linux-kernel - Re: [PATCH v2] ARM: dts: da850: add the mstpri and ddrctl nodes

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Message-ID: <m2bmx5x1y2.fsf@baylibre.com>
Date:   Wed, 23 Nov 2016 14:32:05 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     David Lechner <david@...hnology.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sekhar Nori <nsekhar@...com>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>,
        linux-devicetree <devicetree@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Jyri Sarha <jsarha@...com>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v2] ARM: dts: da850: add the mstpri and ddrctl nodes

David Lechner <david@...hnology.com> writes:

> On 11/23/2016 04:27 AM, Bartosz Golaszewski wrote:
>> 2016-11-22 23:23 GMT+01:00 David Lechner <david@...hnology.com>:
>>> On 11/15/2016 05:00 AM, Bartosz Golaszewski wrote:
>>>>
>>>> Add the nodes for the MSTPRI configuration and DDR2/mDDR memory
>>>> controller drivers to da850.dtsi.
>>>>
>>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>>> ---
>>>> v1 -> v2:
>>>> - moved the priority controller node above the cfgchip node
>>>> - renamed added nodes to better reflect their purpose
>>>>
>>>>  arch/arm/boot/dts/da850.dtsi | 8 ++++++++
>>>>  1 file changed, 8 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
>>>> index 1bb1f6d..412eec6 100644
>>>> --- a/arch/arm/boot/dts/da850.dtsi
>>>> +++ b/arch/arm/boot/dts/da850.dtsi
>>>> @@ -210,6 +210,10 @@
>>>>                         };
>>>>
>>>>                 };
>>>> +               prictrl: priority-controller@...10 {
>>>> +                       compatible = "ti,da850-mstpri";
>>>> +                       reg = <0x14110 0x0c>;
>>>
>>>
>>> I think we should add status = "disabled"; here and let boards opt in.
>>>
>>>> +               };
>>>>                 cfgchip: chip-controller@...7c {
>>>>                         compatible = "ti,da830-cfgchip", "syscon",
>>>> "simple-mfd";
>>>>                         reg = <0x1417c 0x14>;
>>>> @@ -451,4 +455,8 @@
>>>>                           1 0 0x68000000 0x00008000>;
>>>>                 status = "disabled";
>>>>         };
>>>> +       memctrl: memory-controller@...00000 {
>>>> +               compatible = "ti,da850-ddr-controller";
>>>> +               reg = <0xb0000000 0xe8>;
>>>
>>>
>>> same here. status = "disabled";
>>>
>>>> +       };
>>>>  };
>>>>
>>
>> Hi David,
>>
>> I did that initially[1][2] and it was rejected by Kevin[3] and Laurent[4].
>>
>> FYI this patch has already been queued by Sekhar.
>
> Thanks. I did not see those threads.
>
> FYI to maintainers, having these enabled by default causes error
> messages in the kernel log for other boards that are not supported by
> the drivers.

Then the driver is too noisy and should be cleaned up.

> Since there is only one board that is supported and soon
> to be 2 that are not, I would rather have this disabled by default to
> avoid the error messages.

IMO, what exactly are the error messages? Sounds like the driver is
being too verbose, and calling things errors that are not really errors.

Kevin