[U-Boot] [PATCH v4 13/13] dm: clk: Extend clk_get_parent_rate() to support CLK_GET_RATE_NOCACHE flag

[Lukasz Majewski]

If the CLK_GET_RATE_NOCACHE flag is set - the clk_get_parent_rate()
provides recalculated clock value without considering the cache setting.

This may be necessary for some clocks tightly coupled with power domains
(i.e. imx8), and prevents from reading invalid cached values.

Signed-off-by: Lukasz Majewski <lukma at denx.de>

---

Changes in v4:
- New patch

Changes in v3: None

 drivers/clk/clk-uclass.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index 6f054396e3..3dcfae85c4 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -13,6 +13,7 @@
 #include <dm/read.h>
 #include <dt-structs.h>
 #include <errno.h>
+#include <linux/clk-provider.h>
 
 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
 {
@@ -409,8 +410,8 @@ ulong clk_get_parent_rate(struct clk *clk)
 	if (!ops->get_rate)
 		return -ENOSYS;
 
-	/* Read the 'rate' if not already set */
-	if (!pclk->rate)
+	/* Read the 'rate' if not already set or if proper flag set*/
+	if (!pclk->rate || pclk->flags & CLK_GET_RATE_NOCACHE)
 		pclk->rate = clk_get_rate(pclk);
 
 	return pclk->rate;
-- 
2.11.0