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OMAP: hwmod: Handle opt clocks node using clk_add_alias

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For every optional clock present per hwmod per omap-device, this function
adds an entry in the clocks list of the form <dev-id=dev_name, con-id=role>,
if an entry is already present in the list of the form <dev-id=NULL, con-id=role>.

The function is called from within the framework inside omap_device_build_ss(),
after omap_device_register.

This allows drivers to get a pointer to its optional clocks based on its role
by calling clk_get(<dev*>, <role>).

Link to discussions related to this patch:
http://www.spinics.net/lists/linux-omap/msg34809.html

Signed-off-by: Charulatha V <charu@ti.com>
Signed-off-by: Partha Basak <p-basak2@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: simplified loop iterator; removed the superfluous clk_get(),
 using the clk_get() in clk_add_alias() instead]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Partha Basak 2010-09-21 19:23:04 +02:00 committed by Paul Walmsley
parent 9980ce53c9
commit 4ef7aca895
1 changed files with 42 additions and 1 deletions
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43
arch/arm/plat-omap/omap_device.c
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@ -82,6 +82,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <plat/omap_device.h>
#include <plat/omap_hwmod.h>
@ -243,6 +244,44 @@ static inline struct omap_device *_find_by_pdev(struct platform_device *pdev)
return container_of(pdev, struct omap_device, pdev);
}
/**
* _add_optional_clock_alias - Add clock alias for hwmod optional clocks
* @od: struct omap_device *od
*
* For every optional clock present per hwmod per omap_device, this function
* adds an entry in the clocks list of the form <dev-id=dev_name, con-id=role>
* if an entry is already present in it with the form <dev-id=NULL, con-id=role>
*
* The function is called from inside omap_device_build_ss(), after
* omap_device_register.
*
* This allows drivers to get a pointer to its optional clocks based on its role
* by calling clk_get(<dev*>, <role>).
*
* No return value.
*/
static void _add_optional_clock_alias(struct omap_device *od,
struct omap_hwmod *oh)
{
int i;
for (i = 0; i < oh->opt_clks_cnt; i++) {
struct omap_hwmod_opt_clk *oc;
int r;
oc = &oh->opt_clks[i];
if (!oc->_clk)
continue;
r = clk_add_alias(oc->role, dev_name(&od->pdev.dev),
(char *)oc->clk, &od->pdev.dev);
if (r)
pr_err("omap_device: %s: clk_add_alias for %s failed\n",
dev_name(&od->pdev.dev), oc->role);
}
}
/* Public functions for use by core code */
@ -421,8 +460,10 @@ struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
else
ret = omap_device_register(od);
for (i = 0; i < oh_cnt; i++)
for (i = 0; i < oh_cnt; i++) {
hwmods[i]->od = od;
_add_optional_clock_alias(od, hwmods[i]);
}
if (ret)
goto odbs_exit4;