From: Joseph Lo <josephl@nvidia.com>
To: Jon Hunter <jonathanh@nvidia.com>,
Thierry Reding <thierry.reding@gmail.com>
Cc: devicetree@vger.kernel.org,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/6] dt-bindings: timer: add Tegra210 timer
Date: Mon, 28 Jan 2019 11:09:25 +0800 [thread overview]
Message-ID: <1d12f949-1a06-fd17-141d-bd04b72cda3c@nvidia.com> (raw)
In-Reply-To: <381f94c0-6c19-0f5b-df06-91353455a4c0@nvidia.com>
On 1/25/19 8:01 PM, Jon Hunter wrote:
>
> On 25/01/2019 03:23, Joseph Lo wrote:
>> Hi Jon,
>>
>> Thanks for reviewing.
>>
>> On 1/24/19 6:30 PM, Jon Hunter wrote:
>>>
>>> On 07/01/2019 03:28, Joseph Lo wrote:
>>>> The Tegra210 timer provides fourteen 29-bit timer counters and one
>>>> 32-bit
>>>> timestamp counter. The TMRs run at either a fixed 1 MHz clock rate
>>>> derived
>>>> from the oscillator clock (TMR0-TMR9) or directly at the oscillator
>>>> clock
>>>> (TMR10-TMR13). Each TMR can be programmed to generate one-shot periodic,
>>>> or watchdog interrupts.
>>>>
>>>> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
>>>> Cc: Thomas Gleixner <tglx@linutronix.de>
>>>> Cc: linux-kernel@vger.kernel.org
>>>> Cc: devicetree@vger.kernel.org
>>>> Signed-off-by: Joseph Lo <josephl@nvidia.com>
>>>> ---
>>>> .../bindings/timer/nvidia,tegra210-timer.txt | 25 +++++++++++++++++++
>>>> 1 file changed, 25 insertions(+)
>>>> create mode 100644
>>>> Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
>>>> b/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
>>>> new file mode 100644
>>>> index 000000000000..ba511220a669
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
>>>> @@ -0,0 +1,25 @@
>>>> +NVIDIA Tegra210 timer
>>>> +
>>>> +The Tegra210 timer provides fourteen 29-bit timer counters and one
>>>> 32-bit
>>>> +timestamp counter. The TMRs run at either a fixed 1 MHz clock rate
>>>> derived
>>>> +from the oscillator clock (TMR0-TMR9) or directly at the oscillator
>>>> clock
>>>> +(TMR10-TMR13). Each TMR can be programmed to generate one-shot,
>>>> periodic,
>>>> +or watchdog interrupts.
>>>> +
>>>> +Required properties:
>>>> +- compatible : "nvidia,tegra210-timer".
>>>> +- reg : Specifies base physical address and size of the registers.
>>>> +- interrupts : A list of 4 interrupts; one per each of TMR10 through
>>>> TMR13.
>>>
[snip]
>> And notice that only TMR10-TMR13 are running at the oscillator clock
>> (clk_m). With the Tegra210 timer driver, we introduce in this series,
>> which only replace the clock event device function that was originally
>> owned by the arch timer (armv8 timer) and it also running at the
>> oscillator clock. The sched_timer still owns by the arch timer. So the
>> timer resolution will be the same. That's why we choose TMR10-TMR13 as
>> the timer for Tegra210.
>
> That maybe fine, but DT should describe the hardware and so I don't see
> why we would not list all the interrupts. We can still only use TMR10-13
> in the driver.
>
Okay, will list all the interrupts for each timer channel.
Thanks,
Joseph
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next prev parent reply other threads:[~2019-01-28 3:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-07 3:28 [PATCH 0/6] Add CPUidle support for Tegra210 Joseph Lo
2019-01-07 3:28 ` [PATCH 1/6] dt-bindings: timer: add Tegra210 timer Joseph Lo
2019-01-11 22:21 ` Rob Herring
2019-01-24 10:30 ` Jon Hunter
2019-01-25 3:23 ` Joseph Lo
2019-01-25 12:01 ` Jon Hunter
2019-01-25 12:06 ` Jon Hunter
2019-01-28 3:09 ` Joseph Lo [this message]
2019-01-07 3:28 ` [PATCH 2/6] clocksource: tegra: add Tegra210 timer driver Joseph Lo
2019-01-24 11:09 ` Jon Hunter
2019-01-25 4:12 ` Joseph Lo
2019-01-07 3:28 ` [PATCH 3/6] arm64: dts: tegra210: fix timer node Joseph Lo
2019-01-24 11:16 ` Jon Hunter
2019-01-25 3:56 ` Joseph Lo
2019-01-07 3:28 ` [PATCH 4/6] arm64: dts: tegra210: add CPU idle states properties Joseph Lo
2019-01-24 11:21 ` Jon Hunter
2019-01-25 3:58 ` Joseph Lo
2019-01-07 3:28 ` [PATCH 5/6] arm64: dts: tegra210-p2180: Enable CPU idle support Joseph Lo
2019-01-07 3:28 ` [PATCH 6/6] arm64: dts: tegra210-smaug: " Joseph Lo
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