linux-kernel - Re: [PATCH v9 24/27] dt-bindings: timer: new bindings for TI DaVinci timer

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Message-ID: <7cea07f1-e174-8496-a27a-01f0e3082054@lechnology.com>
Date:   Tue, 1 May 2018 20:52:18 -0500
From:   David Lechner <david@...hnology.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Adam Ford <aford173@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 24/27] dt-bindings: timer: new bindings for TI DaVinci
 timer

Sekhar,

On 04/27/2018 09:05 AM, Rob Herring wrote:
> On Thu, Apr 26, 2018 at 07:17:42PM -0500, David Lechner wrote:
>> This adds new device tree bindings for the timer IP block of TI
>> DaVinci-like SoCs.
>>
>> Signed-off-by: David Lechner <david@...hnology.com>
>> ---
>>
>> v9 changes:
>> - new patch in v9
>>
>>
>>   .../bindings/timer/ti,davinci-timer.txt       | 24 +++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/timer/ti,davinci-timer.txt
>>
>> diff --git a/Documentation/devicetree/bindings/timer/ti,davinci-timer.txt b/Documentation/devicetree/bindings/timer/ti,davinci-timer.txt
>> new file mode 100644
>> index 000000000000..2091eca46981
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/timer/ti,davinci-timer.txt
>> @@ -0,0 +1,24 @@
>> +* Device tree bindings for Texas Instruments DaVinci timer
>> +
>> +This document provides bindings for the 64-bit timer in the DaVinci
>> +architecture devices. The timer can be configured as a general-purpose 64-bit
>> +timer, dual general-purpose 32-bit timers. When configured as dual 32-bit
>> +timers, each half can operate in conjunction (chain mode) or independently
>> +(unchained mode) of each other.
>> +
>> +It is global timer is a free running up-counter and can generate interrupt
> 
> Doesn't make sense, too many 'is'.
> 
> There's no interrupt property listed.
> 
>> +when the counter reaches preset counter values.
>> +
>> +Required properties:
>> +
>> +- compatible : should be "ti,davinci-timer".
>> +- reg : specifies base physical address and count of the registers.
>> +- clocks : the clock feeding the timer clock.
>> +
>> +Example:
>> +
>> +	clocksource: timer@...00 {
>> +		compatible = "ti,davinci-timer";
>> +		reg = <0x20000 0x1000>;
>> +		clocks = <&pll0_auxclk>;
>> +	};
>> -- 
>> 2.17.0
>>

What do you think about trying to reuse the keystone timer here instead of
introducing our own binding? I assume it is basically the same since the
watchdog timer is shared already between davinci and keystone.