linux-kernel - Re: [PATCH v2] base: soc: Handle custom soc information sysfs entries

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Date:   Tue, 08 Oct 2019 10:10:08 -0700
From:   mnalajal@...eaurora.org
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Stephen Boyd <swboyd@...omium.org>, rafael@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH v2] base: soc: Handle custom soc information sysfs entries

On 2019-10-08 08:43, Greg KH wrote:
> On Tue, Oct 08, 2019 at 08:33:11AM -0700, Stephen Boyd wrote:
>> Quoting Murali Nalajala (2019-10-07 13:37:42)
>> > Soc framework exposed sysfs entries are not sufficient for some
>> > of the h/w platforms. Currently there is no interface where soc
>> > drivers can expose further information about their SoCs via soc
>> > framework. This change address this limitation where clients can
>> > pass their custom entries as attribute group and soc framework
>> > would expose them as sysfs properties.
>> >
>> > Signed-off-by: Murali Nalajala <mnalajal@...eaurora.org>
>> > ---
>> 
>> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
>> 
> 
> Nice, can we convert the existing soc drivers to use this interface
> instead of the "export the device pointer" mess that they currently
> have?  That way we can drop that function entirely.
> 
Thank you for the reviews.
In the current linux tree i can find these driver instances who is using 
"soc_device_to_device" for populating their sysfs entries.

drivers/soc/ux500/ux500-soc-id.c:       parent = 
soc_device_to_device(soc_dev);
drivers/soc/tegra/fuse/fuse-tegra.c:    return 
soc_device_to_device(dev);
drivers/soc/amlogic/meson-gx-socinfo.c: dev = 
soc_device_to_device(soc_dev);
drivers/soc/amlogic/meson-mx-socinfo.c: 
dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
drivers/soc/imx/soc-imx8.c:     ret = 
device_create_file(soc_device_to_device(soc_dev),
drivers/soc/imx/soc-imx-scu.c:  ret = 
device_create_file(soc_device_to_device(soc_dev),
drivers/soc/versatile/soc-realview.c:   
device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
drivers/soc/versatile/soc-realview.c:   
device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
drivers/soc/versatile/soc-realview.c:   
device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
drivers/soc/versatile/soc-realview.c:   
device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);
drivers/soc/versatile/soc-integrator.c: dev = 
soc_device_to_device(soc_dev);

These drivers can use the current proposed approach to expose their 
sysfs entries.
Will try to address these and submit. But i can't able to test these 
changes because i do not have these h/w's

> thanks,
> 
> greg k-h