diff options
| -rw-r--r-- | drivers/clk/qcom/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/qcom/clk-dummy.c | 110 | ||||
| -rw-r--r-- | drivers/clk/qcom/common.h | 4 |
3 files changed, 113 insertions, 2 deletions
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile index 94419695cd2e..dc1b66f84af2 100644 --- a/drivers/clk/qcom/Makefile +++ b/drivers/clk/qcom/Makefile @@ -12,6 +12,7 @@ clk-qcom-y += clk-regmap-mux.o clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-krait.o clk-qcom-y += clk-hfpll.o clk-qcom-y += reset.o +clk-qcom-y += clk-dummy.o clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o diff --git a/drivers/clk/qcom/clk-dummy.c b/drivers/clk/qcom/clk-dummy.c new file mode 100644 index 000000000000..3205fbc6b8ba --- /dev/null +++ b/drivers/clk/qcom/clk-dummy.c @@ -0,0 +1,110 @@ +/* + * Copyright (c) 2016, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; 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/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct clk_dummy { + struct clk_hw hw; + unsigned long rrate; +}; + +#define to_clk_dummy(_hw) container_of(_hw, struct clk_dummy, hw) + +static int dummy_clk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_dummy *dummy = to_clk_dummy(hw); + + dummy->rrate = rate; + + pr_debug("set rate: %lu\n", rate); + + return 0; +} + +static long dummy_clk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + return rate; +} + +static unsigned long dummy_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_dummy *dummy = to_clk_dummy(hw); + + pr_debug("clock rate: %lu\n", dummy->rrate); + + return dummy->rrate; +} + +struct clk_ops clk_dummy_ops = { + .set_rate = dummy_clk_set_rate, + .round_rate = dummy_clk_round_rate, + .recalc_rate = dummy_clk_recalc_rate, +}; +EXPORT_SYMBOL_GPL(clk_dummy_ops); + +/** + * clk_register_dummy - register dummy clock with the + * clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @flags: framework-specific flags + */ +static struct clk *clk_register_dummy(struct device *dev, const char *name, + unsigned long flags) +{ + struct clk_dummy *dummy; + struct clk *clk; + struct clk_init_data init = {}; + + /* allocate dummy clock */ + dummy = kzalloc(sizeof(*dummy), GFP_KERNEL); + if (!dummy) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &clk_dummy_ops; + init.flags = flags | CLK_IS_BASIC; + init.num_parents = 0; + dummy->hw.init = &init; + + /* register the clock */ + clk = clk_register(dev, &dummy->hw); + if (IS_ERR(clk)) + kfree(dummy); + + return clk; +} + +/** + * of_dummy_clk_setup() - Setup function for simple fixed rate clock + */ +static void of_dummy_clk_setup(struct device_node *node) +{ + struct clk *clk; + const char *clk_name = "dummy_clk"; + + of_property_read_string(node, "clock-output-names", &clk_name); + + clk = clk_register_dummy(NULL, clk_name, 0); + if (!IS_ERR(clk)) + of_clk_add_provider(node, of_clk_src_simple_get, clk); + + pr_info("%s: Dummy clock registered\n", clk_name); +} +CLK_OF_DECLARE(dummy_clk, "qcom,dummycc", of_dummy_clk_setup); diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h index ae9bdeb21f29..10cabca921be 100644 --- a/drivers/clk/qcom/common.h +++ b/drivers/clk/qcom/common.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * Copyright (c) 2014, 2016, The Linux Foundation. All rights reserved. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and @@ -48,5 +48,5 @@ extern int qcom_cc_really_probe(struct platform_device *pdev, struct regmap *regmap); extern int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc); - +extern struct clk_ops clk_dummy_ops; #endif |