Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: [PATCH 1/2] Documentation: synopsys-dw-mshc: add binding for resets | From | Shawn Lin <> | Date | Mon, 7 Mar 2016 17:35:53 +0800 |
| |
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@linaro.org> >> Acked-by: Rob Herring <robh@kernel.org> >> --- >> 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
| ![\](/images/icornerr.gif) |