[PATCHv10 11/41] clk: ti: add support for basic mux clock
Tero Kristo
t-kristo at ti.com
Tue Nov 26 03:05:52 EST 2013
ti,mux-clock provides now a binding for basic mux support. This is just
using the basic clock type.
Signed-off-by: Tero Kristo <t-kristo at ti.com>
---
Documentation/devicetree/bindings/clock/ti/mux.txt | 76 +++++++++++
drivers/clk/ti/Makefile | 2 +-
drivers/clk/ti/mux.c | 141 ++++++++++++++++++++
3 files changed, 218 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/clock/ti/mux.txt
create mode 100644 drivers/clk/ti/mux.c
diff --git a/Documentation/devicetree/bindings/clock/ti/mux.txt b/Documentation/devicetree/bindings/clock/ti/mux.txt
new file mode 100644
index 0000000..2d0d170
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti/mux.txt
@@ -0,0 +1,76 @@
+Binding for TI mux clock.
+
+Binding status: Unstable - ABI compatibility may be broken in the future
+
+This binding uses the common clock binding[1]. It assumes a
+register-mapped multiplexer with multiple input clock signals or
+parents, one of which can be selected as output. This clock does not
+gate or adjust the parent rate via a divider or multiplier.
+
+By default the "clocks" property lists the parents in the same order
+as they are programmed into the regster. E.g:
+
+ clocks = <&foo_clock>, <&bar_clock>, <&baz_clock>;
+
+results in programming the register as follows:
+
+register value selected parent clock
+0 foo_clock
+1 bar_clock
+2 baz_clock
+
+Some clock controller IPs do not allow a value of zero to be programmed
+into the register, instead indexing begins at 1. The optional property
+"index-starts-at-one" modified the scheme as follows:
+
+register value selected clock parent
+1 foo_clock
+2 bar_clock
+3 baz_clock
+
+The binding must provide the register to control the mux. Optionally
+the number of bits to shift the control field in the register can be
+supplied. If the shift value is missing it is the same as supplying
+a zero shift.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : shall be "ti,mux-clock" or "ti,composite-mux-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : link phandles of parent clocks
+- reg : register offset for register controlling adjustable mux
+
+Optional properties:
+- ti,bit-shift : number of bits to shift the bit-mask, defaults to
+ 0 if not present
+- ti,index-starts-at-one : valid input select programming starts at 1, not
+ zero
+- ti,set-rate-parent : clk_set_rate is propagated to parent clock,
+ not supported by the composite-mux-clock subtype
+
+Examples:
+
+sys_clkin_ck: sys_clkin_ck at 4a306110 {
+ #clock-cells = <0>;
+ compatible = "ti,mux-clock";
+ clocks = <&virt_12000000_ck>, <&virt_13000000_ck>, <&virt_16800000_ck>, <&virt_19200000_ck>, <&virt_26000000_ck>, <&virt_27000000_ck>, <&virt_38400000_ck>;
+ reg = <0x0110>;
+ ti,index-starts-at-one;
+};
+
+abe_dpll_bypass_clk_mux_ck: abe_dpll_bypass_clk_mux_ck at 4a306108 {
+ #clock-cells = <0>;
+ compatible = "ti,mux-clock";
+ clocks = <&sys_clkin_ck>, <&sys_32k_ck>;
+ ti,bit-shift = <24>;
+ reg = <0x0108>;
+};
+
+mcbsp5_mux_fck: mcbsp5_mux_fck {
+ #clock-cells = <0>;
+ compatible = "ti,composite-mux-clock";
+ clocks = <&core_96m_fck>, <&mcbsp_clks>;
+ ti,bit-shift = <4>;
+ reg = <0x02d8>;
+};
diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
index 67056fb..ef61d39 100644
--- a/drivers/clk/ti/Makefile
+++ b/drivers/clk/ti/Makefile
@@ -1,5 +1,5 @@
ifneq ($(CONFIG_OF),)
obj-y += clk.o dpll.o autoidle.o divider.o \
fixed-factor.o gate.o clockdomain.o \
- composite.o
+ composite.o mux.o
endif
diff --git a/drivers/clk/ti/mux.c b/drivers/clk/ti/mux.c
new file mode 100644
index 0000000..b0aac6a
--- /dev/null
+++ b/drivers/clk/ti/mux.c
@@ -0,0 +1,141 @@
+/*
+ * TI Multiplexer Clock
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo at 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/err.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__
+
+/**
+ * of_mux_clk_setup - Setup function for simple mux rate clock
+ * @node: DT node for the clock
+ *
+ * Sets up a basic clock multiplexer.
