linux-kernel - Re: [PATCH V5 4/7] OF: properties: Implement get_match

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Date:   Mon, 4 Dec 2017 13:05:51 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>, Timur Tabi <timur@...eaurora.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Frank Rowand <frowand.list@...il.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V5 4/7] OF: properties: Implement get_match_data()
 callback

On 12/4/2017 11:23 AM, Rob Herring wrote:
> On Fri, Dec 1, 2017 at 10:27 PM, Sinan Kaya <okaya@...eaurora.org> wrote:
>> Now that we have a get_match_data() callback as part of the firmware node,
>> implement the OF specific piece for it.
>>
>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>> ---
>>  drivers/of/property.c | 17 +++++++++++++++++
>>  1 file changed, 17 insertions(+)
>>
..

>>
>> +void *of_fwnode_get_match_data(const struct fwnode_handle *fwnode,
>> +                              const struct device_driver *drv)
>> +{
>> +       const struct device_node *node = to_of_node(fwnode);
>> +       const struct of_device_id *match;
>> +
>> +       if (!node)
>> +               return NULL;
> 
> of_match_node checks this.

I see a check for the matches argument but not for the node argument.
Am I missing something?

> 
>> +
>> +       match = of_match_node(drv->of_match_table, node);
>> +       if (!match)
>> +               return NULL;
>> +
>> +       return (void *)match->data;
> 
> Don't need a cast here.

I can fix this.

> 
> of_device_get_match_data() already does most of this, but getting a
> device ptr from fwnode_handle may not be possible?

I couldn't figure out how to do that. Do you have a suggestion?
I have been looking for examples with no luck.

> 
> Rob
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.