linux-kernel - Re: Using firmware interface to write configuration blob to MMR space

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Message-ID: <1440543466.26026.5.camel@decadent.org.uk>
Date:	Tue, 25 Aug 2015 23:57:46 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Murali Karicheri <m-karicheri2@...com>, linux-firmware@...nel.org
Cc:	"Kwok, WingMan" <w-kwok2@...com>, linux-kernel@...r.kernel.org
Subject: Re: Using firmware interface to write configuration blob to MMR
 space

On Tue, 2015-08-25 at 16:12 -0400, Murali Karicheri wrote:
> On 08/25/2015 02:52 PM, Murali Karicheri wrote:
> > All,
> > 
> > One of our SoC integrates a hardware block from a hardware vendor. The
> > vendor has provided a configuration blob that is used to customize the
> > hardware block for a specific application. This configuration blob is to
> > be written to the MMR space to customize the hardware. The vendor is not
> > willing to provide details of the registers. So I am wondering if I
> > could use the firmware API (request_firmware) to copy the blob to the
> > kernel space so that driver could write these values to the MMR space.
> > Is this an acceptable way of using the firmware interface? My research
> > so far doesn't see the interface used this way and looking for your
> > expert opinion.

I think this would be an entirely reasonable use of request_firmware().

Ben.

-- 
Ben Hutchings
If you seem to know what you are doing, you'll be given more to do.


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