linux-kernel - Re: [PATCH V6 4/7] OF: properties: Implement get_match

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Message-ID: <20171207162036.6a71a4f5@karo-electronics.de>
Date:   Thu, 7 Dec 2017 16:20:36 +0100
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        timur@...eaurora.org, open list <linux-kernel@...r.kernel.org>,
        linux-acpi@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        dmaengine@...r.kernel.org, Frank Rowand <frowand.list@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V6 4/7] OF: properties: Implement get_match_data()
 callback

Hi,

On Thu, 7 Dec 2017 09:45:31 -0500 Sinan Kaya wrote:
> On 12/7/2017 8:10 AM, Lothar Waßmann wrote:
> >> +void *of_fwnode_get_match_data(const struct fwnode_handle *fwnode,
> >> +			       struct device *dev)
> > Shouldn't this be 'const void *of_fwnode_get_match_data
> 
> OF keeps the driver data as a (const void*) internally. ACPI keeps the
> driver data as kernel_ulong_t in struct acpi_device_id.
> 
> I tried to find the middle ground here by converting output to void*
> but not keeping const.
> 
It should be no problem to cast a (const void *) to an unsigned long
data type (without const qualifier).


Lothar Waßmann