[PATCH v2 3/5] clk: dt: binding for basic multiplexer clock
Mike Turquette
mturquette at linaro.org
Sun Jun 16 22:58:23 EDT 2013
Device Tree binding for the basic clock multiplexer, plus the setup
function to register the clock. Based on the existing fixed-clock
binding.
Includes minor beautification of clk-provider.h where some whitespace is
added and of_fixed_factor_clock_setup is relocated to maintain a
consistent style.
Signed-off-by: Mike Turquette <mturquette at linaro.org>
---
Changes since v1:
* pass shift value into clk_register_mux_table
* s/multiplexor/multiplexer/
* removed debug prints
* mask is u32, shift is u8
* DT property names use dashes instead of underscores
* DT property names are more verbose
* shift property is optional in binding and can be auto-generated from a
full 32-bit mask
.../devicetree/bindings/clock/mux-clock.txt | 77 ++++++++++++++++++++++
drivers/clk/clk-mux.c | 62 ++++++++++++++++-
include/linux/clk-provider.h | 5 +-
3 files changed, 142 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/mux-clock.txt
diff --git a/Documentation/devicetree/bindings/clock/mux-clock.txt b/Documentation/devicetree/bindings/clock/mux-clock.txt
new file mode 100644
index 0000000..8fa370e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/mux-clock.txt
@@ -0,0 +1,77 @@
+Binding for simple mux clock.
+
+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_one" modified the scheme as follows:
+
+register value selected clock parent
+1 foo_clock
+2 bar_clock
+3 baz_clock
+
+Additionally an optional table of bit and parent pairs may be supplied
+like so:
+
+ table = <&foo_clock 0x0>, <&bar_clock, 0x2>, <&baz_clock, 0x4>;
+
+where the first value in the pair is the parent clock and the second
+value is the bitfield to be programmed into the register.
+
+The binding must provide the register to control the mux and the mask
+for the corresponding control bits. Optionally the number of bits to
+shift that mask if necessary. 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 "mux-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : link phandles of parent clocks
+- reg : base address for register controlling adjustable mux
+- bit-mask : arbitrary bitmask for programming the adjustable mux
+
+Optional properties:
+- clock-output-names : From common clock binding.
+- table : array of integer pairs defining parents & bitfield values
+- bit-shift : number of bits to shift the bit-mask, defaults to
+ (ffs(mask) - 1) if not present
+- index-starts-at-one : valid input select programming starts at 1, not
+ zero
+
+Examples:
+ clock: clock at 4a008100 {
+ compatible = "mux-clock";
+ #clock-cells = <0>;
+ clocks = <&clock_foo>, <&clock_bar>, <&clock_baz>;
+ reg = <0x4a008100 0x4>
+ mask = <0x3>;
+ index_one;
+ };
+
+ clock: clock at 4a008100 {
+ #clock-cells = <0>;
+ compatible = "mux-clock";
+ clocks = <&clock_foo>, <&clock_bar>, <&clock_baz>;
+ reg = <0x4a008100 0x4>;
+ mask = <0x3>;
+ shift = <0>;
+ table = <&clock_foo 1>, <&clock_bar 2>, <&clock_baz 3>;
+ };
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index 614444c..a640228 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -1,7 +1,7 @@
/*
* Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer at pengutronix.de>
* Copyright (C) 2011 Richard Zhao, Linaro <richard.zhao at linaro.org>
- * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette at linaro.org>
+ * Copyright (C) 2011-2013 Mike Turquette, Linaro Ltd <mturquette at linaro.org>
*
* 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
@@ -16,6 +16,8 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
/*
* DOC: basic adjustable multiplexer clock that cannot gate
@@ -166,3 +168,61 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
flags, reg, shift, mask, clk_mux_flags,
NULL, lock);
}
+
+#ifdef CONFIG_OF
+/**
+ * of_mux_clk_setup() - Setup function for simple mux rate clock
+ */
+void of_mux_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ const char *clk_name = node->name;
+ void __iomem *reg;
+ int num_parents;
+ const char **parent_names;
+ int i;
+ u8 clk_mux_flags = 0;
+ u32 mask = 0;
+ u8 shift = 0;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ num_parents = of_clk_get_parent_count(node);
+ if (num_parents < 1) {
+ pr_err("%s: mux-clock %s must have parent(s)\n",
+ __func__, node->name);
+ return;
+ }
+
+ parent_names = kzalloc((sizeof(char*) * num_parents),
+ GFP_KERNEL);
+
+ for (i = 0; i < num_parents; i++)
+ parent_names[i] = of_clk_get_parent_name(node, i);
+
+ reg = of_iomap(node, 0);
+
+ if (of_property_read_u32(node, "bit-mask", &mask)) {
+ pr_err("%s: missing bit-mask property for %s\n", __func__, node->name);
+ return;
+ }
+
+ if (of_property_read_u8(node, "bit-shift", &shift)) {
+ shift = __ffs(mask);
+ pr_debug("%s: bit-shift property defaults to 0x%x for %s\n",
+ __func__, shift, node->name);
+ }
+
+ if (of_property_read_bool(node, "index-starts-at-one"))
+ clk_mux_flags |= CLK_MUX_INDEX_ONE;
+
+ clk = clk_register_mux_table(NULL, clk_name, parent_names, num_parents,
+ 0, reg, shift, mask, clk_mux_flags,
+ NULL, NULL);
+
+ if (!IS_ERR(clk))
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+}
+EXPORT_SYMBOL_GPL(of_mux_clk_setup);
+CLK_OF_DECLARE(mux_clk, "mux-clock", of_mux_clk_setup);
+#endif
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 8730cb9..24a04b8 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -340,7 +340,7 @@ struct clk *clk_register_mux_table(struct device *dev, const char *name,
void __iomem *reg, u8 shift, u32 mask,
u8 clk_mux_flags, u32 *table, spinlock_t *lock);
-void of_fixed_factor_clk_setup(struct device_node *node);
+void of_mux_clk_setup(struct device_node *node);
/**
* struct clk_fixed_factor - fixed multiplier and divider clock
@@ -361,10 +361,13 @@ struct clk_fixed_factor {
};
extern struct clk_ops clk_fixed_factor_ops;
+
struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
unsigned int mult, unsigned int div);
+void of_fixed_factor_clk_setup(struct device_node *node);
+
/***
* struct clk_composite - aggregate clock of mux, divider and gate clocks
*
--
1.8.1.2
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