clk: ti: add support for TI fixed factor clock

This behaves exactly in similar manner to basic fixed-factor-clock, but
adds a few properties on top for handling clock hardware autoidling.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Tero Kristo 2013-09-13 14:57:59 +03:00 committed by Mike Turquette
parent b4761198bf
commit 1f847c65fd
3 changed files with 111 additions and 1 deletions

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Binding for TI fixed factor rate clock sources.
Binding status: Unstable - ABI compatibility may be broken in the future
This binding uses the common clock binding[1], and also uses the autoidle
support from TI autoidle clock [2].
[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
[2] Documentation/devicetree/bindings/clock/ti/autoidle.txt
Required properties:
- compatible : shall be "ti,fixed-factor-clock".
- #clock-cells : from common clock binding; shall be set to 0.
- ti,clock-div: fixed divider.
- ti,clock-mult: fixed multiplier.
- clocks: parent clock.
Optional properties:
- ti,autoidle-shift: bit shift of the autoidle enable bit for the clock,
see [2]
- reg: offset for the autoidle register of this clock, see [2]
- ti,invert-autoidle-bit: autoidle is enabled by setting the bit to 0, see [2]
- ti,set-rate-parent: clk_set_rate is propagated to parent
Example:
clock {
compatible = "ti,fixed-factor-clock";
clocks = <&parentclk>;
#clock-cells = <0>;
ti,clock-div = <2>;
ti,clock-mult = <1>;
};
dpll_usb_clkdcoldo_ck: dpll_usb_clkdcoldo_ck {
#clock-cells = <0>;
compatible = "ti,fixed-factor-clock";
clocks = <&dpll_usb_ck>;
ti,clock-div = <1>;
ti,autoidle-shift = <8>;
reg = <0x01b4>;
ti,clock-mult = <1>;
ti,invert-autoidle-bit;
};

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ifneq ($(CONFIG_OF),)
obj-y += clk.o autoidle.o
clk-common = dpll.o composite.o divider.o
clk-common = dpll.o composite.o divider.o \
fixed-factor.o
endif

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/*
* TI Fixed Factor Clock
*
* 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/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_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock
* @node: device node for this clock
*
* Sets up a simple fixed factor clock based on device tree info.
*/
static void __init of_ti_fixed_factor_clk_setup(struct device_node *node)
{
struct clk *clk;
const char *clk_name = node->name;
const char *parent_name;
u32 div, mult;
u32 flags = 0;
if (of_property_read_u32(node, "ti,clock-div", &div)) {
pr_err("%s must have a clock-div property\n", node->name);
return;
}
if (of_property_read_u32(node, "ti,clock-mult", &mult)) {
pr_err("%s must have a clock-mult property\n", node->name);
return;
}
if (of_property_read_bool(node, "ti,set-rate-parent"))
flags |= CLK_SET_RATE_PARENT;
parent_name = of_clk_get_parent_name(node, 0);
clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
mult, div);
if (!IS_ERR(clk)) {
of_clk_add_provider(node, of_clk_src_simple_get, clk);
of_ti_clk_autoidle_setup(node);
}
}
CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock",
of_ti_fixed_factor_clk_setup);