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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
At present devices use a simple integer offset to record the device tree node associated with the device. In preparation for supporting a live device tree, which uses a node pointer instead, refactor existing code to access this field through an inline function. Signed-off-by: Simon Glass <sjg@chromium.org>
196 lines
3.7 KiB
C
196 lines
3.7 KiB
C
/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <clk.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <dt-structs.h>
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#include <errno.h>
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DECLARE_GLOBAL_DATA_PTR;
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static inline struct clk_ops *clk_dev_ops(struct udevice *dev)
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{
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return (struct clk_ops *)dev->driver->ops;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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# if CONFIG_IS_ENABLED(OF_PLATDATA)
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int clk_get_by_index_platdata(struct udevice *dev, int index,
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struct phandle_2_cell *cells, struct clk *clk)
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{
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int ret;
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if (index != 0)
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return -ENOSYS;
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ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
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if (ret)
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return ret;
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clk->id = cells[0].id;
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return 0;
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}
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# else
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static int clk_of_xlate_default(struct clk *clk,
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struct fdtdec_phandle_args *args)
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{
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debug("%s(clk=%p)\n", __func__, clk);
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if (args->args_count > 1) {
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debug("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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clk->id = args->args[0];
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else
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clk->id = 0;
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return 0;
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}
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int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
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{
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int ret;
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struct fdtdec_phandle_args args;
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struct udevice *dev_clk;
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struct clk_ops *ops;
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debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
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assert(clk);
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ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
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"clocks", "#clock-cells", 0, index,
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&args);
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if (ret) {
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debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, &dev_clk);
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if (ret) {
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debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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clk->dev = dev_clk;
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ops = clk_dev_ops(dev_clk);
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if (ops->of_xlate)
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ret = ops->of_xlate(clk, &args);
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else
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ret = clk_of_xlate_default(clk, &args);
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if (ret) {
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debug("of_xlate() failed: %d\n", ret);
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return ret;
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}
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return clk_request(dev_clk, clk);
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}
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# endif /* OF_PLATDATA */
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int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
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{
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int index;
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debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
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index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev),
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"clock-names", name);
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if (index < 0) {
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debug("fdt_stringlist_search() failed: %d\n", index);
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return index;
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}
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return clk_get_by_index(dev, index, clk);
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}
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#endif /* OF_CONTROL */
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int clk_request(struct udevice *dev, struct clk *clk)
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{
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struct clk_ops *ops = clk_dev_ops(dev);
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debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
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clk->dev = dev;
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if (!ops->request)
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return 0;
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return ops->request(clk);
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}
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int clk_free(struct clk *clk)
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{
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struct clk_ops *ops = clk_dev_ops(clk->dev);
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debug("%s(clk=%p)\n", __func__, clk);
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if (!ops->free)
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return 0;
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return ops->free(clk);
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}
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ulong clk_get_rate(struct clk *clk)
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{
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struct clk_ops *ops = clk_dev_ops(clk->dev);
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debug("%s(clk=%p)\n", __func__, clk);
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if (!ops->get_rate)
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return -ENOSYS;
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return ops->get_rate(clk);
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}
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ulong clk_set_rate(struct clk *clk, ulong rate)
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{
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struct clk_ops *ops = clk_dev_ops(clk->dev);
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debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
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if (!ops->set_rate)
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return -ENOSYS;
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return ops->set_rate(clk, rate);
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}
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int clk_enable(struct clk *clk)
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{
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struct clk_ops *ops = clk_dev_ops(clk->dev);
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debug("%s(clk=%p)\n", __func__, clk);
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if (!ops->enable)
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return -ENOSYS;
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return ops->enable(clk);
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}
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int clk_disable(struct clk *clk)
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{
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struct clk_ops *ops = clk_dev_ops(clk->dev);
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debug("%s(clk=%p)\n", __func__, clk);
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if (!ops->disable)
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return -ENOSYS;
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return ops->disable(clk);
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}
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UCLASS_DRIVER(clk) = {
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.id = UCLASS_CLK,
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.name = "clk",
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};
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