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

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Message-ID: <20171204222528.wf6xpozisxu5udx5@rob-hp-laptop>
Date:   Mon, 4 Dec 2017 16:25:28 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sinan Kaya <okaya@...eaurora.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 Mon, Dec 04, 2017 at 01:05:51PM -0500, Sinan Kaya wrote:
> 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?

Ah yes, you are right.

> 
> > 
> >> +
> >> +       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.

Change the property API to pass struct device instead. That's maybe not 
worth it.

Rob