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authorMaxime Ripard <maxime.ripard@free-electrons.com>2018-02-21 12:20:25 +0300
committerMark Brown <broonie@kernel.org>2018-02-26 14:05:44 +0300
commit31895662f9ba81e8ea9ef05abf8edcb29d4b9c18 (patch)
tree977da55be387cc63f74a29393193261cb082780c /drivers/base
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
downloadlinux-31895662f9ba81e8ea9ef05abf8edcb29d4b9c18.tar.xz
regmap: mmio: Add function to attach a clock
regmap_init_mmio_clk allows to specify a clock that needs to be enabled while accessing the registers. However, that clock is retrieved through its clock ID, which means it will lookup that clock based on the current device that registers the regmap, and, in the DT case, will only look in that device OF node. This might be problematic if the clock to enable is stored in another node. Let's add a function that allows to attach a clock that has already been retrieved to a regmap in order to fix this. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/regmap/regmap-mmio.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index 5189fd6182f6..5cadfd3394d8 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -28,6 +28,8 @@
struct regmap_mmio_context {
void __iomem *regs;
unsigned val_bytes;
+
+ bool attached_clk;
struct clk *clk;
void (*reg_write)(struct regmap_mmio_context *ctx,
@@ -363,4 +365,26 @@ struct regmap *__devm_regmap_init_mmio_clk(struct device *dev,
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_mmio_clk);
+int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk)
+{
+ struct regmap_mmio_context *ctx = map->bus_context;
+
+ ctx->clk = clk;
+ ctx->attached_clk = true;
+
+ return clk_prepare(ctx->clk);
+}
+EXPORT_SYMBOL_GPL(regmap_mmio_attach_clk);
+
+void regmap_mmio_detach_clk(struct regmap *map)
+{
+ struct regmap_mmio_context *ctx = map->bus_context;
+
+ clk_unprepare(ctx->clk);
+
+ ctx->attached_clk = false;
+ ctx->clk = NULL;
+}
+EXPORT_SYMBOL_GPL(regmap_mmio_detach_clk);
+
MODULE_LICENSE("GPL v2");