diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/platform.c | 5 | ||||
| -rw-r--r-- | drivers/clk/Makefile | 3 | ||||
| -rw-r--r-- | drivers/clk/clk-conf.c | 143 | ||||
| -rw-r--r-- | drivers/clk/clk.c | 9 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.c | 5 | ||||
| -rw-r--r-- | drivers/spi/spi.c | 6 |
6 files changed, 170 insertions, 1 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 9eda84246ff..7b593d5e694 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -22,6 +22,7 @@ #include <linux/pm_runtime.h> #include <linux/idr.h> #include <linux/acpi.h> +#include <linux/clk/clk-conf.h> #include "base.h" #include "power/power.h" @@ -484,6 +485,10 @@ static int platform_drv_probe(struct device *_dev) struct platform_device *dev = to_platform_device(_dev); int ret; + ret = of_clk_set_defaults(_dev->of_node, false); + if (ret < 0) + return ret; + if (ACPI_HANDLE(_dev)) acpi_dev_pm_attach(_dev, true); diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index bfe0cb6988a..9d805618753 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -8,6 +8,9 @@ obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o obj-$(CONFIG_COMMON_CLK) += clk-gate.o obj-$(CONFIG_COMMON_CLK) += clk-mux.o obj-$(CONFIG_COMMON_CLK) += clk-composite.o +ifeq ($(CONFIG_OF), y) +obj-$(CONFIG_COMMON_CLK) += clk-conf.o +endif # SoCs specific obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o diff --git a/drivers/clk/clk-conf.c b/drivers/clk/clk-conf.c new file mode 100644 index 00000000000..1f73019a27c --- /dev/null +++ b/drivers/clk/clk-conf.c @@ -0,0 +1,143 @@ +/* + * Copyright (C) 2014 Samsung Electronics Co., Ltd. + * Sylwester Nawrocki <s.nawrocki@samsung.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. + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/clk/clk-conf.h> +#include <linux/device.h> +#include <linux/of.h> +#include <linux/printk.h> +#include "clk.h" + +static int __set_clk_parents(struct device_node *node, bool clk_supplier) +{ + struct of_phandle_args clkspec; + int index, rc, num_parents; + struct clk *clk, *pclk; + + num_parents = of_count_phandle_with_args(node, "assigned-clock-parents", + "#clock-cells"); + if (num_parents == -EINVAL) + pr_err("clk: invalid value of clock-parents property at %s\n", + node->full_name); + + for (index = 0; index < num_parents; index++) { + rc = of_parse_phandle_with_args(node, "assigned-clock-parents", + "#clock-cells", index, &clkspec); + if (rc < 0) { + /* skip empty (null) phandles */ + if (rc == -ENOENT) + continue; + else + return rc; + } + if (clkspec.np == node && !clk_supplier) + return 0; + pclk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(pclk)) { + pr_warn("clk: couldn't get parent clock %d for %s\n", + index, node->full_name); + return PTR_ERR(pclk); + } + + rc = of_parse_phandle_with_args(node, "assigned-clocks", + "#clock-cells", index, &clkspec); + if (rc < 0) + goto err; + if (clkspec.np == node && !clk_supplier) { + rc = 0; + goto err; + } + clk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(pclk)) { + pr_warn("clk: couldn't get parent clock %d for %s\n", + index, node->full_name); + rc = PTR_ERR(pclk); + goto err; + } + + rc = clk_set_parent(clk, pclk); + if (rc < 0) + pr_err("clk: failed to reparent %s to %s: %d\n", + __clk_get_name(clk), __clk_get_name(pclk), rc); + clk_put(clk); + clk_put(pclk); + } + return 0; +err: + clk_put(pclk); + return rc; +} + +static int __set_clk_rates(struct device_node *node, bool clk_supplier) +{ + struct of_phandle_args clkspec; + struct property *prop; + const __be32 *cur; + int rc, index = 0; + struct clk *clk; + u32 rate; + + of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) { + if (rate) { + rc = of_parse_phandle_with_args(node, "assigned-clocks", + "#clock-cells", index, &clkspec); + if (rc < 0) { + /* skip empty (null) phandles */ + if (rc == -ENOENT) + continue; + else + return rc; + } + if (clkspec.np == node && !clk_supplier) + return 0; + + clk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(clk)) { + pr_warn("clk: couldn't get clock %d for %s\n", + index, node->full_name); + return PTR_ERR(clk); + } + + rc = clk_set_rate(clk, rate); + if (rc < 0) + pr_err("clk: couldn't set %s clock rate: %d\n", + __clk_get_name(clk), rc); + clk_put(clk); + } + index++; + } + return 0; +} + +/** + * of_clk_set_defaults() - parse and set assigned clocks configuration + * @node: device node to apply clock settings for + * @clk_supplier: true if clocks supplied by @node should also be considered + * + * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties + * and sets any specified clock parents and rates. The @clk_supplier argument + * should be set to true if @node may be also a clock supplier of any clock + * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties. + * If @clk_supplier is false the function exits returnning 0 as soon as it + * determines the @node is also a supplier of any of the clocks. + */ +int of_clk_set_defaults(struct device_node *node, bool clk_supplier) +{ + int rc; + + if (!node) + return 0; + + rc = __set_clk_parents(node, clk_supplier); + if (rc < 0) + return rc; + + return __set_clk_rates(node, clk_supplier); +} diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index ba2f31b1861..2b5b7155bb0 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -10,6 +10,7 @@ */ #include <linux/clk-private.h> +#include <linux/clk/clk-conf.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/spinlock.h> @@ -2191,6 +2192,7 @@ int of_clk_add_provider(struct device_node *np, void *data) { struct of_clk_provider *cp; + int ret; cp = kzalloc(sizeof(struct of_clk_provider), GFP_KERNEL); if (!cp) @@ -2205,7 +2207,11 @@ int of_clk_add_provider(struct device_node *np, mutex_unlock(&of_clk_mutex); pr_debug("Added clock from %s\n", np->full_name); - return 0; + ret = of_clk_set_defaults(np, true); + if (ret < 0) + of_clk_del_provider(np); + + return ret; } EXPORT_SYMBOL_GPL(of_clk_add_provider); @@ -2299,6 +2305,7 @@ void __init of_clk_init(const struct of_device_id *matches) const struct of_device_id *match = of_match_node(matches, np); of_clk_init_cb_t clk_init_cb = match->data; clk_init_cb(np); + of_clk_set_defaults(np, true); } } #endif diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 48e31ed69db..51a0b486aad 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -36,6 +36,7 @@ #include <linux/idr.h> #include <linux/mutex.h> #include <linux/of_device.h> +#include <linux/clk/clk-conf.h> #include <linux/completion.h> #include <linux/hardirq.h> #include <linux/irqflags.h> @@ -248,6 +249,10 @@ static int i2c_device_probe(struct device *dev) client->flags & I2C_CLIENT_WAKE); dev_dbg(dev, "probe\n"); + status = of_clk_set_defaults(dev->of_node, false); + if (status < 0) + return status; + status = driver->probe(client, i2c_match_id(driver->id_table, client)); if (status) { client->driver = NULL; diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 085db8b2f2b..869178714f9 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -27,6 +27,7 @@ #include <linux/mutex.h> #include <linux/of_device.h> #include <linux/of_irq.h> +#include <linux/clk/clk-conf.h> #include <linux/slab.h> #include <linux/mod_devicetable.h> #include <linux/spi/spi.h> @@ -240,6 +241,11 @@ EXPORT_SYMBOL_GPL(spi_bus_type); static int spi_drv_probe(struct device *dev) { const struct spi_driver *sdrv = to_spi_driver(dev->driver); + int ret; + + ret = of_clk_set_defaults(dev->of_node, false); + if (ret) + return ret; return sdrv->probe(to_spi_device(dev)); } |