forked from luck/tmp_suning_uos_patched
60b8f0ddf1
This adds clk_get_optional() and devm_clk_get_optional() functions to get optional clocks. They behave the same as (devm_)clk_get() except where there is no clock producer. In this case, instead of returning -ENOENT, the function returns NULL. This makes error checking simpler and allows clk_prepare_enable, etc to be called on the returned reference without additional checks. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Russell King <linux@armlinux.org.uk> [sboyd@kernel.org: Document in devres.txt] Signed-off-by: Stephen Boyd <sboyd@kernel.org>
143 lines
2.7 KiB
C
143 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/gfp.h>
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static void devm_clk_release(struct device *dev, void *res)
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{
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clk_put(*(struct clk **)res);
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}
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struct clk *devm_clk_get(struct device *dev, const char *id)
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{
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struct clk **ptr, *clk;
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ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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clk = clk_get(dev, id);
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if (!IS_ERR(clk)) {
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*ptr = clk;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return clk;
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}
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EXPORT_SYMBOL(devm_clk_get);
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struct clk *devm_clk_get_optional(struct device *dev, const char *id)
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{
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struct clk *clk = devm_clk_get(dev, id);
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if (clk == ERR_PTR(-ENOENT))
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return NULL;
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return clk;
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}
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EXPORT_SYMBOL(devm_clk_get_optional);
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struct clk_bulk_devres {
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struct clk_bulk_data *clks;
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int num_clks;
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};
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static void devm_clk_bulk_release(struct device *dev, void *res)
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{
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struct clk_bulk_devres *devres = res;
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clk_bulk_put(devres->num_clks, devres->clks);
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}
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int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
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struct clk_bulk_data *clks)
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{
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struct clk_bulk_devres *devres;
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int ret;
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devres = devres_alloc(devm_clk_bulk_release,
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sizeof(*devres), GFP_KERNEL);
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if (!devres)
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return -ENOMEM;
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ret = clk_bulk_get(dev, num_clks, clks);
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if (!ret) {
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devres->clks = clks;
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devres->num_clks = num_clks;
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devres_add(dev, devres);
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} else {
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devres_free(devres);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
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int __must_check devm_clk_bulk_get_all(struct device *dev,
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struct clk_bulk_data **clks)
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{
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struct clk_bulk_devres *devres;
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int ret;
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devres = devres_alloc(devm_clk_bulk_release,
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sizeof(*devres), GFP_KERNEL);
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if (!devres)
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return -ENOMEM;
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ret = clk_bulk_get_all(dev, &devres->clks);
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if (ret > 0) {
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*clks = devres->clks;
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devres->num_clks = ret;
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devres_add(dev, devres);
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} else {
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devres_free(devres);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
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static int devm_clk_match(struct device *dev, void *res, void *data)
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{
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struct clk **c = res;
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if (!c || !*c) {
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WARN_ON(!c || !*c);
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return 0;
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}
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return *c == data;
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}
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void devm_clk_put(struct device *dev, struct clk *clk)
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{
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int ret;
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ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
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WARN_ON(ret);
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}
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EXPORT_SYMBOL(devm_clk_put);
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struct clk *devm_get_clk_from_child(struct device *dev,
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struct device_node *np, const char *con_id)
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{
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struct clk **ptr, *clk;
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ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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clk = of_clk_get_by_name(np, con_id);
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if (!IS_ERR(clk)) {
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*ptr = clk;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return clk;
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}
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EXPORT_SYMBOL(devm_get_clk_from_child);
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