linux-kernel - Re: [PATCH 04/10] rtc: at91rm9200: use of_platform

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Date:   Thu, 9 Jan 2020 12:52:41 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Eugen.Hristev@...rochip.com
Cc:     jic23@...nel.org, robh+dt@...nel.org, Nicolas.Ferre@...rochip.com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org, a.zummo@...ertech.it,
        Ludovic.Desroches@...rochip.com
Subject: Re: [PATCH 04/10] rtc: at91rm9200: use of_platform_populate as
 return value

On 09/01/2020 11:19:45+0000, Eugen.Hristev@...rochip.com wrote:
> I started to work on this, I am trying to add and probe the 
> rtc_adc_trigger with platform_device_add.
> 
> However, some issues arise: this means that the rtc_adc_trigger will not 
> be OF-compatible, so, how can I identify the driver to probe ?
> Second, by adding a new platform device from the RTC driver, would mean 
> that I would have to supply it's probe/remove functions, which I cannot 
> have here. Those are in the rtc_adc_trigger iio driver.
> 
> In fact, the question is, which is the mechanism you suggested, to be 
> able to probe the rtc_adc_trigger, from inside the rtc driver, without 
> using a child node in DT, as you requested ?
> The rtc_adc_trigger needs a MEM resource, and a parent, and it must 
> reside inside the IIO subsystem.
> 

As suggested earlier in the thread, you can use platform_add_device
which fits all your requirements.


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com