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drivers: reset: Add a managed API to get reset controllers from the DT 

Add managed functions to get a reset_ctl from the device-tree, based on a
name or an index.
Also add a managed functions to get a reset_ctl_bulk (array of reset_ctl)
from the device-tree.

When the device is unbound, the reset controllers are automatically
released and the data structure is freed.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2020-09-09 15:37:03 +05:30 committed by Tom Rini
parent 01114adfc1
commit 139e4a1cbe
2 changed files with 248 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
drivers/reset/reset-uclass.c
View File

@ -11,6 +11,7 @@
#include <reset.h>
#include <reset-uclass.h>
#include <dm/devres.h>
#include <dm/lists.h>
static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
{
@ -100,13 +101,14 @@ int reset_get_by_index_nodev(ofnode node, int index,
index > 0, reset_ctl);
}
int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
static int __reset_get_bulk(struct udevice *dev, ofnode node,
struct reset_ctl_bulk *bulk)
{
int i, ret, err, count;
bulk->count = 0;
count = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells");
if (count < 1)
return count;
@ -116,7 +118,7 @@ int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
return -ENOMEM;
for (i = 0; i < count; i++) {
ret = reset_get_by_index(dev, i, &bulk->resets[i]);
ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
if (ret < 0)
goto bulk_get_err;
@ -134,6 +136,11 @@ bulk_get_err:
return ret;
}
int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
{
return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
}
int reset_get_by_name(struct udevice *dev, const char *name,
struct reset_ctl *reset_ctl)
{
@ -246,6 +253,109 @@ int reset_release_all(struct reset_ctl *reset_ctl, int count)
return 0;
}
static void devm_reset_release(struct udevice *dev, void *res)
{
reset_free(res);
}
struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
int index)
{
int rc;
struct reset_ctl *reset_ctl;
reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
__GFP_ZERO);
if (unlikely(!reset_ctl))
return ERR_PTR(-ENOMEM);
rc = reset_get_by_index(dev, index, reset_ctl);
if (rc)
return ERR_PTR(rc);
devres_add(dev, reset_ctl);
return reset_ctl;
}
struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
{
int rc;
struct reset_ctl *reset_ctl;
reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
__GFP_ZERO);
if (unlikely(!reset_ctl))
return ERR_PTR(-ENOMEM);
rc = reset_get_by_name(dev, id, reset_ctl);
if (rc)
return ERR_PTR(rc);
devres_add(dev, reset_ctl);
return reset_ctl;
}
struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
const char *id)
{
struct reset_ctl *r = devm_reset_control_get(dev, id);
if (IS_ERR(r))
return NULL;
return r;
}
static void devm_reset_bulk_release(struct udevice *dev, void *res)
{
struct reset_ctl_bulk *bulk = res;
reset_release_all(bulk->resets, bulk->count);
}
struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
ofnode node)
{
int rc;
struct reset_ctl_bulk *bulk;
bulk = devres_alloc(devm_reset_bulk_release,
sizeof(struct reset_ctl_bulk),
__GFP_ZERO);
if (unlikely(!bulk))
return ERR_PTR(-ENOMEM);
rc = __reset_get_bulk(dev, node, bulk);
if (rc)
return ERR_PTR(rc);
devres_add(dev, bulk);
return bulk;
}
struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
ofnode node)
{
struct reset_ctl_bulk *bulk;
bulk = devm_reset_bulk_get_by_node(dev, node);
if (IS_ERR(bulk))
return NULL;
return bulk;
}
struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
{
return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
}
struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
{
return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
}
UCLASS_DRIVER(reset) = {
.id = UCLASS_RESET,
.name = "reset",

135
include/reset.h
View File

@ -7,7 +7,7 @@
#define _RESET_H
#include <dm/ofnode.h>
#include <linux/errno.h>
#include <linux/err.h>
/**
* A reset is a hardware signal indicating that a HW module (or IP block, or
@ -84,6 +84,98 @@ struct reset_ctl_bulk {
};
#if CONFIG_IS_ENABLED(DM_RESET)
/**
* devm_reset_control_get - resource managed reset_get_by_name()
* @dev: device to be reset by the controller
* @id: reset line name
*
* Managed reset_get_by_name(). For reset controllers returned
* from this function, reset_free() is called automatically on driver
* detach.
*
* Returns a struct reset_ctl or IS_ERR() condition containing errno.
*/
struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id);
/**
* devm_reset_control_get_optional - resource managed reset_get_by_name() that
* can fail
* @dev: The client device.
* @id: reset line name
*
* Managed reset_get_by_name(). For reset controllers returned
* from this function, reset_free() is called automatically on driver
* detach.
*
* Returns a struct reset_ctl or a dummy reset controller if it failed.
*/
struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
const char *id);
/**
* devm_reset_control_get - resource managed reset_get_by_index()
* @dev: The client device.
* @index: The index of the reset signal to request, within the client's
* list of reset signals.
*
* Managed reset_get_by_index(). For reset controllers returned
* from this function, reset_free() is called automatically on driver
* detach.
*
* Returns a struct reset_ctl or IS_ERR() condition containing errno.
*/
struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
int index);
/**
* devm_reset_bulk_get - resource managed reset_get_bulk()
* @dev: device to be reset by the controller
*
* Managed reset_get_bulk(). For reset controllers returned
* from this function, reset_free() is called automatically on driver
* detach.
*
* Returns a struct reset_ctl or IS_ERR() condition containing errno.
*/
struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev);
/**
* devm_reset_bulk_get_optional - resource managed reset_get_bulk() that
* can fail
* @dev: The client device.
*
* Managed reset_get_bulk(). For reset controllers returned
* from this function, reset_free() is called automatically on driver
* detach.
*
* Returns a struct reset_ctl or NULL if it failed.
*/
struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev);
/**
* devm_reset_bulk_get_by_node - resource managed reset_get_bulk()
* @dev: device to be reset by the controller
* @node: ofnode where the "resets" property is. Usually a sub-node of
* the dev's node.
*
* see devm_reset_bulk_get()
*/
struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
ofnode node);
/**
* devm_reset_bulk_get_optional_by_node - resource managed reset_get_bulk()
* that can fail
* @dev: device to be reset by the controller
* @node: ofnode where the "resets" property is. Usually a sub-node of
* the dev's node.
*
* see devm_reset_bulk_get_optional()
*/
struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
ofnode node);
/**
* reset_get_by_index - Get/request a reset signal by integer index.
*
@ -265,7 +357,48 @@ static inline int reset_release_bulk(struct reset_ctl_bulk *bulk)
{
return reset_release_all(bulk->resets, bulk->count);
}
#else
static inline struct reset_ctl *devm_reset_control_get(struct udevice *dev,
const char *id)
{
return ERR_PTR(-ENOTSUPP);
}
static inline struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
const char *id)
{
return NULL;
}
static inline struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
int index)
{
return ERR_PTR(-ENOTSUPP);
}
static inline struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
{
return ERR_PTR(-ENOTSUPP);
}
static inline struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
{
return NULL;
}
static inline struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
ofnode node)
{
return ERR_PTR(-ENOTSUPP);
}
static inline struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
ofnode node)
{
return NULL;
}
static inline int reset_get_by_index(struct udevice *dev, int index,
struct reset_ctl *reset_ctl)
{