[RFC/PATCH 7/7] WIP: HACK/RFC: omap_device: begin to decouple platform_device from omap_device
Kevin Hilman
khilman at ti.com
Fri Jul 22 09:52:18 EST 2011
Rather than embedding a struct platform_device inside a struct
omap_device, decouple them, leaving only a pointer to the
platform_device inside the omap_device.
This patch uses devres to allocate and attach the omap_device to the
struct device, so finding an omap_device from a struct device means
using devres_find(), and the to_omap_device() helper function was
modified accordingly.
RFC/Hack alert:
Currently the driver core (drivers/base/dd.c) doesn't expect any
devres resources to exist before the driver's ->probe() is called. In
this patch, I just comment out the warning, but we'll need to
understand why that limitation exists, and if it's a real limitation.
A first glance suggests that it's not really needed. If this is a
true limitation, we'll need to find some way other than devres to
attach an omap_device to a struct device.
On OMAP, we will need an omap_device attached to a struct device
before probe because device HW may be disabled in probe and drivers
are expected to use runtime PM in ->probe() to activate the hardware
before access. Because the runtime PM API calls use omap_device (via
our PM domain layer), we need omap_device attached to a
platform_device before probe.
---
arch/arm/mach-omap2/opp.c | 2 +-
arch/arm/plat-omap/include/plat/omap_device.h | 4 +-
arch/arm/plat-omap/omap_device.c | 78 +++++++++++++++----------
drivers/base/dd.c | 2 +-
4 files changed, 50 insertions(+), 36 deletions(-)
diff --git a/arch/arm/mach-omap2/opp.c b/arch/arm/mach-omap2/opp.c
index ab8b35b..9262a6b 100644
--- a/arch/arm/mach-omap2/opp.c
+++ b/arch/arm/mach-omap2/opp.c
@@ -69,7 +69,7 @@ int __init omap_init_opp_table(struct omap_opp_def *opp_def,
opp_def->hwmod_name, i);
return -EINVAL;
}
- dev = &oh->od->pdev.dev;
+ dev = &oh->od->pdev->dev;
r = opp_add(dev, opp_def->freq, opp_def->u_volt);
if (r) {
diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 7a3ec4f..6bd4f6f 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -64,7 +64,7 @@ extern struct device omap_device_parent;
*
*/
struct omap_device {
- struct platform_device pdev;
+ struct platform_device *pdev;
struct omap_hwmod **hwmods;
struct omap_device_pm_latency *pm_lats;
u32 dev_wakeup_lat;
@@ -142,6 +142,6 @@ struct omap_device_pm_latency {
#define OMAP_DEVICE_LATENCY_AUTO_ADJUST BIT(1)
/* Get omap_device pointer from platform_device pointer */
-#define to_omap_device(x) container_of((x), struct omap_device, pdev)
+struct omap_device *to_omap_device(struct platform_device *pdev);
#endif
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index c420b94..52ce013 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -117,7 +117,7 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
{
struct timespec a, b, c;
- dev_dbg(&od->pdev.dev, "omap_device: activating\n");
+ dev_dbg(&od->pdev->dev, "omap_device: activating\n");
while (od->pm_lat_level > 0) {
struct omap_device_pm_latency *odpl;
@@ -141,7 +141,7 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
c = timespec_sub(b, a);
act_lat = timespec_to_ns(&c);
- dev_dbg(&od->pdev.dev,
+ dev_dbg(&od->pdev->dev,
"omap_device: pm_lat %d: activate: elapsed time "
"%llu nsec\n", od->pm_lat_level, act_lat);
@@ -149,12 +149,12 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
odpl->activate_lat_worst = act_lat;
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
odpl->activate_lat = act_lat;
- dev_warn(&od->pdev.dev,
+ dev_warn(&od->pdev->dev,
"new worst case activate latency "
"%d: %llu\n",
od->pm_lat_level, act_lat);
} else
- dev_warn(&od->pdev.dev,
+ dev_warn(&od->pdev->dev,
"activate latency %d "
"higher than exptected. (%llu > %d)\n",
od->pm_lat_level, act_lat,
@@ -185,7 +185,7 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
{
struct timespec a, b, c;
- dev_dbg(&od->pdev.dev, "omap_device: deactivating\n");
+ dev_dbg(&od->pdev->dev, "omap_device: deactivating\n");
while (od->pm_lat_level < od->pm_lats_cnt) {
struct omap_device_pm_latency *odpl;
@@ -208,7 +208,7 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
c = timespec_sub(b, a);
deact_lat = timespec_to_ns(&c);
- dev_dbg(&od->pdev.dev,
+ dev_dbg(&od->pdev->dev,
"omap_device: pm_lat %d: deactivate: elapsed time "
"%llu nsec\n", od->pm_lat_level, deact_lat);
@@ -216,12 +216,12 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
odpl->deactivate_lat_worst = deact_lat;
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
odpl->deactivate_lat = deact_lat;
