linux-kernel - Re: [PATCH/RFT v2 02/17] ARM: davinci: da8xx: Add CFGCHIP syscon platform declaration.

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Message-ID: <CAKXjFTOVuWRL+yuk6sARa2PAd6j-V4Ej5AmPGz7F7JXKidvJrg@mail.gmail.com>
Date:   Tue, 25 Oct 2016 11:37:18 +0200
From:   Axel Haslam <ahaslam@...libre.com>
To:     Sekhar Nori <nsekhar@...com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>, robh+dt@...nel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Kevin Hilman <khilman@...libre.com>,
        Sergei Shtylyov <sshtylyov@...mvista.com>,
        David Lechner <david@...hnology.com>,
        manjunath.goudar@...aro.org, Mark Brown <broonie@...nel.org>,
        Alexandre Bailon <abailon@...libre.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH/RFT v2 02/17] ARM: davinci: da8xx: Add CFGCHIP syscon
 platform declaration.

Hi Sekar,

On Tue, Oct 25, 2016 at 10:10 AM, Sekhar Nori <nsekhar@...com> wrote:
> On Monday 24 October 2016 10:16 PM, ahaslam@...libre.com wrote:
>> From: David Lechner <david@...hnology.com>
>>
>> The CFGCHIP registers are used by a number of devices, so using a syscon
>> device to share them. The first consumer of this will by the phy-da8xx-usb
>> driver.
>>
>> Signed-off-by: David Lechner <david@...hnology.com>
>> [Axel: minor fix: change id to -1]
>
> Can you please clarify this change? There could be other syscon devices
> on the chip for other common registers. Why use the singular device-id?
>

in the case of non DT boot, the phy driver is looking for "syscon" :

d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon");

if we register the syscon driver with id = 0, the actual name of the syscon
device will be "syscon.0" and the phy driver will fail to probe, because
the strncmp match in the syscon driver (syscon_match_pdevname)
will fail.

should i change the phy driver instead?


Regards,
Axel.



>> Signed-off-by: Axel Haslam <ahaslam@...libre.com>
>
> Thanks,
> Sekhar
>