On 10/27/2015 10:39 PM, Mark Rutland wrote:
On Tue, Oct 27, 2015 at 01:09:15PM +0000, John Garry wrote:
On 26/10/2015 14:45, Mark Rutland wrote:
On Mon, Oct 26, 2015 at 10:14:33PM +0800, John Garry wrote:
Add devicetree bindings for HiSilicon SAS driver.
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
.../devicetree/bindings/scsi/hisilicon-sas.txt | 70 ++++++++++++++++++++++
1 file changed, 70 insertions(+)
create mode 100644 Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
diff --git a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
new file mode 100644
index 0000000..d1e7b2a
--- /dev/null
+++ b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
@@ -0,0 +1,70 @@
+* HiSilicon SAS controller
+
+The HiSilicon SAS controller supports SAS/SATA.
+
+Main node required properties:
+ - compatible : value should be as follows:
+ (a) "hisilicon,sas-controller-v1" for v1 of HiSilicon SAS controller IP
+ - reg : Address and length of the SAS register
+ - hisilicon,sas-syscon: phandle of syscon used for sas control
+ - ctrl-reg : offset to the following SAS control registers (in order):
+ - reset assert
+ - clock disable
+ - reset status
+ - reset de-assert
+ - clock enable
This needs a better name, and it should probably be split up into
several properties.
However, it sounds like the syscon is actually a clock+reset
controller, and should be modelled as such. It's not actually a part of
the SAS controller as such.
The syscon block is a general subsystem control block, and it is not
specifically only for controlling reset and enabling clocks (other
functions include serdes control, for example). It is also shared
with other peripherals.
So we can remove the ctrl-reg property (since it is not part of the
SAS controller), and add the relevant syscon register offsets to the
"hisilicon,sas-syscon" property, like this:
hisilicon,sas-syscon = <&sas_ctrl0 0xa60 0x33c 0x5a30 0xa64 0x338>;
Ok?
It would be better to have each offset in a separate property.
These register are not used for different purpose.
Instead, they are all used for one purpose, reset the sas controller;
Though a bit complicated, the silicon has special requirement here.
So still prefer using the original method,
ctrl-reg = <0xa60 0x33c 0x5a30 0xa64 0x338>;
Since we can simply use of_property_read_u32_array.
Thanks
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