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From: Faiz Abbas <faiz_abbas@ti.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Tero Kristo <t-kristo@ti.com>, Rob Herring <robh@kernel.org>,
	<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-omap@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-clk@vger.kernel.org>, <bcousson@baylibre.com>,
	<paul@pwsan.com>
Subject: Re: [PATCH v2 3/6] clk: ti: dra7: Add clkctrl clock data for the mcan clocks
Date: Mon, 4 Jun 2018 19:28:01 +0530	[thread overview]
Message-ID: <6df7e0cd-5574-aa19-6c99-4438e5e377e0@ti.com> (raw)
In-Reply-To: <20180601142613.GU5705@atomide.com>

Hi,

On Friday 01 June 2018 07:56 PM, Tony Lindgren wrote:
> * Faiz Abbas <faiz_abbas@ti.com> [180601 06:49]:
>> Hi,
>>
>> On Thursday 31 May 2018 06:59 PM, Tero Kristo wrote:
>>> On 31/05/18 13:14, Faiz Abbas wrote:
>>>> Hi,
>>>>
>>>> On Thursday 31 May 2018 09:33 AM, Rob Herring wrote:
>>>>> On Wed, May 30, 2018 at 07:41:30PM +0530, Faiz Abbas wrote:
>>>>>> Add clkctrl data for the m_can clocks and register it within the
>>>> ...
>>>>>>   diff --git a/include/dt-bindings/clock/dra7.h
>>>>>> b/include/dt-bindings/clock/dra7.h
>>>>>> index 5e1061b15aed..d7549c57cac3 100644
>>>>>> --- a/include/dt-bindings/clock/dra7.h
>>>>>> +++ b/include/dt-bindings/clock/dra7.h
>>>>>> @@ -168,5 +168,6 @@
>>>>>>   #define DRA7_COUNTER_32K_CLKCTRL    DRA7_CLKCTRL_INDEX(0x50)
>>>>>>   #define DRA7_UART10_CLKCTRL    DRA7_CLKCTRL_INDEX(0x80)
>>>>>>   #define DRA7_DCAN1_CLKCTRL    DRA7_CLKCTRL_INDEX(0x88)
>>>>>> +#define DRA7_ADC_CLKCTRL    DRA7_CLKCTRL_INDEX(0xa0)
>>>>>
>>>>> ADC and mcan are the same thing?
>>>>>
>>>>
>>>> The register to control MCAN clocks is called ADC_CLKCTRL, Yes.
>>>
>>> Is there any reason for this or is that just a documentation bug?
>>>
>>
>> Looks like they meant to have an ADC in dra74 or dra72 but decided
>> against it and then many years later used the same registers for MCAN
>> instead. You can see ADC_CLKCTRL exists in dra72 TRM but is explicitly
>> disabled.
>>
>> http://www.ti.com/lit/ug/spruic2b/spruic2b.pdf pg:1524
> 
> How about make add also something like to dra7.h:
> 
> #define DRA7_MCAN_CLKCTRL DRA7_ADC_CLKCTRL
> 
> And you can add a comment to the dts file to avoid people
> getting confused with this constantly.
> 

I would prefer to follow the TRM so that people don't look for registers
that don't exist at all.

Thanks,
Faiz

  reply	other threads:[~2018-06-04 13:57 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-30 14:11 [PATCH v2 0/6] Add MCAN Support for dra76x Faiz Abbas
2018-05-30 14:11 ` [PATCH v2 1/6] ARM: dra762: hwmod: Add MCAN support Faiz Abbas
2018-05-30 14:50   ` Tony Lindgren
2018-05-30 15:15     ` Tero Kristo
2018-05-30 15:28       ` Tony Lindgren
2018-05-30 15:41         ` Tero Kristo
2018-05-30 15:54           ` Tony Lindgren
2018-05-31  6:15             ` Tero Kristo
2018-05-31 15:26               ` Tony Lindgren
2018-05-31 16:35                 ` Faiz Abbas
2018-05-31 16:39                   ` Tony Lindgren
2018-05-30 14:11 ` [PATCH v2 2/6] ARM: dts: dra762: Add MCAN clock support Faiz Abbas
2018-05-30 14:11 ` [PATCH v2 3/6] clk: ti: dra7: Add clkctrl clock data for the mcan clocks Faiz Abbas
2018-05-31  4:03   ` Rob Herring
2018-05-31 10:14     ` Faiz Abbas
2018-05-31 13:29       ` Tero Kristo
2018-06-01  6:48         ` Faiz Abbas
2018-06-01 14:26           ` Tony Lindgren
2018-06-04 13:58             ` Faiz Abbas [this message]
2018-05-30 14:11 ` [PATCH v2 4/6] bus: ti-sysc: Add support for using ti-sysc for MCAN on dra76x Faiz Abbas
2018-05-30 14:57   ` Tony Lindgren
2018-05-31 10:16     ` Faiz Abbas
2018-05-31 13:50       ` Tony Lindgren
2018-05-31  4:08   ` Rob Herring
2018-05-30 14:11 ` [PATCH v2 5/6] ARM: dts: Add generic interconnect target module node for MCAN Faiz Abbas
2018-05-30 15:04   ` Tony Lindgren
2018-05-31 10:21     ` Faiz Abbas
2018-05-31 13:45       ` Tony Lindgren
2018-05-31 16:38         ` Faiz Abbas
2018-05-31  4:06   ` Rob Herring
2018-05-31 11:26     ` Faiz Abbas
2018-05-31 13:41       ` Tony Lindgren
2018-06-02  6:32   ` Stephen Boyd
2018-06-04  5:49     ` Faiz Abbas
2018-05-30 14:11 ` [PATCH v2 6/6] ARM: dts: dra76x: Add MCAN node Faiz Abbas
2018-05-30 15:07   ` Tony Lindgren

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