From: Patrice Chotard patrice.chotard@st.com
Add clk_release_all() method which Disable/Free an array of clocks that has been previously requested by clk_request/get_by_*()
Signed-off-by: Patrice Chotard patrice.chotard@st.com --- v9: _ to avoid confusion, rename clk_disable_all() in clk_release_all() as this function not only disable all clocks but also free all of them _ add a check in clk_release_all() to verify if a clock has been previously requested before asserting and freeing it. v8: _ replace clk->dev by clk[i].dev in clk_request() param v7: _ none v6: _ none v5: _ none v4: _ none v3: _ add commit message v2: _ create this independant path for printf() replacement
drivers/clk/clk-uclass.c | 26 ++++++++++++++++++++++++++ include/clk.h | 14 ++++++++++++++ 2 files changed, 40 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 83b6328..ffbe872 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -65,6 +65,8 @@ int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
assert(clk); + clk->dev = NULL; + ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0, index, &args); if (ret) { @@ -102,6 +104,7 @@ int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) int index;
debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); + clk->dev = NULL;
index = dev_read_stringlist_search(dev, "clock-names", name); if (index < 0) { @@ -187,6 +190,29 @@ int clk_disable(struct clk *clk) return ops->disable(clk); }
+int clk_release_all(struct clk *clk, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]); + + /* check if clock has been previously requested */ + if (!clk[i].dev) + continue; + + ret = clk_disable(&clk[i]); + if (ret && ret != -ENOSYS) + return ret; + + ret = clk_free(&clk[i]); + if (ret && ret != -ENOSYS) + return ret; + } + + return 0; +} + UCLASS_DRIVER(clk) = { .id = UCLASS_CLK, .name = "clk", diff --git a/include/clk.h b/include/clk.h index 5a5c2ff..a905a41 100644 --- a/include/clk.h +++ b/include/clk.h @@ -174,6 +174,20 @@ int clk_enable(struct clk *clk); */ int clk_disable(struct clk *clk);
+/** + * clk_release_all() - Disable (turn off)/Free an array of previously + * requested clocks. + * + * For each clock contained in the clock array, this function will check if + * clock has been previously requested and then will disable and free it. + * + * @clk: A clock struct array that was previously successfully + * requested by clk_request/get_by_*(). + * @count Number of clock contained in the array + * @return zero on success, or -ve error code. + */ +int clk_release_all(struct clk *clk, int count); + int soc_clk_dump(void);
#endif