Hi Jaehoon,
On 2016/3/7 8:53, Jaehoon Chung wrote:
Hi Goudong,
On 03/06/2016 05:47 PM, Guodong Xu wrote:
Add resets property to synopsys-dw-mshc bindings. It is intended to
represent the hardware reset signal present internally in some host
controller IC designs.
See Documentation/devicetree/bindings/reset/reset.txt for details.
Signed-off-by: Guodong Xu <guodong.xu@xxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
index 8636f5a..4e00e85 100644
--- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
+++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
@@ -39,6 +39,10 @@ Required Properties:
Optional properties:
+* resets: phandle + reset specifier pair, intended to represent hardware
+ reset signal present internally in some host controller IC designs.
+ See Documentation/devicetree/bindings/reset/reset.txt for details.
Is this reset property for common dwmmc IP controller?
I think so. By discussion with my ASIC team, it's provided by synopsys.
From dw_mmc databook version 270a, section 3.2.5, FBE Scenarios:
An FBE occurs due to an AHB error response on the AHB bus. This is a
system error, so the software driver should not perform any further
programming to the DWC_mobile_storage. The only recovery mechanism
from such scenarios is to do one of the following:
■ Issue a hard reset by asserting the reset_n signal
■ Do a program controller reset by writing to the CTRL[0] register
the reset_n signal can be used to reset all the internal logic block
with dwmmc and reset the register value to default stat.
Note: reset_n is a internal signal, which is diff from rst_n for mmc hw
reset. (refer to databook section 5.2 Signal Descriptions, table 5-1)
Best Regards,
Jaehoon Chung
+
* clocks: from common clock binding: handle to biu and ciu clocks for the
bus interface unit clock and the card interface unit clock.
--
Best Regards
Shawn Lin
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