linux-kernel - Re: [PATCH 1/3] ARM: dra762: hwmod: Add MCAN support

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Date:   Thu, 17 May 2018 13:43:48 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <bcousson@...libre.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>, <paul@...an.com>,
        <lokeshvutla@...com>, <linux@...linux.org.uk>
Subject: Re: [PATCH 1/3] ARM: dra762: hwmod: Add MCAN support

Hi Tony,

On Tuesday 15 May 2018 10:53 PM, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [180515 17:20]:
>> * Tony Lindgren <tony@...mide.com> [180515 17:17]:
>>> * Faiz Abbas <faiz_abbas@...com> [180515 06:05]:
>>>> Hi Tony,
>>>>
>>>> On Tuesday 01 May 2018 08:56 PM, Tony Lindgren wrote:
>>>>> Hi,
>>>>>
>>>>> * Faiz Abbas <faiz_abbas@...com> [180408 09:59]:
>>>>>> From: Lokesh Vutla <lokeshvutla@...com>
>>>>>>
>>>>>> Add MCAN hwmod data and register it for dra762 silicons.
>>>>>>
>>>>>> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
>>>>>> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
>>>>>> ---
>>>>>>  arch/arm/mach-omap2/omap_hwmod_7xx_data.c | 32 +++++++++++++++++++++++++++++++
>>>>>>  1 file changed, 32 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
>>>>>> index 62352d1..a2cd7f8 100644
>>>>>> --- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
>>>>>> +++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
>>>>>> @@ -1356,6 +1356,29 @@ static struct omap_hwmod dra7xx_mailbox13_hwmod = {
>>>>>>  };
>>>>>>  
>>>>>>  /*
>>>>>> + * 'mcan' class
>>>>>> + *
>>>>>> + */
>>>>>> +static struct omap_hwmod_class dra76x_mcan_hwmod_class = {
>>>>>> +	.name	= "mcan",
>>>>>> +};
>>>>>
>>>>> Looks like you're missing the related struct omap_hwmod_class_sysconfig
>>>>> entry for this with the rev and sysconfig registers.
>>>>>
>>>>
>>>> Sorry, I missed this email earlier. The MCAN module doesn't have
>>>> sysconfig registers.
>>>
>>> If there's no sysconfig register you should have no need for adding
>>> anything to omap_hwmod_7xx_data.c. We now have the dts clkctrl
>>> clocks, you can just add that to the dts node for the device.
>>
>> However.. My guess is there is somewhere a top level interconnect
>> target module that uses DRA7XX_CM_WKUPAON_ADC_CLKCTRL. And that
>> module may have multiple child devices.
> 
> And I'm guessing the top level module with sysconfig related
> registers is named "adc" :)
> 

Yes. The MCAN clocks are controlled by the ADC_CLKCTRL register.
Please see TRM:
http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=spruie9&fileType=pdf
page: 1530

Thanks,
Faiz