linux-kernel - Re: [PATCH v3 4/6] bus: ti-sysc: Add support for software reset

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Date:   Thu, 7 Jun 2018 15:54:01 +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>, <mark.rutland@....com>,
        <paul@...an.com>, <t-kristo@...com>, <robh+dt@...nel.org>,
        <bcousson@...libre.com>
Subject: Re: [PATCH v3 4/6] bus: ti-sysc: Add support for software reset

Hi,

On Thursday 07 June 2018 01:05 PM, Tony Lindgren wrote:
> * Faiz Abbas <faiz_abbas@...com> [180606 06:14]:
>> +static int sysc_reset(struct sysc *ddata)
>> +{
>> +	int offset = ddata->offsets[SYSC_SYSCONFIG];
>> +	int val = sysc_read(ddata, offset);
>> +
>> +	val |= (0x1 << ddata->cap->regbits->srst_shift);
>> +	sysc_write(ddata, offset, val);
>> +
>> +	/* Poll on reset status */
>> +	if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
>> +		offset = ddata->offsets[SYSC_SYSSTATUS];
>> +
>> +		return readl_poll_timeout(ddata->module_va + offset, val,
>> +				(val & ddata->cfg.syss_mask) == 0x0,
>> +				100, MAX_MODULE_SOFTRESET_WAIT);
>> +	}
>> +
>> +	return 0;
>> +}
> 
> I wonder if we should also add SYSS_QUIRK_RESET_STATUS in
> addition to SYSC_QUIRK_RESET status to make it easy to
> read the right register?

I assumed SYSC_QUIRK is the prefix to indicate the ti-sysc driver not
the register. Are there layouts in which the reset status bit is in the
sysconfig register rather than the sysstatus register?

Thanks,
Faiz