linux-kernel - Re: [PATCH v2 3/6] clk: ti: dra7: Add clkctrl clock data for the mcan clocks

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Message-ID: <d7532c7a-d2ae-5cbf-cfd0-c347b975ed6b@ti.com>
Date:   Fri, 1 Jun 2018 12:18:37 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     Tero Kristo <t-kristo@...com>, Rob Herring <robh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-clk@...r.kernel.org>, <bcousson@...libre.com>,
        <tony@...mide.com>, <paul@...an.com>
Subject: Re: [PATCH v2 3/6] clk: ti: dra7: Add clkctrl clock data for the mcan
 clocks

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


Thanks,
Faiz