+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
* Copyright (c) 2016, NVIDIA CORPORATION.
* Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm/read.h>
#include <dt-structs.h>
#include <errno.h>
+#include <linux/clk-provider.h>
static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
{
return 0;
}
-static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
- int index, struct clk *clk)
+static int clk_get_by_index_tail(int ret, ofnode node,
+ struct ofnode_phandle_args *args,
+ const char *list_name, int index,
+ struct clk *clk)
{
- int ret;
- struct ofnode_phandle_args args;
struct udevice *dev_clk;
const struct clk_ops *ops;
- debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
-
assert(clk);
clk->dev = NULL;
+ if (ret)
+ goto err;
- ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
- index, &args);
- if (ret) {
- debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
- __func__, ret);
- return ret;
- }
-
- ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
+ ret = uclass_get_device_by_ofnode(UCLASS_CLK, args->node, &dev_clk);
if (ret) {
debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
__func__, ret);
ops = clk_dev_ops(dev_clk);
if (ops->of_xlate)
- ret = ops->of_xlate(clk, &args);
+ ret = ops->of_xlate(clk, args);
else
- ret = clk_of_xlate_default(clk, &args);
+ ret = clk_of_xlate_default(clk, args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
return clk_request(dev_clk, clk);
+err:
+ debug("%s: Node '%s', property '%s', failed to request CLK index %d: %d\n",
+ __func__, ofnode_get_name(node), list_name, index, ret);
+ return ret;
+}
+
+static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
+ int index, struct clk *clk)
+{
+ int ret;
+ struct ofnode_phandle_args args;
+
+ debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
+
+ assert(clk);
+ clk->dev = NULL;
+
+ ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
+ index, &args);
+ if (ret) {
+ debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+
+ return clk_get_by_index_tail(ret, dev_ofnode(dev), &args, "clocks",
+ index > 0, clk);
}
int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
{
- return clk_get_by_indexed_prop(dev, "clocks", index, clk);
+ struct ofnode_phandle_args args;
+ int ret;
+
+ ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
+ index, &args);
+
+ return clk_get_by_index_tail(ret, dev_ofnode(dev), &args, "clocks",
+ index > 0, clk);
+}
+
+int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk)
+{
+ struct ofnode_phandle_args args;
+ int ret;
+
+ ret = ofnode_parse_phandle_with_args(node, "clocks", "#clock-cells", 0,
+ index > 0, &args);
+
+ return clk_get_by_index_tail(ret, node, &args, "clocks",
+ index > 0, clk);
+}
+
+int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
+{
+ int i, ret, err, count;
+
+ bulk->count = 0;
+
+ count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
+ if (count < 1)
+ return count;
+
+ bulk->clks = devm_kcalloc(dev, count, sizeof(struct clk), GFP_KERNEL);
+ if (!bulk->clks)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ ret = clk_get_by_index(dev, i, &bulk->clks[i]);
+ if (ret < 0)
+ goto bulk_get_err;
+
+ ++bulk->count;
+ }
+
+ return 0;
+
+bulk_get_err:
+ err = clk_release_all(bulk->clks, bulk->count);
+ if (err)
+ debug("%s: could release all clocks for %p\n",
+ __func__, dev);
+
+ return ret;
}
static int clk_set_default_parents(struct udevice *dev)
for (index = 0; index < num_parents; index++) {
ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
index, &parent_clk);
+ /* If -ENOENT, this is a no-op entry */
+ if (ret == -ENOENT)
+ continue;
+
if (ret) {
debug("%s: could not get parent clock %d for %s\n",
__func__, index, dev_read_name(dev));
goto fail;
for (index = 0; index < num_rates; index++) {
+ /* If 0 is passed, this is a no-op */
+ if (!rates[index])
+ continue;
+
ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
index, &clk);
if (ret) {
ret = clk_set_rate(&clk, rates[index]);
if (ret < 0) {
- debug("%s: failed to set rate on clock %d for %s\n",
- __func__, index, dev_read_name(dev));
+ debug("%s: failed to set rate on clock index %d (%ld) for %s\n",
+ __func__, index, clk.id, dev_read_name(dev));
break;
}
}
{
int ret;
- /* If this is running pre-reloc state, don't take any action. */
- if (!(gd->flags & GD_FLG_RELOC))
+ /* If this not in SPL and pre-reloc state, don't take any action. */
+ if (!(IS_ENABLED(CONFIG_SPL_BUILD) || (gd->flags & GD_FLG_RELOC)))
return 0;
debug("%s(%s)\n", __func__, dev_read_name(dev));
return ops->get_rate(clk);
}
+struct clk *clk_get_parent(struct clk *clk)
+{
+ struct udevice *pdev;
+ struct clk *pclk;
+
+ debug("%s(clk=%p)\n", __func__, clk);
+
+ pdev = dev_get_parent(clk->dev);
+ pclk = dev_get_clk_ptr(pdev);
+ if (!pclk)
+ return ERR_PTR(-ENODEV);
+
+ return pclk;
+}
+
+long long clk_get_parent_rate(struct clk *clk)
+{
+ const struct clk_ops *ops;
+ struct clk *pclk;
+
+ debug("%s(clk=%p)\n", __func__, clk);
+
+ pclk = clk_get_parent(clk);
+ if (IS_ERR(pclk))
+ return -ENODEV;
+
+ ops = clk_dev_ops(pclk->dev);
+ if (!ops->get_rate)
+ return -ENOSYS;
+
+ /* Read the 'rate' if not already set */
+ if (!pclk->rate)
+ pclk->rate = clk_get_rate(pclk);
+
+ return pclk->rate;
+}
+
ulong clk_set_rate(struct clk *clk, ulong rate)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
return ops->enable(clk);
}
+int clk_enable_bulk(struct clk_bulk *bulk)
+{
+ int i, ret;
+
+ for (i = 0; i < bulk->count; i++) {
+ ret = clk_enable(&bulk->clks[i]);
+ if (ret < 0 && ret != -ENOSYS)
+ return ret;
+ }
+
+ return 0;
+}
+
int clk_disable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
return ops->disable(clk);
}
+int clk_disable_bulk(struct clk_bulk *bulk)
+{
+ int i, ret;
+
+ for (i = 0; i < bulk->count; i++) {
+ ret = clk_disable(&bulk->clks[i]);
+ if (ret < 0 && ret != -ENOSYS)
+ return ret;
+ }
+
+ return 0;
+}
+
UCLASS_DRIVER(clk) = {
.id = UCLASS_CLK,
.name = "clk",
projects / oweals / u-boot.git / blobdiff