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

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Message-ID: <20180706103541.GC112168@atomide.com>
Date:   Fri, 6 Jul 2018 03:35:41 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Faiz Abbas <faiz_abbas@...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

* 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.

Regards,

Tony