linux-kernel - Re: [PATCH 5/8] mfd: Add ST's Low Power Controller driver

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Message-ID: <20141215135052.GC13885@x1>
Date:	Mon, 15 Dec 2014 13:50:52 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, a.zummo@...ertech.it,
	rtc-linux@...glegroups.com, wim@...ana.be,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 5/8] mfd: Add ST's Low Power Controller driver

On Mon, 15 Dec 2014, Arnd Bergmann wrote:

> On Monday 15 December 2014 11:25:35 Lee Jones wrote:
> > +       ret = of_property_read_u32(np, "st,lpc-mode", &mode);
> > +       if (ret) {
> > +               dev_err(&pdev->dev, "An LPC mode must be selected\n");
> > +               return ret;
> > +       }
> > +
> > +       switch (mode) {
> > +       case ST_LPC_MODE_RTC:
> > +               cell->name = "st-lpc-rtc";
> > +               break;
> > +       case ST_LPC_MODE_WDT:
> > +               cell->name = "st-lpc-wdt";
> > +               break;
> > +       default:
> > +               dev_err(&pdev->dev, "Unsupported mode: %d\n", mode);
> > +               return ret;
> > +       }
> > +
> > +       /* Pass resources though to selected child device. */
> > +       cell->resources = pdev->resource;
> > +       cell->num_resources = pdev->num_resources;
> > +
> > +       ret = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
> > +                             cell, 1, NULL, 0, NULL);
> > 
> 
> I don't think it's necessary to have the MFD node if only one of the
> two modes can be used based on a DT property. It should be enough
> to have both the rtc and the wdt driver list the same compatible
> string and check the property in the probe function to decide if
> they want to drive the device or not:

I tried that and it didn't work.  Only one driver probed.

> 	ret = of_property_read_u32(np, "st,lpc-mode", &mode);
> 	if (!ret && mode != ST_LPC_MODE_RTC)
> 		return -ENXIO
> 
> 
> 	Arnd

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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