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Subject: Re: [PATCH v8 7/9] dt: bindings: lp50xx: Introduce the lp50xx family
 of RGB drivers
To:     Dan Murphy <dmurphy@ti.com>, pavel@ucw.cz
Cc:     linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org,
        Rob Herring <robh+dt@kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
References: <20190920174139.30079-1-dmurphy@ti.com>
 <20190920174139.30079-8-dmurphy@ti.com>
 <73a95bac-7433-5b06-5701-c742307aa004@gmail.com>
 <ba92d95a-9f2c-6b37-74d3-4e3a87ad28bf@ti.com>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
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Message-ID: <6788e600-460a-7846-04d0-480268e674a1@gmail.com>
Date:   Mon, 23 Sep 2019 23:42:02 +0200
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In-Reply-To: <ba92d95a-9f2c-6b37-74d3-4e3a87ad28bf@ti.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Dan,

On 9/23/19 5:28 PM, Dan Murphy wrote:
> Jacek
> 
> On 9/21/19 10:13 AM, Jacek Anaszewski wrote:
>> Dan,
>>
>> On 9/20/19 7:41 PM, Dan Murphy wrote:
>>> Introduce the bindings for the Texas Instruments LP5036, LP5030, LP5024,
>>> LP5018, LP5012 and LP5009 RGB LED device driver.  The
>>> LP5036/30/24/18/12/9
>>> can control RGB LEDs individually or as part of a control bank group.
>>> These devices have the ability to adjust the mixing control for the RGB
>>> LEDs to obtain different colors independent of the overall brightness of
>>> the LED grouping.
>>>
>>> Datasheet:
>>> http://www.ti.com/lit/ds/symlink/lp5012.pdf
>>> http://www.ti.com/lit/ds/symlink/lp5024.pdf
>>> http://www.ti.com/lit/ds/symlink/lp5036.pdf
>>>
>>> Signed-off-by: Dan Murphy <dmurphy@ti.com>
>>> ---
>>>   .../devicetree/bindings/leds/leds-lp50xx.txt  | 148 ++++++++++++++++++
>>>   1 file changed, 148 insertions(+)
>>>   create mode 100644
>>> Documentation/devicetree/bindings/leds/leds-lp50xx.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/leds/leds-lp50xx.txt
>>> b/Documentation/devicetree/bindings/leds/leds-lp50xx.txt
>>> new file mode 100644
>>> index 000000000000..9d05f43042e0
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/leds/leds-lp50xx.txt
>>> @@ -0,0 +1,148 @@
>>> +* Texas Instruments - LP5009/12/18/24/30/36 RGB LED driver
>>> +
>>> +The LP50XX is multi-channel, I2C RGB LED Drivers that can group RGB
>>> LEDs into
>>> +a LED group or control them individually.
>>> +
>>> +The difference in these RGB LED drivers is the number of supported
>>> RGB modules.
>>> +
>>> +Required parent properties:
>>> +    - compatible:
>>> +        "ti,lp5009"
>>> +        "ti,lp5012"
>>> +        "ti,lp5018"
>>> +        "ti,lp5024"
>>> +        "ti,lp5030"
>>> +        "ti,lp5036"
>>> +    - reg :  I2C slave address
>>> +        lp5009/12 - 0x28
>>> +        lp5018/24 - 0x28
>>> +        lp5030/36 - 0x30
>>> +    - #address-cells : 1
>>> +    - #size-cells : 0
>>> +
>>> +Optional parent properties:
>>> +    - enable-gpios : gpio pin to enable/disable the device.
>>> +    - vled-supply : LED supply
>>> +
>>> +Required child properties:
>>> +    - #address-cells : 1
>>> +    - #size-cells : 0
>>> +    - reg : This is the LED module number.
>>> +    - color : see Documentation/devicetree/bindings/leds/common.txt
>>> +    - function : see Documentation/devicetree/bindings/leds/common.txt
>>> +
>>> +Required child properties only is LED modules will be banked:
>>> +    - ti,led-bank : This property denotes the LED module numbers
>>> that will
>>> +            be controlled as a single RGB cluster.  Each LED module
>>> +            number will be controlled by a single LED class instance.
>>> +            There can only be one instance of the ti,led-bank
>>> +            property for each device node.
>>> +
>>> +Required grandchildren properties:
>>> +    - reg : A single entry denoting the LED module that controls
>>> +        the RGB cluster.
>>> +    - color : see
>>> Documentation/devicetree/bindings/leds/leds-multicolor.txt
>>> +    - led-sources : see
>>> Documentation/devicetree/bindings/leds/common.txt
>>> +
>>> +The LED outputs associated with the LED modules are defined in Table
>>> 1 of the
>>> +corresponding data sheets.
>> We must enclose this information here.
> 
> That will make this doc pretty messy especially with the LP5036 entries.
> 
> I would have to do ascii art to make it understandable and basically
> there is not a delta in the lesser devices in the outputs
> 
> I don't see value in reproducing this data sheet contents in the
> dt-bindings.

