linux-kernel - Re: [PATCH 2/2] dt-binding: spi: Document Renesas R-Car RPC controller bindings

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Date:   Wed, 21 Nov 2018 02:51:08 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     masonccyang@...c.com.tw
Cc:     boris.brezillon@...tlin.com, broonie@...nel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms@...ge.net.au>, juliensu@...c.com.tw,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-spi@...r.kernel.org, tpiepho@...inj.com,
        zhengxunli@...c.com.tw
Subject: Re: [PATCH 2/2] dt-binding: spi: Document Renesas R-Car RPC
 controller bindings

On 11/21/2018 01:53 AM, masonccyang@...c.com.tw wrote:
> Hi Marek,

Hi,

>> Marek Vasut <marek.vasut@...il.com>
>> 2018/11/20 下午 08:57
>>
>> >> > diff --git a/Documentation/devicetree/bindings/spi/spi-renesas-
>> >> rpc.txt b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
>> >> > new file mode 100644
>> >> > index 0000000..8286cc8
>> >> > --- /dev/null
>> >> > +++ b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
>> >> > @@ -0,0 +1,33 @@
>> >> > +Renesas R-Car D3 RPC controller Device Tree Bindings
>> >> > +----------------------------------------------------
>> >> > +
>> >> > +Required properties:
>> >> > +- compatible: should be "renesas,rpc-r8a77995"
>> >> > +- #address-cells: should be 1
>> >> > +- #size-cells: should be 0
>> >> > +- reg: should contain 2 entries, one for the registers and one
>> >> for the direct
>> >> > +       mapping area
>> >> > +- reg-names: should contain "rpc_regs" and "dirmap"
>> >> > +- interrupts: interrupt line connected to the RPC SPI controller
>> >>
>> >> Do you also plan to support the RPC HF mode ? And if so, how would that
>> >> look in the bindings ? I'd like to avoid having to redesign the
> bindings
>> >> later to handle both the SPI and HF modes.
>> >>
>> >
>> > I patched this RPC SPI/Octa driver is for mx25uw51245g and you may also
>> > refer to Boris's patch. [1][2][3]
>>
>> Does this mean the driver is specific to one particular kind of flash ?
>>
> 
> No, this driver supports all SPI flash, spi, qspi and octa flash.
> 
> The target is Octa 8-8-8 DDR2 mode once spi-nor layer is merged.[1][2][3]

The HyperFlash must also be supported, cfr my previous comment that I'd
like to avoid redesigning the bindings again when the HF mode is added.

-- 
Best regards,
Marek Vasut