This commit adds the clk_get_parent_rate() function, which is responsible for getting the rate of parent clock. Unfortunately, u-boot's DM support for getting parent is different (the parent relationship is in udevice) than the one in common clock framework (CCF) in Linux.
To alleviate this problem - the clk_get_parent_rate() function has been introduced to clk-uclass.c.
Signed-off-by: Lukasz Majewski lukma@denx.de
---
Changes in v3: - The rate information is now cached into struct clk field - The clk_get_parent() is used to get pointer to the parent struct clk
drivers/clk/clk-uclass.c | 22 ++++++++++++++++++++++ include/clk.h | 9 +++++++++ 2 files changed, 31 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 7ebe4e79fe..da6624d4f2 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -355,6 +355,28 @@ struct clk *clk_get_parent(struct clk *clk) return pclk; }
+ulong clk_get_parent_rate(struct clk *clk) +{ + const struct clk_ops *ops; + struct clk *pclk; + + debug("%s(clk=%p)\n", __func__, clk); + + pclk = clk_get_parent(clk); + if (IS_ERR(pclk)) + return -ENODEV; + + ops = clk_dev_ops(pclk->dev); + if (!ops->get_rate) + return -ENOSYS; + + /* Read the 'rate' if not already set */ + if (!pclk->rate) + pclk->rate = clk_get_rate(pclk); + + return pclk->rate; +} + ulong clk_set_rate(struct clk *clk, ulong rate) { const struct clk_ops *ops = clk_dev_ops(clk->dev); diff --git a/include/clk.h b/include/clk.h index b44ee3b158..98c3e12fb4 100644 --- a/include/clk.h +++ b/include/clk.h @@ -249,6 +249,15 @@ ulong clk_get_rate(struct clk *clk); struct clk *clk_get_parent(struct clk *clk);
/** + * clk_get_parent_rate() - Get parent of current clock rate. + * + * @clk: A clock struct that was previously successfully requested by + * clk_request/get_by_*(). + * @return clock rate in Hz, or -ve error code. + */ +ulong clk_get_parent_rate(struct clk *clk); + +/** * clk_set_rate() - Set current clock rate. * * @clk: A clock struct that was previously successfully requested by