linux-kernel - Re: [PATCH v2 00/25] Add generic support for composing LED class device name

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Message-ID: <20190328001930.GA22901@bogus>
Date:   Wed, 27 Mar 2019 19:19:30 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, pavel@....cz
Subject: Re: [PATCH v2 00/25] Add generic support for composing LED class
 device name

On Sun, Mar 10, 2019 at 07:28:11PM +0100, Jacek Anaszewski wrote:
> Changes from v1:
> 
> - improved led_parse_properties() to parse label property at first
>   and return immediately after parsing succeeds
> - added tool get_led_device_info.sh for retrieving LED class device's
>   parent device related information
> - extended LED naming section of Documentation/leds/leds-class.txt
> - adjusted the list of LED_FUNCTION definitions according to the v1 review
>   remarks
> - added standard LED_COLOR_NAME definitions
> - removed functions.h and moved both LED_FUNCTION and LED_COLOR_NAME
>   definitions to include/dt-bindings/common.h
> - rebased leds-as3645a changes on top of the patch switching to fwnode
>   property API
> - updated DT bindings to use new LED_COLOR_NAME definitions
> - improved common LED bindings to not use address unit for sub-nodes
>   without reg property
> 
> Generally I still insist on deprecating label property and devicename
> section of LED name. The tool I added for obtaining LED device name
> proves availability of the related information in other places in
> the sysfs. Other discussed use cases are covered in the updated
> Documentation/leds/leds-class.txt.
> 
> Beside that, I tried also to create macros for automatic composition
> of "-N" suffixed LED functions, so that it would not be necessary
> to pollute common.h with plenty repetitions of the same function,
> differing only with the postfix. Unfortunately, the preprocessor
> of the dtc compiler seems not to accept string concatenetation.
> I.e. it is not possible to to the following assighment:
> 
> function = "hdd""-1"
> 
> If anyone knows how to obviate this shortocoming please let me know.

Raise the question on devicetree-compiler list. I've done my share of 
dtc patches, but the parsing side is generally not an area I touch.

Rob