linux-kernel - Re: [PATCH v4 4/6] bus: ti-sysc: Add support for software reset

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Date:   Fri, 6 Jul 2018 18:05:15 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     Tony Lindgren <tony@...mide.com>
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>, <robh+dt@...nel.org>,
        <bcousson@...libre.com>, <paul@...an.com>, <t-kristo@...com>,
        <mark.rutland@....com>
Subject: Re: [PATCH v4 4/6] bus: ti-sysc: Add support for software reset

Hi,

On Friday 06 July 2018 04:05 PM, Tony Lindgren wrote:
> * Faiz Abbas <faiz_abbas@...com> [180706 10:05]:
>> Hi,
>>
>> On Thursday 05 July 2018 09:17 PM, Tony Lindgren wrote:
>>> * Faiz Abbas <faiz_abbas@...com> [180705 14:24]:
>>>> +static int sysc_reset(struct sysc *ddata)
>>>> +{
>>>> +	int offset = ddata->offsets[SYSC_SYSCONFIG];
>>>> +	int val = sysc_read(ddata, offset);
>>>
>>> Can you please just warn and return early for now if no
>>> syss_mask is specified? Otherwise we'll have mysterious
>>> errors if somebody leaves out "ti,hwmods" for module types
>>> we do not yet support reset for.
>>
>> RESET write to sysconfig can still happen even if there's no syss_mask
>> right? Not all modules need to poll on reset status.
> 
> It can but we currently don't have anything similar to
> srst_udelay like we have in _ocp_softreset(). And we don't
> currently have suport for sysc reset done bit.
> 
> So we want to warn and return error except in the known
> working case for now.
> 

Ok.

Thanks,
Faiz