CLK: TI: add support for clockdomain binding
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>
diff --git a/drivers/clk/ti/clockdomain.c b/drivers/clk/ti/clockdomain.c
new file mode 100644
index 0000000..f1e0038
--- /dev/null
+++ b/drivers/clk/ti/clockdomain.c
@@ -0,0 +1,70 @@
+/*
+ * OMAP clockdomain support
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo@ti.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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+static void __init of_ti_clockdomain_setup(struct device_node *node)
+{
+ struct clk *clk;
+ struct clk_hw *clk_hw;
+ const char *clkdm_name = node->name;
+ int i;
+ int num_clks;
+
+ num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");
+
+ for (i = 0; i < num_clks; i++) {
+ clk = of_clk_get(node, i);
+ if (__clk_get_flags(clk) & CLK_IS_BASIC) {
+ pr_warn("can't setup clkdm for basic clk %s\n",
+ __clk_get_name(clk));
+ continue;
+ }
+ clk_hw = __clk_get_hw(clk);
+ to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
+ omap2_init_clk_clkdm(clk_hw);
+ }
+}
+
+static struct of_device_id ti_clkdm_match_table[] __initdata = {
+ { .compatible = "ti,clockdomain" },
+ { }
+};
+
+/**
+ * ti_dt_clockdomains_setup - setup device tree clockdomains
+ *
+ * Initializes clockdomain nodes for a SoC. This parses through all the
+ * nodes with compatible = "ti,clockdomain", and add the clockdomain
+ * info for all the clocks listed under these. This function shall be
+ * called after rest of the DT clock init has completed and all
+ * clock nodes have been registered.
+ */
+void __init ti_dt_clockdomains_setup(void)
+{
+ struct device_node *np;
+ for_each_matching_node(np, ti_clkdm_match_table) {
+ of_ti_clockdomain_setup(np);
+ }
+}