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From: "Tony Huang 黃懷厚" <tony.huang@sunplus.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: DTML <devicetree@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Derek Kiernan" <derek.kiernan@xilinx.com>,
	"Dragan Cvetic" <dragan.cvetic@xilinx.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	gregkh <gregkh@linuxfoundation.org>,
	"Wells Lu 呂芳騰" <wells.lu@sunplus.com>,
	黃懷厚 <tonyhuang.sunplus@gmail.com>
Subject: RE: [PATCH v4 2/2] misc: Add iop driver for Sunplus SP7021
Date: Fri, 17 Dec 2021 11:03:36 +0000	[thread overview]
Message-ID: <d7db8a508e9b4eb8933f4862087919b2@sphcmbx02.sunplus.com.tw> (raw)
In-Reply-To: <CAK8P3a0cA7iL=ug6hiqWAV1-qFSoCN-R7jrXv0cqByUDJV4x0Q@mail.gmail.com>

Dear Arnd:
> 
> > 3.So you ask me to control IOP(8051) through file_operations, not
> > through DEVICE_ATTR
> 
> No, neither of them. Use the appropriate drivers/*/ subsystems for any
> functionality that has an existing subsystem. If there is something that the iop
> does that does not yet have a subsystem, that requires a more thorough design
> discussion for creating a new user interface, ideally in a hardware-independent
> way. You should not start with that until all the normal features (rtc, wakeup,
> suspend, gpio, ...) are supported.
> 

IOP(8051) has 12 bytes Mailbox registers, which can be read and written by IOP(8051) and System, used to exchange information with the system, faster than shared memory.

Thanks			

  parent reply	other threads:[~2021-12-17 11:03 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-16  2:34 [PATCH v4 0/2] " Tony Huang
2021-12-16  2:34 ` [PATCH v4 1/2] dt-binding: misc: Add iop yaml file " Tony Huang
2021-12-16  2:35 ` [PATCH v4 2/2] misc: Add iop driver " Tony Huang
     [not found]   ` <YbrsbtBgUDnjZJ/o@kroah.com>
     [not found]     ` <CAHpW4oRTcXq6k2o4cjFeHznZrR737947UPE60nWyPTRLPTR0Gw@mail.gmail.com>
2021-12-17  8:10       ` Tony Huang 黃懷厚
2021-12-17  8:24         ` gregkh
2021-12-20  8:35           ` Tony Huang 黃懷厚
     [not found]   ` <CAK8P3a0CnCK-Dfodp-jTzZApM_1NpdY7DV2fRqnO=gaju5xGwg@mail.gmail.com>
     [not found]     ` <CAHpW4oQmtd-gG1HYZT-Dk=QAvXKsKebzcOaVtrEeoujwoL9zSg@mail.gmail.com>
     [not found]       ` <316c16afbff74160b07bd74444f3b8e1@sphcmbx02.sunplus.com.tw>
2021-12-17  6:54         ` gregkh
2021-12-17  8:12         ` Arnd Bergmann
2021-12-17 10:24           ` Tony Huang 黃懷厚
2021-12-17 11:03           ` Tony Huang 黃懷厚 [this message]
2021-12-22  7:20           ` Tony Huang 黃懷厚

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