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https://github.com/AsahiLinux/u-boot
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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
Tom Rini
parent
01114adfc1
commit
139e4a1cbe
2 changed files with 248 additions and 5 deletions
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@ -11,6 +11,7 @@
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#include <reset.h>
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#include <reset-uclass.h>
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#include <dm/devres.h>
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#include <dm/lists.h>
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static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
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{
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@ -100,13 +101,14 @@ int reset_get_by_index_nodev(ofnode node, int index,
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index > 0, reset_ctl);
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}
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int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
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static int __reset_get_bulk(struct udevice *dev, ofnode node,
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struct reset_ctl_bulk *bulk)
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{
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int i, ret, err, count;
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bulk->count = 0;
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count = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
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count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells");
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if (count < 1)
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return count;
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@ -116,7 +118,7 @@ int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
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return -ENOMEM;
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for (i = 0; i < count; i++) {
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ret = reset_get_by_index(dev, i, &bulk->resets[i]);
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ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
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if (ret < 0)
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goto bulk_get_err;
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@ -134,6 +136,11 @@ bulk_get_err:
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return ret;
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}
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int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
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{
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return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
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}
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int reset_get_by_name(struct udevice *dev, const char *name,
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struct reset_ctl *reset_ctl)
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{
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@ -246,6 +253,109 @@ int reset_release_all(struct reset_ctl *reset_ctl, int count)
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return 0;
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}
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static void devm_reset_release(struct udevice *dev, void *res)
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{
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reset_free(res);
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}
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struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
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int index)
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{
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int rc;
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struct reset_ctl *reset_ctl;
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reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
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__GFP_ZERO);
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if (unlikely(!reset_ctl))
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return ERR_PTR(-ENOMEM);
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rc = reset_get_by_index(dev, index, reset_ctl);
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if (rc)
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return ERR_PTR(rc);
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devres_add(dev, reset_ctl);
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return reset_ctl;
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}
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struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
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{
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int rc;
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struct reset_ctl *reset_ctl;
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reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
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__GFP_ZERO);
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if (unlikely(!reset_ctl))
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return ERR_PTR(-ENOMEM);
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rc = reset_get_by_name(dev, id, reset_ctl);
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if (rc)
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return ERR_PTR(rc);
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devres_add(dev, reset_ctl);
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return reset_ctl;
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}
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struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
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const char *id)
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{
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struct reset_ctl *r = devm_reset_control_get(dev, id);
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if (IS_ERR(r))
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return NULL;
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return r;
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}
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static void devm_reset_bulk_release(struct udevice *dev, void *res)
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{
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struct reset_ctl_bulk *bulk = res;
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reset_release_all(bulk->resets, bulk->count);
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}
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struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
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ofnode node)
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{
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int rc;
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struct reset_ctl_bulk *bulk;
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bulk = devres_alloc(devm_reset_bulk_release,
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sizeof(struct reset_ctl_bulk),
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__GFP_ZERO);
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if (unlikely(!bulk))
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return ERR_PTR(-ENOMEM);
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rc = __reset_get_bulk(dev, node, bulk);
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if (rc)
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return ERR_PTR(rc);
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devres_add(dev, bulk);
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return bulk;
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}
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struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
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ofnode node)
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{
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struct reset_ctl_bulk *bulk;
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bulk = devm_reset_bulk_get_by_node(dev, node);
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if (IS_ERR(bulk))
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return NULL;
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return bulk;
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}
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struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
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{
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return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
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}
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struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
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{
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return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
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}
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UCLASS_DRIVER(reset) = {
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.id = UCLASS_RESET,
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.name = "reset",
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135
include/reset.h
135
include/reset.h
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@ -7,7 +7,7 @@
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#define _RESET_H
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#include <dm/ofnode.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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/**
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* A reset is a hardware signal indicating that a HW module (or IP block, or
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@ -84,6 +84,98 @@ struct reset_ctl_bulk {
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};
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#if CONFIG_IS_ENABLED(DM_RESET)
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/**
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* devm_reset_control_get - resource managed reset_get_by_name()
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* @dev: device to be reset by the controller
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* @id: reset line name
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*
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* Managed reset_get_by_name(). For reset controllers returned
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* from this function, reset_free() is called automatically on driver
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* detach.
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*
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* Returns a struct reset_ctl or IS_ERR() condition containing errno.
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*/
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struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id);
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/**
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* devm_reset_control_get_optional - resource managed reset_get_by_name() that
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* can fail
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* @dev: The client device.
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* @id: reset line name
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*
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* Managed reset_get_by_name(). For reset controllers returned
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* from this function, reset_free() is called automatically on driver
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* detach.
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*
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* Returns a struct reset_ctl or a dummy reset controller if it failed.
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*/
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struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
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const char *id);
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/**
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* devm_reset_control_get - resource managed reset_get_by_index()
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* @dev: The client device.
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* @index: The index of the reset signal to request, within the client's
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* list of reset signals.
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*
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* Managed reset_get_by_index(). For reset controllers returned
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* from this function, reset_free() is called automatically on driver
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* detach.
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*
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* Returns a struct reset_ctl or IS_ERR() condition containing errno.
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*/
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struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
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int index);
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/**
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* devm_reset_bulk_get - resource managed reset_get_bulk()
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* @dev: device to be reset by the controller
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*
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* Managed reset_get_bulk(). For reset controllers returned
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* from this function, reset_free() is called automatically on driver
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* detach.
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*
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* Returns a struct reset_ctl or IS_ERR() condition containing errno.
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*/
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struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev);
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/**
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* devm_reset_bulk_get_optional - resource managed reset_get_bulk() that
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* can fail
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* @dev: The client device.
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*
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* Managed reset_get_bulk(). For reset controllers returned
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* from this function, reset_free() is called automatically on driver
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* detach.
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*
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* Returns a struct reset_ctl or NULL if it failed.
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*/
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struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev);
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/**
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* devm_reset_bulk_get_by_node - resource managed reset_get_bulk()
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* @dev: device to be reset by the controller
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* @node: ofnode where the "resets" property is. Usually a sub-node of
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* the dev's node.
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*
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* see devm_reset_bulk_get()
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*/
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struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
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ofnode node);
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/**
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* devm_reset_bulk_get_optional_by_node - resource managed reset_get_bulk()
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* that can fail
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* @dev: device to be reset by the controller
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* @node: ofnode where the "resets" property is. Usually a sub-node of
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* the dev's node.
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*
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* see devm_reset_bulk_get_optional()
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*/
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struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
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ofnode node);
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/**
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* reset_get_by_index - Get/request a reset signal by integer index.
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*
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@ -265,7 +357,48 @@ static inline int reset_release_bulk(struct reset_ctl_bulk *bulk)
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{
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return reset_release_all(bulk->resets, bulk->count);
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}
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#else
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static inline struct reset_ctl *devm_reset_control_get(struct udevice *dev,
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const char *id)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
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const char *id)
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{
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return NULL;
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}
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static inline struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
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int index)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
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{
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return NULL;
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}
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static inline struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
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ofnode node)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
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ofnode node)
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{
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return NULL;
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}
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static inline int reset_get_by_index(struct udevice *dev, int index,
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struct reset_ctl *reset_ctl)
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{
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