linux-kernel - Re: [PATCH v12 7/7] nvmem: core: Expose cells through sysfs

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Message-ID: <20231011105829.778bed58@xps-13>
Date:   Wed, 11 Oct 2023 10:58:29 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Walle <michael@...le.cc>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Robert Marko <robert.marko@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Randy Dunlap <rdunlap@...radead.org>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH v12 7/7] nvmem: core: Expose cells through sysfs

Hi Srinivas,

srinivas.kandagatla@...aro.org wrote on Wed, 11 Oct 2023 09:45:11 +0100:

> On 11/10/2023 09:33, Miquel Raynal wrote:
> > Hi Srinivas,
> > 
> > srinivas.kandagatla@...aro.org wrote on Wed, 11 Oct 2023 09:27:20 +0100:
> >   
> >> On 11/10/2023 08:15, Miquel Raynal wrote:  
> >>>>> +
> >>>>> +	nvmem_cells_group.bin_attrs = cells_attrs;
> >>>>> +
> >>>>> +	ret = devm_device_add_groups(&nvmem->dev, nvmem_cells_groups);
> >>>>> +	if (ret)
> >>>>> +		goto unlock_mutex;  
> >>>> This is going to create groups after the nvmem device is added, isn't this going to be problem with user space notifications?  
> >>> Greg said it was not. I hope I understood correctly 😄
> >>>
> >>> And anyway, cells have never been available to userspace, so there is
> >>> nothing userspace might expect yet?  
> >> I agree, but once we add sysfs uapi then this is going to change.  
> > 
> > Can you elaborate? I'm not sure I follow you here. Is there still a
> > problem you fear or you think it's okay?
> >   
> Now that we add cells to sysfs.
> AFAIU, By the time the userspace sees the udev event from this device we might not have cells populated.

Yes, but why would this be a problem?

Thanks,
Miquèl