IMO DT bindings should be self-contained. We cannot assume that
user will always have Internet access.

> For example (LP5012) and then for the LP5036 multiply this by 3
> 
> Table 1.
> 
> Bank Number and LED Number Assignment
> OUT NUMBER BANK NUMBER  RGB LED MODULE NUMBER
> OUT0                    Bank A
> OUT1                    Bank B                        LED0
> OUT2                    Bank C
> 
> OUT3                    Bank A
> OUT4                    Bank B                        LED1
> OUT5                    Bank C
> 
> OUT6                    Bank A
> OUT7                    Bank B                        LED2
> OUT8                    Bank C
> 
> OUT9 (LP5012 only) Bank A
> OUT10 (LP5012 only) Bank B                  LED3
> OUT11 (LP5012 only) Bank C


I'd say it is required. But let's wait for DT guys' opinion.


>>> +
>>> +LP5009 - 2 Total RGB cluster LED outputs 0-1
> 
> This should be 3 total not 2
> 
> Dan
> 
>>> +LP5012 - 4 Total RGB cluster LED outputs 0-3
>>> +LP5018 - 6 Total RGB cluster LED outputs 0-5
>>> +LP5024 - 8 Total RGB cluster LED outputs 0-7
>>> +LP5030 - 10 Total RGB cluster LED outputs 0-9
>>> +LP5036 - 12 Total RGB cluster LED outputs 0-11
>>> +
>>> +Optional child properties:
>>> +    - label : see Documentation/devicetree/bindings/leds/common.txt
>>> +    - linux,default-trigger :
>>> +       see Documentation/devicetree/bindings/leds/common.txt
>>> +
>>> +Examples:
>>> +led-controller@29 {
>>> +    #address-cells = <1>;
>>> +    #size-cells = <0>;
>>> +    compatible = "ti,lp5024";
>>> +    reg = <0x29>;
>>> +    enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
>>> +    vled-supply = <&vmmcsd_fixed>;
>>> +
>>> +    multi-led@1 {
>>> +        #address-cells = <1>;
>>> +        #size-cells = <0>;
>>> +        reg = <1>;
>>> +        color = <LED_COLOR_ID_MULTI>;
>>> +        function = LED_FUNCTION_STATUS;
>>> +
>>> +        led@3 {
>>> +            reg = <3>;
>>> +            color = <LED_COLOR_ID_RED>;
>>> +        };
>>> +
>>> +        led@4 {
>>> +            reg = <4>;
>>> +            color = <LED_COLOR_ID_GREEN>;
>>> +        };
>>> +
>>> +        led@5 {
>>> +            reg = <5>;
>>> +            color = <LED_COLOR_ID_BLUE>;
>>> +        };
>>> +    };
>>> +
>>> +    multi-led@2 {
>>> +        #address-cells = <1>;
>>> +        #size-cells = <0>;
>>> +        reg = <2>;
>>> +        color = <LED_COLOR_ID_MULTI>;
>>> +        function = LED_FUNCTION_STANDBY;
>>> +        ti,led-bank = <2 3 5>;
>>> +
>>> +        led@6 {
>>> +            reg = <0x6>;
>>> +            color = <LED_COLOR_ID_RED>;
>>> +            led-sources = <6 9 15>;
>>> +        };
>>> +
>>> +        led@7 {
>>> +            reg = <0x7>;
>>> +            color = <LED_COLOR_ID_GREEN>;
>>> +            led-sources = <7 10 16>;
>>> +        };
>>> +
>>> +        led@8 {
>>> +            reg = <0x8>;
>>> +            color = <LED_COLOR_ID_BLUE>;
>>> +            led-sources = <8 11 17>;
>>> +        };
>>> +    };
>>> +
>>> +    multi-led@4 {
>>> +        #address-cells = <1>;
>>> +        #size-cells = <0>;
>>> +        reg = <4>;
>>> +        color = <LED_COLOR_ID_MULTI>;
>>> +        function = LED_FUNCTION_ACTIVITY;
>>> +
>>> +        led@12 {
>>> +            reg = <12>;
>>> +            color = <LED_COLOR_ID_RED>;
>>> +        };
>>> +
>>> +        led@13 {
>>> +            reg = <13>;
>>> +            color = <LED_COLOR_ID_GREEN>;
>>> +        };
>>> +
>>> +        led@14 {
>>> +            reg = <14>;
>>> +            color = <LED_COLOR_ID_BLUE>;
>>> +        };
>>> +    };
>>> +};
>>> +
>>> +For more product information please see the link below:
>>> +http://www.ti.com/lit/ds/symlink/lp5012.pdf
>>> +http://www.ti.com/lit/ds/symlink/lp5024.pdf
>>> +http://www.ti.com/lit/ds/symlink/lp5036.pdf
>>>
> 

-- 
Best regards,
Jacek Anaszewski