linux-kernel - Re: [PATCH 2/4] fpga: dfl: Move DFH header register macros to linux/dfl.h

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Message-ID: <0257dcaf-348a-375d-6ed8-657974208e30@silicom.dk>
Date:   Wed, 23 Jun 2021 13:56:59 +0200
From:   Martin Hundebøll <mhu@...icom.dk>
To:     "Wu, Hao" <hao.wu@...el.com>, "Xu, Yilun" <yilun.xu@...el.com>
Cc:     Tom Rix <trix@...hat.com>, Moritz Fischer <mdf@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Martin Hundebøll <mhu@...nix.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        Debarati Biswas <debaratix.biswas@...el.com>,
        "Weight, Russell H" <russell.h.weight@...el.com>
Subject: Re: [PATCH 2/4] fpga: dfl: Move DFH header register macros to
 linux/dfl.h



On 22/06/2021 09.39, Wu, Hao wrote:
>> On Mon, Jun 21, 2021 at 06:19:15PM +0800, Wu, Hao wrote:
>>>> Subject: [PATCH 2/4] fpga: dfl: Move DFH header register macros to
>> linux/dfl.h
>>>>
>>>> From: Debarati Biswas <debaratix.biswas@...el.com>
>>>>
>>>> Device Feature List (DFL) drivers may be defined in subdirectories other
>>>> than drivers/fpga, and each DFL driver should have access to the Device
>>>> Feature Header (DFH) register, which contains revision and type
>>>> information. This change moves the macros specific to the DFH register
>>>> from drivers/fpga/dfl.h to include/linux/dfl.h.
>>>
>>> Looks like it requires to access the revision info in the next patch, because
>>> current dfl_device doesn't expose related information.
>>>
>>> @Yilun, do you have any concern to expose those info via dfl_device?
>>
>> Exposing these header register definitions are good to me. These registers
>> are in DFL device's MMIO region, so it is good to share these info with
>> all DFL drivers.
> 
> I mean expose revision via dfl_device, as dfl core already reads the DFL
> header, it sounds duplicate read in each dfl device driver. And if we
> consider this as a common need from dfl device driver, then the code
> can be moved to a common place as well.
> 
> I hope from dfl device driver side, it doesn't need to know details of
> how DFH register is defined, only simple way from dfl device data
> structure or some simple helper function, then dfl device driver could
> know all common information from DFH.
> 
> How do you think?

struct dfl_device {} already has "u16 type" and "u16 feature_id", so it would make sense to add "u8 feature_rev" as well?

// Martin