- dev_warn(&od->pdev.dev,
+ dev_warn(&od->pdev->dev,
"new worst case deactivate latency "
"%d: %llu\n",
od->pm_lat_level, deact_lat);
} else
- dev_warn(&od->pdev.dev,
+ dev_warn(&od->pdev->dev,
"deactivate latency %d "
"higher than exptected. (%llu > %d)\n",
od->pm_lat_level, deact_lat,
@@ -245,11 +245,11 @@ static void _add_clkdev(struct omap_device *od, const char *clk_alias,
if (!clk_alias || !clk_name)
return;
- dev_dbg(&od->pdev.dev, "Creating %s -> %s\n", clk_alias, clk_name);
+ dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
- r = clk_get_sys(dev_name(&od->pdev.dev), clk_alias);
+ r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
if (!IS_ERR(r)) {
- dev_warn(&od->pdev.dev,
+ dev_warn(&od->pdev->dev,
"alias %s already exists\n", clk_alias);
clk_put(r);
return;
@@ -257,14 +257,14 @@ static void _add_clkdev(struct omap_device *od, const char *clk_alias,
r = omap_clk_get_by_name(clk_name);
if (IS_ERR(r)) {
- dev_err(&od->pdev.dev,
+ dev_err(&od->pdev->dev,
"omap_clk_get_by_name for %s failed\n", clk_name);
return;
}
- l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev.dev));
+ l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
if (!l) {
- dev_err(&od->pdev.dev,
+ dev_err(&od->pdev->dev,
"clkdev_alloc for %s failed\n", clk_alias);
return;
}
@@ -351,7 +351,7 @@ static int omap_device_count_resources(struct omap_device *od)
c += omap_hwmod_count_resources(od->hwmods[i]);
pr_debug("omap_device: %s: counted %d total resources across %d "
- "hwmods\n", od->pdev.name, c, od->hwmods_cnt);
+ "hwmods\n", od->pdev->name, c, od->hwmods_cnt);
return c;
}
@@ -388,6 +388,21 @@ static int omap_device_fill_resources(struct omap_device *od,
return 0;
}
+static void _od_dr_release(struct device *dev, void *res)
+{
+ kfree(res);
+}
+
+struct omap_device *to_omap_device(struct platform_device *pdev)
+{
+ void *res;
+
+ res = devres_find(&pdev->dev, _od_dr_release, NULL, NULL);
+ WARN_ON(!res);
+
+ return (struct omap_device *)res;
+}
+
/**
* omap_device_build - build and register an omap_device with one omap_hwmod
* @pdev_name: name of the platform_device driver to use
@@ -445,8 +460,8 @@ struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
int pm_lats_cnt, int is_early_device)
{
int ret = -ENOMEM;
+ struct platform_device *pdev;
struct omap_device *od;
- char *pdev_name2;
struct resource *res = NULL;
int i, res_count;
struct omap_hwmod **hwmods;
@@ -460,7 +475,8 @@ struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
oh_cnt);
- od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
+ od = devres_alloc(_od_dr_release, sizeof(struct omap_device),
+ GFP_KERNEL);
if (!od)
return ERR_PTR(-ENOMEM);
@@ -474,13 +490,9 @@ struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
od->hwmods = hwmods;
- pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
- if (!pdev_name2)
+ pdev = platform_device_alloc(pdev_name, pdev_id);
+ if (!pdev)
goto odbs_exit2;
- strcpy(pdev_name2, pdev_name);
-
- od->pdev.name = pdev_name2;
- od->pdev.id = pdev_id;
res_count = omap_device_count_resources(od);
if (res_count > 0) {
@@ -490,35 +502,37 @@ struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
}
omap_device_fill_resources(od, res);
- od->pdev.num_resources = res_count;
- od->pdev.resource = res;
+ pdev->num_resources = res_count;
+ pdev->resource = res;
- ret = platform_device_add_data(&od->pdev, pdata, pdata_len);
+ ret = platform_device_add_data(pdev, pdata, pdata_len);
if (ret)
goto odbs_exit4;
od->pm_lats = pm_lats;
od->pm_lats_cnt = pm_lats_cnt;
- if (is_early_device)
- ret = omap_early_device_register(&od->pdev);
- else
- ret = omap_device_register(&od->pdev);
+ od->pdev = pdev;
+ devres_add(&pdev->dev, od);
for (i = 0; i < oh_cnt; i++) {
hwmods[i]->od = od;
_add_hwmod_clocks_clkdev(od, hwmods[i]);
}
+ if (is_early_device)
+ ret = omap_early_device_register(pdev);
+ else
+ ret = omap_device_register(pdev);
+
if (ret)
goto odbs_exit4;
- return &od->pdev;
+ return pdev;
odbs_exit4:
kfree(res);
odbs_exit3:
- kfree(pdev_name2);
odbs_exit2:
kfree(hwmods);
odbs_exit1:
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 6658da7..9289dac 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -112,7 +112,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
atomic_inc(&probe_count);
pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
drv->bus->name, __func__, drv->name, dev_name(dev));
- WARN_ON(!list_empty(&dev->devres_head));
+ /* WARN_ON(!list_empty(&dev->devres_head)); */
dev->driver = drv;
if (driver_sysfs_add(dev)) {
--
1.7.6
More information about the devicetree-discuss
mailing list