>
#include <linux/regulator/consumer.h> #include <linux/regulator/consumer.h>
#include <linux/platform_data/dma-ste-dma40.h> #include <linux/platform_data/dma-ste-dma40.h>
@ -3471,17 +3472,52 @@ failure:
return ret; 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) 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 err;
int ret = -ENOENT; int ret = -ENOENT;
struct d40_base *base; struct d40_base *base = NULL;
struct resource *res = NULL; struct resource *res = NULL;
int num_reserved_chans; int num_reserved_chans;
u32 val; 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) if (!base)
goto failure; goto failure;
@ -3655,11 +3691,17 @@ failure:
return ret; return ret;
} }
static const struct of_device_id d40_match[] = {
{ .compatible = "stericsson,dma40", },
{}
};
static struct platform_driver d40_driver = { static struct platform_driver d40_driver = {
.driver = { .driver = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.name = D40_NAME, .name = D40_NAME,
.pm = DMA40_PM_OPS, .pm = DMA40_PM_OPS,
.of_match_table = d40_match,
}, },
}; };