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ARM: OMAP: omap_device: Add omap_device_get_by_hwmod_name

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An API which translates a standard hwmod name to corresponding
platform_device is useful for drivers when they need to look up the
device associated with a hwmod name to map back into the device
structure pointers. These ideally should be used by drivers in
mach directory. Using a generic hwmod name like "gpu" instead of
the actual device name which could change in the future, allows
us to:
a) Could in effect help replace apis such as omap2_get_mpuss_device,
omap2_get_iva_device, omap2_get_l3_device, omap4_get_dsp_device,
etc..
b) Scale to more devices rather than be restricted to named functions
c) Simplify driver's platform_data from passing additional fields
all doing the same thing with different function pointer names
just for accessing a different device name.

Signed-off-by: Nishanth Menon <nm@ti.com>
[b-cousson@ti.com: Adapt it to the new pdev pointer inside od,
remove the unneeded helpers, and fold the next patch here]
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Nishanth Menon
2011-07-27 15:02:32 -05:00
committed by Kevin Hilman
parent c541c15fb5
commit 1f8a7d5207
2 changed files with 37 additions and 0 deletions
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1
arch/arm/plat-omap/include/plat/omap_device.h
View File

@ -101,6 +101,7 @@ struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
int pm_lats_cnt, int is_early_device);
void __iomem *omap_device_get_rt_va(struct omap_device *od);
struct device *omap_device_get_by_hwmod_name(const char *oh_name);
/* OMAP PM interface */
int omap_device_align_pm_lat(struct platform_device *pdev,

36
arch/arm/plat-omap/omap_device.c
View File

@ -844,6 +844,42 @@ void __iomem *omap_device_get_rt_va(struct omap_device *od)
return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
}
/**
* omap_device_get_by_hwmod_name() - convert a hwmod name to
* device pointer.
* @oh_name: name of the hwmod device
*
* Returns back a struct device * pointer associated with a hwmod
* device represented by a hwmod_name
*/
struct device *omap_device_get_by_hwmod_name(const char *oh_name)
{
struct omap_hwmod *oh;
if (!oh_name) {
WARN(1, "%s: no hwmod name!\n", __func__);
return ERR_PTR(-EINVAL);
}
oh = omap_hwmod_lookup(oh_name);
if (IS_ERR_OR_NULL(oh)) {
WARN(1, "%s: no hwmod for %s\n", __func__,
oh_name);
return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV);
}
if (IS_ERR_OR_NULL(oh->od)) {
WARN(1, "%s: no omap_device for %s\n", __func__,
oh_name);
return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV);
}
if (IS_ERR_OR_NULL(oh->od->pdev))
return ERR_PTR(oh->od->pdev ? PTR_ERR(oh->od->pdev) : -ENODEV);
return &oh->od->pdev->dev;
}
EXPORT_SYMBOL(omap_device_get_by_hwmod_name);
/*
* Public functions intended for use in omap_device_pm_latency
* .activate_func and .deactivate_func function pointers