| /* |
| * Copyright (C) 2014 Samsung Electronics Co., Ltd. |
| * Sylwester Nawrocki <s.nawrocki@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/clk-provider.h> |
| #include <linux/clk/clk-conf.h> |
| #include <linux/device.h> |
| #include <linux/of.h> |
| #include <linux/printk.h> |
| |
| static int __set_clk_parents(struct device_node *node, bool clk_supplier) |
| { |
| struct of_phandle_args clkspec; |
| int index, rc, num_parents; |
| struct clk *clk, *pclk; |
| |
| num_parents = of_count_phandle_with_args(node, "assigned-clock-parents", |
| "#clock-cells"); |
| if (num_parents == -EINVAL) |
| pr_err("clk: invalid value of clock-parents property at %s\n", |
| node->full_name); |
| |
| for (index = 0; index < num_parents; index++) { |
| rc = of_parse_phandle_with_args(node, "assigned-clock-parents", |
| "#clock-cells", index, &clkspec); |
| if (rc < 0) { |
| /* skip empty (null) phandles */ |
| if (rc == -ENOENT) |
| continue; |
| else |
| return rc; |
| } |
| if (clkspec.np == node && !clk_supplier) |
| return 0; |
| pclk = of_clk_get_from_provider(&clkspec); |
| if (IS_ERR(pclk)) { |
| pr_warn("clk: couldn't get parent clock %d for %s\n", |
| index, node->full_name); |
| return PTR_ERR(pclk); |
| } |
| |
| rc = of_parse_phandle_with_args(node, "assigned-clocks", |
| "#clock-cells", index, &clkspec); |
| if (rc < 0) |
| goto err; |
| if (clkspec.np == node && !clk_supplier) { |
| rc = 0; |
| goto err; |
| } |
| clk = of_clk_get_from_provider(&clkspec); |
| if (IS_ERR(clk)) { |
| pr_warn("clk: couldn't get parent clock %d for %s\n", |
| index, node->full_name); |
| rc = PTR_ERR(clk); |
| goto err; |
| } |
| |
| rc = clk_set_parent(clk, pclk); |
| if (rc < 0) |
| pr_err("clk: failed to reparent %s to %s: %d\n", |
| __clk_get_name(clk), __clk_get_name(pclk), rc); |
| clk_put(clk); |
| clk_put(pclk); |
| } |
| return 0; |
| err: |
| clk_put(pclk); |
| return rc; |
| } |
| |
| static int __set_clk_rates(struct device_node *node, bool clk_supplier) |
| { |
| struct of_phandle_args clkspec; |
| struct property *prop; |
| const __be32 *cur; |
| int rc, index = 0; |
| struct clk *clk; |
| u32 rate; |
| |
| of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) { |
| if (rate) { |
| rc = of_parse_phandle_with_args(node, "assigned-clocks", |
| "#clock-cells", index, &clkspec); |
| if (rc < 0) { |
| /* skip empty (null) phandles */ |
| if (rc == -ENOENT) |
| continue; |
| else |
| return rc; |
| } |
| if (clkspec.np == node && !clk_supplier) |
| return 0; |
| |
| clk = of_clk_get_from_provider(&clkspec); |
| if (IS_ERR(clk)) { |
| pr_warn("clk: couldn't get clock %d for %s\n", |
| index, node->full_name); |
| return PTR_ERR(clk); |
| } |
| |
| rc = clk_set_rate(clk, rate); |
| if (rc < 0) |
| pr_err("clk: couldn't set %s clk rate to %d (%d), current rate: %ld\n", |
| __clk_get_name(clk), rate, rc, |
| clk_get_rate(clk)); |
| clk_put(clk); |
| } |
| index++; |
| } |
| return 0; |
| } |
| |
| /** |
| * of_clk_set_defaults() - parse and set assigned clocks configuration |
| * @node: device node to apply clock settings for |
| * @clk_supplier: true if clocks supplied by @node should also be considered |
| * |
| * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties |
| * and sets any specified clock parents and rates. The @clk_supplier argument |
| * should be set to true if @node may be also a clock supplier of any clock |
| * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties. |
| * If @clk_supplier is false the function exits returnning 0 as soon as it |
| * determines the @node is also a supplier of any of the clocks. |
| */ |
| int of_clk_set_defaults(struct device_node *node, bool clk_supplier) |
| { |
| int rc; |
| |
| if (!node) |
| return 0; |
| |
| rc = __set_clk_parents(node, clk_supplier); |
| if (rc < 0) |
| return rc; |
| |
| return __set_clk_rates(node, clk_supplier); |
| } |
| EXPORT_SYMBOL_GPL(of_clk_set_defaults); |