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Date: Thu, 12 Sep 2013 10:41:10 +0900
From: Milo Kim <milo.kim@...com>
To: Lee Jones <lee.jones@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/4] Documentation: add LP3943 DT bindings and document
Hi Everyone,
Please ignore this mail. Version information, 'v3' is missing in the
subject.
Fixed mail has just sent. Please find '[PATCH v3 4/4]' in your mailbox.
Sorry for the inconvenience.
Best regards,
Milo
On 09/12/2013 10:34 AM, Milo Kim wrote:
> Bindings for LP3943 MFD, GPIO and PWM controller are added.
> And LP3943 driver document is added also.
>
> Cc: devicetree@...r.kernel.org
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Signed-off-by: Milo Kim <milo.kim@...com>
> ---
> Documentation/00-INDEX | 2 +
> .../devicetree/bindings/gpio/gpio-lp3943.txt | 37 ++++++++++++
> Documentation/devicetree/bindings/mfd/lp3943.txt | 33 +++++++++++
> .../devicetree/bindings/pwm/pwm-lp3943.txt | 58 ++++++++++++++++++
> Documentation/lp3943.txt | 62 ++++++++++++++++++++
> 5 files changed, 192 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-lp3943.txt
> create mode 100644 Documentation/devicetree/bindings/mfd/lp3943.txt
> create mode 100644 Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
> create mode 100644 Documentation/lp3943.txt
>
> diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
> index 0c4cc68..5dd921f 100644
> --- a/Documentation/00-INDEX
> +++ b/Documentation/00-INDEX
> @@ -285,6 +285,8 @@ logo.gif
> - full colour GIF image of Linux logo (penguin - Tux).
> logo.txt
> - info on creator of above logo & site to get additional images from.
> +lp3943.txt
> + - info on LP3943 MFD driver structure.
> m68k/
> - directory with info about Linux on Motorola 68k architecture.
> magic-number.txt
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-lp3943.txt b/Documentation/devicetree/bindings/gpio/gpio-lp3943.txt
> new file mode 100644
> index 0000000..80fcb7d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-lp3943.txt
> @@ -0,0 +1,37 @@
> +TI/National Semiconductor LP3943 GPIO controller
> +
> +Required properties:
> + - compatible: "ti,lp3943-gpio"
> + - gpio-controller: Marks the device node as a GPIO controller.
> + - #gpio-cells: Should be 2. See gpio.txt in this directory for a
> + description of the cells format.
> +
> +Example:
> +Simple LED controls with LP3943 GPIO controller
> +
> +&i2c4 {
> + lp3943@60 {
> + compatible = "ti,lp3943";
> + reg = <0x60>;
> +
> + gpioex: gpio {
> + compatible = "ti,lp3943-gpio";
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
> + };
> +};
> +
> +leds {
> + compatible = "gpio-leds";
> + indicator1 {
> + label = "indi1";
> + gpios = <&gpioex 9 GPIO_ACTIVE_LOW>;
> + };
> +
> + indicator2 {
> + label = "indi2";
> + gpios = <&gpioex 10 GPIO_ACTIVE_LOW>;
> + default-state = "off";
> + };
> +};
> diff --git a/Documentation/devicetree/bindings/mfd/lp3943.txt b/Documentation/devicetree/bindings/mfd/lp3943.txt
> new file mode 100644
> index 0000000..e8591d6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/lp3943.txt
> @@ -0,0 +1,33 @@
> +TI/National Semiconductor LP3943 MFD driver
> +
> +Required properties:
> + - compatible: "ti,lp3943"
> + - reg: I2C slave address. From 0x60 to 0x67.
> +
> +LP3943 consists of two sub-devices, lp3943-gpio and lp3943-pwm.
> +
> +For the LP3943 GPIO properties please refer to:
> +Documentation/devicetree/bindings/gpio/gpio-lp3943.txt
> +
> +For the LP3943 PWM properties please refer to:
> +Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
> +
> +Example:
> +
> +lp3943@60 {
> + compatible = "ti,lp3943";
> + reg = <0x60>;
> +
> + gpioex: gpio {
> + compatible = "ti,lp3943-gpio";
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
> +
> + pwm3943: pwm {
> + compatible = "ti,lp3943-pwm";
> + #pwm-cells = <2>;
> + ti,pwm0 = <8 9 10>;
> + ti,pwm1 = <15>;
> + };
> +};
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt b/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
> new file mode 100644
> index 0000000..7bd9d3b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
> @@ -0,0 +1,58 @@
> +TI/National Semiconductor LP3943 PWM controller
> +
> +Required properties:
> + - compatible: "ti,lp3943-pwm"
> + - #pwm-cells: Should be 2. See pwm.txt in this directory for a
> + description of the cells format.
