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

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Message-ID: <20180705154758.GA112168@atomide.com>
Date:   Thu, 5 Jul 2018 08:47:58 -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> [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.

> +	val |= (0x1 << ddata->cap->regbits->srst_shift);
> +	sysc_write(ddata, offset, val);
> +
> +	/* Poll on reset status */
> +	if (ddata->cfg.syss_mask) {
> +		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;
> +}
> +

Otherwise looks good to me.

Thanks,

Tony