[PATCH v2 1/2] ARM: dts: socfpga: Add fpga2hps and fpga2sdram bridges

Steffen Trumtrar s.trumtrar at pengutronix.de
Thu Sep 13 22:45:37 PDT 2018


Hi!

Alan Tull <atull at kernel.org> writes:

> On Thu, Sep 13, 2018 at 2:27 AM Steffen Trumtrar
> <s.trumtrar at pengutronix.de> wrote:
>>
>>
>> Hi!
>>
>> Steffen Trumtrar <s.trumtrar at pengutronix.de> writes:
>>
>> > Add the remaining two bridges on the Cyclone-V SoCFPGA SoCs.
>> >
>> > Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
>> > ---
>> > Changes in v2:
>> >   - set status to disabled, so there are no accidental users 
>> >   of
>> >   the bridges
>> >
>> >  arch/arm/boot/dts/socfpga.dtsi | 14 ++++++++++++++
>> >  1 file changed, 14 insertions(+)
>> >
>> > diff --git a/arch/arm/boot/dts/socfpga.dtsi
>> > b/arch/arm/boot/dts/socfpga.dtsi
>> > index b38f8c240558..11781f795de2 100644
>> > --- a/arch/arm/boot/dts/socfpga.dtsi
>> > +++ b/arch/arm/boot/dts/socfpga.dtsi
>> > @@ -543,6 +543,20 @@
>> >                       clocks = <&l4_main_clk>;
>> >               };
>> >
>> > +             fpga_bridge2: fpga-bridge at ff600000 {
>> > +                     compatible =
>> > "altr,socfpga-fpga2hps-bridge";
>> > +                     reg = <0xff600000 0x100000>;
>> > +                     resets = <&rst FPGA2HPS_RESET>;
>> > +                     clocks = <&l4_main_clk>;
>> > +                     status = "disabled";
>> > +             };
>> > +
>> > +             fpga_bridge3: fpga-bridge at ffc25080 {
>> > +                     compatible =
>> > "altr,socfpga-fpga2sdram-bridge";
>> > +                     reg = <0xffc25080 0x4>;
>> > +                     status = "disabled";
>> > +             };
>> > +
>> >               fpgamgr0: fpgamgr at ff706000 {
>> >                       compatible = "altr,socfpga-fpga-mgr";
>> >                       reg = <0xff706000 0x1000
>>
>> Any opinion on this? There shouldn't be any accidental use of 
>> the
>> bridges now with status=disabled.
>
> Hi Steffen,
>
> Do you have a use case you need this for?
>

Yes, of course. I think all our SoCFPGA customers use these 
bridges.

> I don't mind leaving it that way it is and letting people who 
> are
> actually enabling the bridges in their designs add the whole 
> node.
>

Why do you think, that these bridges are different from the other 
ones?
Or other IP blocks on the SoCFPGA even?
This is the socfpga.dtsi file, it describes the hardware common to 
all
Cyclone5 SoCs. All SoCs have these bridges, so why not add it?


Best regards,
Steffen

-- 
Pengutronix e.K.                          | Steffen Trumtrar 
|
Industrial Linux Solutions                | 
http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany| Phone: 
+49-5121-206917-0   |
Amtsgericht Hildesheim, HRA 2686          | Fax: 
+49-5121-206917-5555|



More information about the linux-arm-kernel mailing list