> + Note that this hardware limits the period length to the
> + range 6250~1600000.
> + - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
> + 0 = output 0
> + 1 = output 1
> + .
> + .
> + 15 = output 15
> +
> +Example:
> +PWM 0 is for RGB LED brightness control
> +PWM 1 is for brightness control of LP8557 backlight device
> +
> +&i2c3 {
> + lp3943@60 {
> + compatible = "ti,lp3943";
> + reg = <0x60>;
> +
> + /*
> + * PWM 0 : output 8, 9 and 10
> + * PWM 1 : output 15
> + */
> + pwm3943: pwm {
> + compatible = "ti,lp3943-pwm";
> + #pwm-cells = <2>;
> + ti,pwm0 = <8 9 10>;
> + ti,pwm1 = <15>;
> + };
> + };
> +
> +};
> +
> +/* LEDs control with PWM 0 of LP3943 */
> +pwmleds {
> + compatible = "pwm-leds";
> + rgb {
> + label = "indi::rgb";
> + pwms = <&pwm3943 0 10000>;
> + max-brightness = <255>;
> + };
> +};
> +
> +&i2c4 {
> + /* Backlight control with PWM 1 of LP3943 */
> + backlight@2c {
> + compatible = "ti,lp8557";
> + reg = <0x2c>;
> +
> + pwms = <&pwm3943 1 10000>;
> + pwm-names = "lp8557";
> + };
> +};
> diff --git a/Documentation/lp3943.txt b/Documentation/lp3943.txt
> new file mode 100644
> index 0000000..576ebd0
> --- /dev/null
> +++ b/Documentation/lp3943.txt
> @@ -0,0 +1,62 @@
> +TI/National Semiconductor LP3943 MFD driver
> +===========================================
> +
> +LP3943 is an integrated device capable of driving 16 output channels.
> +It can be used for GPIO expander and PWM generators.
> +LP3493 registers are controlled via the I2C interface.
> +
> +Driver structure
> +----------------
> + LED control General usage for a device
> + ___________ ____________________________
> +
> + LP3943 MFD ---- GPIO expander leds-gpio eg) HW enable pin
> + |
> + --- PWM generator leds-pwm eg) PWM input
> +
> +
> +Why do we need GPIO and PWM drivers instead of LED driver?
> +To support LED control and general usage, GPIO and PWM drivers are necessary.
> +
> +According to the datasheet(1), it's just a LED driver which has 16 channels.
> +But here is another application, a GPIO expander.(2)
> +
> + (1) http://www.ti.com/lit/ds/snvs256b/snvs256b.pdf
> + (2) http://www.ti.com/lit/an/snva287a/snva287a.pdf
> +
> +Internal two PWM channels are used for LED dimming effect.
> +And each output pin can be used as a GPIO as well.
> +LED functionality can work with GPIOs or PWMs.
> +LEDs can be controlled with legacy leds-gpio(static brightness) or
> +leds-pwm drivers(dynamic brightness control).
> +Additionally, it can be used for generic GPIO and PWM controller.
> +For example, a GPIO is HW enable pin of a device.
> +PWM is input pin of a backlight device.
> +
> +
> +LP3943 PWM port map
> +-------------------
> +Each PWM channel can be mapped to one or multiple output pins.
> +
> +For example, PWM 0 is used for a backlight device.
> +PWM 1 is for RGB LEDs.
> +
> + PWM channel Output pins PWM consumer
> + ___________ ___________ ____________
> + PWM 0 pin 1 backlight
> + PWM 1 pin 7, 8, 9 RGB LEDs
> +
> +Then, PWM port map is as below.
> +PWM 0: num_outputs = 1, output = pin 1
> +PWM 1: num_outputs = 3, output = pin 7, 8, 9
> +
> +The 'lp3943_pwm_map' structure is used for this feature.
> +
> +
> +Device tree supported
> +---------------------
> +Please refer to the documents below.
> +
> +Documentation/devicetree/bindings/mfd/lp3943.txt
> +Documentation/devicetree/bindings/gpio/gpio-lp3943.txt
> +Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
>
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