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3cd4a59622
Some OMAP clocks require knowledge about their parent clockdomain for book keeping purposes. This patch creates a new DT binding for TI clockdomains, which act as a collection of device clocks. Clockdomain itself is rather misleading name for the hardware functionality, as at least on OMAP4 / OMAP5 / DRA7 the clockdomains can be collections of either clocks and/or IP blocks, thus idle-domain or such might be more appropriate. For most cases on these SoCs, the kernel doesn't even need the information and the mappings can be ignored. Signed-off-by: Tero Kristo <t-kristo@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* OMAP clockdomain support
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*
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* Copyright (C) 2013 Texas Instruments, Inc.
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*
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* Tero Kristo <t-kristo@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/clk/ti.h>
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#undef pr_fmt
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#define pr_fmt(fmt) "%s: " fmt, __func__
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static void __init of_ti_clockdomain_setup(struct device_node *node)
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{
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struct clk *clk;
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struct clk_hw *clk_hw;
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const char *clkdm_name = node->name;
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int i;
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int num_clks;
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num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");
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for (i = 0; i < num_clks; i++) {
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clk = of_clk_get(node, i);
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if (__clk_get_flags(clk) & CLK_IS_BASIC) {
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pr_warn("can't setup clkdm for basic clk %s\n",
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__clk_get_name(clk));
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continue;
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}
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clk_hw = __clk_get_hw(clk);
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to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
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omap2_init_clk_clkdm(clk_hw);
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}
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}
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static struct of_device_id ti_clkdm_match_table[] __initdata = {
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{ .compatible = "ti,clockdomain" },
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{ }
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};
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/**
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* ti_dt_clockdomains_setup - setup device tree clockdomains
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*
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* Initializes clockdomain nodes for a SoC. This parses through all the
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* nodes with compatible = "ti,clockdomain", and add the clockdomain
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* info for all the clocks listed under these. This function shall be
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* called after rest of the DT clock init has completed and all
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* clock nodes have been registered.
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*/
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void __init ti_dt_clockdomains_setup(void)
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{
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struct device_node *np;
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for_each_matching_node(np, ti_clkdm_match_table) {
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of_ti_clockdomain_setup(np);
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}
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}
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