Re: [PATCH v7 6/7] clk: hi6220: Clock driver support for Hisilicon hi6220 SoC

[Stephen Boyd]

On 05/22/15 11:57, Brent Wang wrote:
> Hello Stephen,
>
> 2015-05-23 2:41 GMT+08:00 Stephen Boyd <sboyd@xxxxxxxxxxxxxx>:
>> On 05/22, Stephen Boyd wrote:
>>> On 05/22/15 11:30, Brent Wang wrote:
>>>> Hello Stephen,
>>>>
>>>> 2015-05-22 13:20 GMT+08:00 Bintian <bintian.wang@xxxxxxxxxx>:
>>>>>> Is pl011 the uart device? Does it have a node in DT somewhere? If it
>>>>>> does, then we could put the assigned-parents properties in that node so
>>>>>> that when the pl011 probes the uart1 clock has its parent set to
>>>>>> clk_150m. See the "Assigned clock parents and rates" section of
>>>>>> Documentation/devicetree/bindings/clock/clock-bindings.txt.
>>>>>>
>>>>> I will verify this.
>>>> Currently the "assigned-clock*" doesn't work for pl011 UART device
>>>> node, maybe we will
>>>> do some fix for its driver later or other modules.
>>> Why doesn't it work?
>>>
>> Does this patch help?
> Yes, it works!
>
> I also tested adding  "of_clk_set_defaults" to "pl011_probe()", and
> "assigned-clock*"
> also works.
>
> So you will submit another patch to fix this problem and I can revove
> the "clk_set_parent"
> from my patch, right ?
>
>

How about you take it as part of your series? Or if you're planning on
splitting out the clk patch to go through clk-tree I can apply it before
applying the clock driver patch.


----8<-----

From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Subject: [PATCH] amba: Support clk parents and rates assigned in DT

Add the call to of_clk_set_defaults() into the amba probe path so
that devices on the amba bus can use the assigned rates and
parents feature of the common clock framework.

Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
---
 drivers/amba/bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index f0099360039e..350ed93d4281 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -19,6 +19,7 @@
 #include <linux/amba/bus.h>
 #include <linux/sizes.h>
 #include <linux/limits.h>
+#include <linux/clk/clk-conf.h>
 
 #include <asm/irq.h>
 
@@ -237,6 +238,10 @@ static int amba_probe(struct device *dev)
 	int ret;
 
 	do {
+		ret = of_clk_set_defaults(dev->of_node, false);
+		if (ret < 0)
+			break;
+
 		ret = dev_pm_domain_attach(dev, true);
 		if (ret == -EPROBE_DEFER)
 			break;


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