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71a2f11511
Some driver is using this type of DT bindings for clock (more detail,
see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt).
sound_soc {
...
cpu {
clocks = <&xxx>;
...
};
codec {
clocks = <&xxx>;
...
};
};
Current driver in this case uses of_clk_get() for each node, but there
is no devm_of_clk_get() today.
OTOH, the problem of having devm_of_clk_get() is that it encourages the
use of of_clk_get() when clk_get() is more desirable.
Thus, this patch adds new devm_get_clk_from_chile() which explicitly
reads as get a clock from a child node of this device.
By this function, we can also use this type of DT bindings
sound_soc {
clocks = <&xxx>, <&xxx>;
clock-names = "cpu", "codec";
clock-ranges;
...
cpu {
...
};
codec {
...
};
};
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[sboyd@codeurora.org: Rename subject to clk + add API]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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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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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