diff options
| -rw-r--r-- | Documentation/devicetree/bindings/clock/ti/fixed-factor-clock.txt | 43 | ||||
| -rw-r--r-- | drivers/clk/ti/Makefile | 3 | ||||
| -rw-r--r-- | drivers/clk/ti/fixed-factor.c | 66 |
3 files changed, 111 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/clock/ti/fixed-factor-clock.txt b/Documentation/devicetree/bindings/clock/ti/fixed-factor-clock.txt new file mode 100644 index 000000000000..662b36d53bf0 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/ti/fixed-factor-clock.txt @@ -0,0 +1,43 @@ +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; + }; diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile index 8690b0b442c0..d3586252a391 100644 --- a/drivers/clk/ti/Makefile +++ b/drivers/clk/ti/Makefile @@ -1,4 +1,5 @@ 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 diff --git a/drivers/clk/ti/fixed-factor.c b/drivers/clk/ti/fixed-factor.c new file mode 100644 index 000000000000..c2c8a287408c --- /dev/null +++ b/drivers/clk/ti/fixed-factor.c @@ -0,0 +1,66 @@ +/* + * 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); |