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Date: Thu, 11 Apr 2019 21:48:19 +0200
From: Jacek Anaszewski <jacek.anaszewski@...il.com>
To: Dan Murphy <dmurphy@...com>, robh+dt@...nel.org, pavel@....cz,
lee.jones@...aro.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org
Subject: Re: [PATCH v2 4/6] dt-bindings: ti-lmu: Modify dt bindings for the
LM3697
Hi Rob,
I've collected references to the DT patches we're waiting
to be reviewed. This is just to make sure that none of them
will be missed - recent traffic on the linux-leds list
is a bit heavier.
[0] - draft of LED multi color class - we would especially like
to get a feedback on the proposed brightness-model DT design
[1][2] - LM3697 backlight driver rework
[3][4] - LM36274 backlight driver with regulator support
On 4/5/19 4:28 PM, Dan Murphy wrote:
> The LM3697 is a single function LED driver. The single function LED
> driver needs to reside in the LED directory as a dedicated LED driver
> and not as a MFD device. The device does have common brightness and ramp
> features and those can be accomodated by a TI LMU framework.
>
> The LM3697 dt binding needs to be moved from the ti-lmu.txt and a dedicated
> LED dt binding needs to be added. The new LM3697 LED dt binding will then
> reside in the Documentation/devicetree/bindings/leds directory and follow the
> current LED and general bindings guidelines.
>
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>
> v2 - Made changes to reference ti,brightness-resolution to the ti-lmu.txt -
> https://lore.kernel.org/patchwork/patch/1054501/
>
> .../devicetree/bindings/leds/leds-lm3697.txt | 73 +++++++++++++++++++
> .../devicetree/bindings/mfd/ti-lmu.txt | 27 +------
> 2 files changed, 74 insertions(+), 26 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-lm3697.txt b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
> new file mode 100644
> index 000000000000..02378f33c9ab
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
> @@ -0,0 +1,73 @@
> +* Texas Instruments - LM3697 Highly Efficient White LED Driver
> +
> +The LM3697 11-bit LED driver provides high-
> +performance backlight dimming for 1, 2, or 3 series
> +LED strings while delivering up to 90% efficiency.
> +
> +This device is suitable for display and keypad Lighting
> +
> +Required properties:
> + - compatible:
> + "ti,lm3697"
> + - reg : I2C slave address
> + - #address-cells : 1
> + - #size-cells : 0
> +
> +Optional properties:
> + - enable-gpios : GPIO pin to enable/disable the device
> + - vled-supply : LED supply
> +
> +Required child properties:
> + - reg : 0 - LED is Controlled by bank A
> + 1 - LED is Controlled by bank B
> + - led-sources : Indicates which HVLED string is associated to which
> + control bank. This is a zero based property so
> + HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
> + Additional information is contained
> + in Documentation/devicetree/bindings/leds/common.txt
> +
> +Optional child properties:
> + - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
> + - ramp-up-ms: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
> + - ramp-down-ms: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
> + - label : see Documentation/devicetree/bindings/leds/common.txt
> + - linux,default-trigger :
> + see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
> +controlled by control bank B.
> +
> +led-controller@36 {
> + compatible = "ti,lm3697";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <0x36>;
> +
> + enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
> + vled-supply = <&vbatt>;
> +
> + led@0 {
> + reg = <0>;
> + led-sources = <0 2>;
> + ti,brightness-resolution = <2047>;
> + ramp-up-ms = <5000>;
> + ramp-down-ms = <1000>;
> + label = "white:first_backlight_cluster";
> + linux,default-trigger = "backlight";
> + };
> +
> + led@1 {
> + reg = <1>;
> + led-sources = <1>;
> + ti,brightness-resolution = <255>;
> + ramp-up-ms = <500>;
> + ramp-down-ms = <1000>;
> + label = "white:second_backlight_cluster";
> + linux,default-trigger = "backlight";
> + };
> +}
> +
> +For more product information please see the link below:
> +http://www.ti.com/lit/ds/symlink/lm3697.pdf
> diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
> index 5881929d5f7a..a948a8f41b2c 100644
> --- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
> +++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
> @@ -8,7 +8,6 @@ TI LMU driver supports lighting devices below.
> LM3632 Backlight and regulator
> LM3633 Backlight, LED and fault monitor
> LM3695 Backlight
> - LM3697 Backlight and fault monitor
>
> Required properties:
> - compatible: Should be one of:
> @@ -16,11 +15,10 @@ Required properties:
> "ti,lm3632"
> "ti,lm3633"
> "ti,lm3695"
> - "ti,lm3697"
> - reg: I2C slave address.
> 0x11 for LM3632
> 0x29 for LM3631
> - 0x36 for LM3633, LM3697
> + 0x36 for LM3633
> 0x63 for LM3695
>
> Optional property:
> @@ -51,7 +49,6 @@ Optional nodes:
> Required properties:
> - compatible: Should be one of:
> "ti,lm3633-fault-monitor"
> - "ti,lm3697-fault-monitor"
> - leds: LED properties for LM3633. Please refer to [2].
> - regulators: Regulator properties for LM3631 and LM3632.
> Please refer to [3].
> @@ -216,25 +213,3 @@ lm3695@63 {
> };
> };
> };
> -
> -lm3697@36 {
> - compatible = "ti,lm3697";
> - reg = <0x36>;
> -
> - enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
> -
> - backlight {
> - compatible = "ti,lm3697-backlight";
> -
> - lcd {
> - ti,brightness-resolution = <255>;
> - led-sources = <0 1 2>;
> - ramp-up-ms = <200>;
> - ramp-down-ms = <200>;
> - };
> - };
> -
> - fault-monitor {
> - compatible = "ti,lm3697-fault-monitor";
> - };
> -};
>
[0] https://marc.info/?l=linux-kernel&m=155414072611538&w=2
[1] https://marc.info/?l=devicetree&m=155447454524411&w=2
[2] https://lore.kernel.org/patchwork/patch/1058762/
[3] https://marc.info/?l=devicetree&m=155447624324995&w=2
[4] https://lore.kernel.org/patchwork/patch/1058779/
--
Best regards,
Jacek Anaszewski
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