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@@ -0,0 +1,217 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Texas Instruments System Control Interface (TI SCI) clock driver
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+ *
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+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
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+ * Andreas Dannenberg <dannenberg@ti.com>
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+ *
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+ * Loosely based on Linux kernel sci-clk.c...
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <errno.h>
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+#include <clk-uclass.h>
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+#include <linux/soc/ti/ti_sci_protocol.h>
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+
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+/**
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+ * struct ti_sci_clk_data - clock controller information structure
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+ * @sci: TI SCI handle used for communication with system controller
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+ */
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+struct ti_sci_clk_data {
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+ const struct ti_sci_handle *sci;
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+};
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+
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+static int ti_sci_clk_probe(struct udevice *dev)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(dev);
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+
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+ debug("%s(dev=%p)\n", __func__, dev);
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+
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+ if (!data)
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+ return -ENOMEM;
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+
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+ /* Store handle for communication with the system controller */
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+ data->sci = ti_sci_get_handle(dev);
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+ if (IS_ERR(data->sci))
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+ return PTR_ERR(data->sci);
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+
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+ return 0;
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+}
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+
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+static int ti_sci_clk_of_xlate(struct clk *clk,
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+ struct ofnode_phandle_args *args)
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+{
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+ debug("%s(clk=%p, args_count=%d)\n", __func__, clk, args->args_count);
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+
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+ if (args->args_count != 2) {
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+ debug("Invalid args_count: %d\n", args->args_count);
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+ return -EINVAL;
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+ }
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+
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+ /*
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+ * On TI SCI-based devices, the clock provider id field is used as a
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+ * device ID, and the data field is used as the associated sub-ID.
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+ */
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+ clk->id = args->args[0];
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+ clk->data = args->args[1];
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+
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+ return 0;
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+}
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+
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+static int ti_sci_clk_request(struct clk *clk)
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+{
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+ debug("%s(clk=%p)\n", __func__, clk);
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+ return 0;
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+}
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+
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+static int ti_sci_clk_free(struct clk *clk)
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+{
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+ debug("%s(clk=%p)\n", __func__, clk);
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+ return 0;
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+}
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+
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+static ulong ti_sci_clk_get_rate(struct clk *clk)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
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+ const struct ti_sci_handle *sci = data->sci;
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+ const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
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+ u64 current_freq;
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+ int ret;
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+
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+ debug("%s(clk=%p)\n", __func__, clk);
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+
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+ ret = cops->get_freq(sci, clk->id, clk->data, ¤t_freq);
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+ if (ret) {
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+ dev_err(clk->dev, "%s: get_freq failed (%d)\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ debug("%s(current_freq=%llu)\n", __func__, current_freq);
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+
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+ return current_freq;
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+}
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+
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+static ulong ti_sci_clk_set_rate(struct clk *clk, ulong rate)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
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+ const struct ti_sci_handle *sci = data->sci;
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+ const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
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+ int ret;
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+
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+ debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
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+
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+ /* Ask for exact frequency by using same value for min/target/max */
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+ ret = cops->set_freq(sci, clk->id, clk->data, rate, rate, rate);
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+ if (ret)
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+ dev_err(clk->dev, "%s: set_freq failed (%d)\n", __func__, ret);
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+
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+ return ret;
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+}
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+
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+static int ti_sci_clk_set_parent(struct clk *clk, struct clk *parent)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
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+ const struct ti_sci_handle *sci = data->sci;
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+ const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
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+ u8 num_parents;
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+ u8 parent_cid;
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+ int ret;
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+
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+ debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
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+
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+ /* Make sure the clock parent is valid for a given device ID */
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+ if (clk->id != parent->id)
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+ return -EINVAL;
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+
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+ /* Make sure clock has parents that can be set */
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+ ret = cops->get_num_parents(sci, clk->id, clk->data, &num_parents);
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+ if (ret) {
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+ dev_err(clk->dev, "%s: get_num_parents failed (%d)\n",
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+ __func__, ret);
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+ return ret;
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+ }
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+ if (num_parents < 2) {
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+ dev_err(clk->dev, "%s: clock has no settable parents!\n",
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+ __func__);
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+ return -EINVAL;
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+ }
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+
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+ /* Make sure parent clock ID is valid */
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+ parent_cid = parent->data - clk->data - 1;
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+ if (parent_cid >= num_parents) {
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+ dev_err(clk->dev, "%s: invalid parent clock!\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ /* Ready to proceed to configure the new clock parent */
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+ ret = cops->set_parent(sci, clk->id, clk->data, parent->data);
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+ if (ret)
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+ dev_err(clk->dev, "%s: set_parent failed (%d)\n", __func__,
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+ ret);
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+
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+ return ret;
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+}
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+
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+static int ti_sci_clk_enable(struct clk *clk)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
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+ const struct ti_sci_handle *sci = data->sci;
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+ const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
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+ int ret;
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+
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+ debug("%s(clk=%p)\n", __func__, clk);
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+
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+ /*
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+ * Allow the System Controller to automatically manage the state of
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+ * this clock. If the device is enabled, then the clock is enabled.
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+ */
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+ ret = cops->put_clock(sci, clk->id, clk->data);
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+ if (ret)
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+ dev_err(clk->dev, "%s: put_clock failed (%d)\n", __func__, ret);
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+
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+ return ret;
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+}
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+
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+static int ti_sci_clk_disable(struct clk *clk)
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+{
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+ struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
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+ const struct ti_sci_handle *sci = data->sci;
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+ const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
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+ int ret;
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+
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+ debug("%s(clk=%p)\n", __func__, clk);
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+
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+ /* Unconditionally disable clock, regardless of state of the device */
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+ ret = cops->idle_clock(sci, clk->id, clk->data);
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+ if (ret)
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+ dev_err(clk->dev, "%s: idle_clock failed (%d)\n", __func__,
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+ ret);
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+
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+ return ret;
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+}
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+
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+static const struct udevice_id ti_sci_clk_of_match[] = {
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+ { .compatible = "ti,k2g-sci-clk" },
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+ { /* sentinel */ },
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+};
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+
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+static struct clk_ops ti_sci_clk_ops = {
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+ .of_xlate = ti_sci_clk_of_xlate,
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+ .request = ti_sci_clk_request,
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+ .free = ti_sci_clk_free,
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+ .get_rate = ti_sci_clk_get_rate,
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+ .set_rate = ti_sci_clk_set_rate,
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+ .set_parent = ti_sci_clk_set_parent,
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+ .enable = ti_sci_clk_enable,
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+ .disable = ti_sci_clk_disable,
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+};
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+
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+U_BOOT_DRIVER(ti_sci_clk) = {
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+ .name = "ti-sci-clk",
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+ .id = UCLASS_CLK,
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+ .of_match = ti_sci_clk_of_match,
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+ .probe = ti_sci_clk_probe,
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+ .priv_auto_alloc_size = sizeof(struct ti_sci_clk_data),
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+ .ops = &ti_sci_clk_ops,
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+};
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