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From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Chris Brandt <Chris.Brandt@renesas.com>,
	Rob Herring <robh+dt@kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Mason Yang <masonccyang@mxic.com.tw>,
	"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>
Subject: Re: [PATCH RFC 0/2] Add Renesas RPC-IF support
Date: Wed, 11 Dec 2019 19:20:51 +0300	[thread overview]
Message-ID: <0af05149-78f5-8639-4a23-84edda0073ea@cogentembedded.com> (raw)
In-Reply-To: <TY1PR01MB156234F5B44BB43D3DCA98128A5A0@TY1PR01MB1562.jpnprd01.prod.outlook.com>

On 12/11/2019 05:33 PM, Chris Brandt wrote:

>> Here's a set of 2 patches against Linus' repo. Renesas Reduced Pin Count
>> Interface (RPC-IF) allows a SPI flash or HyperFlash connected to the SoC to
>> be accessed via the external address space read mode or the manual mode.
> 
> Looking at this driver, all it is are APIs. Meaning another driver is 
> needed to sit in between the MTD layer and this HW driver layer.
> 
> In the driver that I did, if the "RPC" HW is going to be used to control
> a SPI Flash device, it registered a spi controller and then the MTD 
> layer could access the device

   Via the SPI-to-MTD sublayer for (at least) direct mapping -- grep for "dirmap"
in drivers/mtd/spi-nor/spi-nor.c...

> just like any other SPI controller driver. No
> additional drivers are needed.

   Then why do we have *struct* spi_controller_mem_ops? Do All drivers implement
such ops?

[...]

MBR, Sergei

      parent reply	other threads:[~2019-12-11 16:20 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-10 19:34 [PATCH RFC 0/2] Add Renesas RPC-IF support Sergei Shtylyov
2019-12-10 19:37 ` [PATCH RFC 1/2] dt-bindings: memory: document Renesas RPC-IF bindings Sergei Shtylyov
2019-12-19 20:38   ` Rob Herring
2019-12-10 19:39 ` [PATCH RFC 2/2] memory: add Renesas RPC-IF driver Sergei Shtylyov
2019-12-11  9:58   ` Philipp Zabel
2020-02-10 10:21   ` Behme Dirk (CM/ESO2)
     [not found]     ` <5760bcdb-e44b-6f18-7262-9526684e5780-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
2020-02-22 20:42       ` Sergei Shtylyov
     [not found]         ` <5603f393-554d-e2a8-c2d8-6bafc20f4169-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2020-02-24  5:46           ` Behme Dirk (CM/ESO2)
     [not found]             ` <cba1e2ec-4896-23ef-ef7b-0f80d4310127-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
2020-02-24 17:28               ` Chris Brandt
2020-02-24 18:59             ` Sergei Shtylyov
2020-02-25  9:33               ` Behme Dirk (CM/ESO2)
     [not found]                 ` <3a182ac7-8d41-cdc7-2b87-7c503f68a426-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
2020-02-25 20:41                   ` Sergei Shtylyov
     [not found]                     ` <f21a9444-9541-6558-f5f5-ca0b733768ff-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2020-02-26  9:54                       ` Behme Dirk (CM/ESO2)
2020-02-27 20:32                         ` Sergei Shtylyov
2019-12-11 14:33 ` [PATCH RFC 0/2] Add Renesas RPC-IF support Chris Brandt
2019-12-11 16:08   ` Sergei Shtylyov
2019-12-11 16:20   ` Sergei Shtylyov [this message]

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