+ */
+static int of_mux_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ void __iomem *reg;
+ int num_parents;
+ const char **parent_names;
+ int i;
+ u8 clk_mux_flags = 0;
+ u32 mask = 0;
+ u32 shift = 0;
+ u32 flags = 0;
+ int ret;
+
+ num_parents = of_clk_get_parent_count(node);
+ if (num_parents < 2) {
+ pr_err("mux-clock %s must have parents\n", node->name);
+ return -EINVAL;
+ }
+ parent_names = kzalloc((sizeof(char *) * num_parents), GFP_KERNEL);
+ if (!parent_names)
+ return -ENOMEM;
+
+ for (i = 0; i < num_parents; i++)
+ parent_names[i] = of_clk_get_parent_name(node, i);
+
+ reg = ti_clk_get_reg_addr(node, 0);
+
+ if (!reg) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ of_property_read_u32(node, "ti,bit-shift", &shift);
+
+ if (of_property_read_bool(node, "ti,index-starts-at-one"))
+ clk_mux_flags |= CLK_MUX_INDEX_ONE;
+
+ if (of_property_read_bool(node, "ti,set-rate-parent"))
+ flags |= CLK_SET_RATE_PARENT;
+
+ /* Generate bit-mask based on parent info */
+ mask = num_parents;
+ if (!(clk_mux_flags & CLK_MUX_INDEX_ONE))
+ mask--;
+
+ mask = (1 << fls(mask)) - 1;
+
+ clk = clk_register_mux_table(NULL, node->name, parent_names,
+ num_parents, flags, reg, shift, mask,
+ clk_mux_flags, NULL, NULL);
+
+ if (!IS_ERR(clk)) {
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ return 0;
+ }
+ ret = PTR_ERR(clk);
+
+cleanup:
+ kfree(parent_names);
+ return ret;
+}
+CLK_OF_DECLARE(mux_clk, "ti,mux-clock", of_mux_clk_setup);
+
+static int __init of_ti_composite_mux_clk_setup(struct device_node *node)
+{
+ struct clk_mux *mux;
+ int num_parents;
+ int ret;
+ u32 val;
+
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return -ENOMEM;
+
+ mux->reg = ti_clk_get_reg_addr(node, 0);
+
+ if (!mux->reg) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ if (!of_property_read_u32(node, "ti,bit-shift", &val))
+ mux->shift = val;
+
+ if (of_property_read_bool(node, "ti,index-starts-at-one"))
+ mux->flags |= CLK_MUX_INDEX_ONE;
+
+ num_parents = of_clk_get_parent_count(node);
+
+ if (num_parents < 2) {
+ pr_err("%s must have parents\n", node->name);
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ mux->mask = num_parents - 1;
+ mux->mask = (1 << fls(mux->mask)) - 1;
+
+ ret = ti_clk_add_component(node, &mux->hw, CLK_COMPONENT_TYPE_MUX);
+ if (!ret)
+ return 0;
+
+cleanup:
+ kfree(mux);
+ return ret;
+}
+CLK_OF_DECLARE(ti_composite_mux_clk_setup, "ti,composite-mux-clock",
+ of_ti_composite_mux_clk_setup);
--
1.7.9.5
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