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Message-Id: <1409223709-23671-1-git-send-email-jack.yoo@skyworksinc.com> Date: Thu, 28 Aug 2014 20:01:49 +0900 From: Gyungoh Yoo <gyungoh@...il.com> To: rdunlap@...radead.org Cc: jack.yoo@...worksinc.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH v2 7/7] Adding SKY81452 backlight document v2: split the patches --- Documentation/backlight/sky81452-backlight.txt | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 Documentation/backlight/sky81452-backlight.txt diff --git a/Documentation/backlight/sky81452-backlight.txt b/Documentation/backlight/sky81452-backlight.txt new file mode 100644 index 0000000..39f2f8c --- /dev/null +++ b/Documentation/backlight/sky81452-backlight.txt @@ -0,0 +1,26 @@ +backlight driver for sky81452 +========================== + +* Skyworks Solutions SKY81452 : + High-Efficiency, Six-Channel White LED Driver with Touch Panel Bias Supply + +Description +----------- +The SKY81452 is a highly integrated, high-efficiency LED backlight solution for +tablets, notebook computers, monitors, and other portable devices. + +The SKY81452 supports Direct Pulse Width Modulation(DPWM) dimming and Analog +Pulse Width Modulation (APWM). In the DPWM dimming mode, the output waveform +follows the Pulse Width Modulation Input(PWMI) signal and the current level is +set by I2C control and an external RSET resistor. In the APWM mode, the PWMI +signal duty and the I2C brightness control signal are multiplied to control +the output current level. + +The driver exports some additional attributes for SKY81452 backlight. +- enable : Current sink channels. Bit0 is for channel 1, Bit1 is for channel 2 + and Bit2 is for channel 3. In same way, Bit5 is for channel 6. + For example, if 5 is written to this attribute, channel 1 and + channel 3 are enabled. +- open : Shows an open LED fault. +- short : Shows an short LED fault. +- fault : Shows information about over-current and over-temperature. -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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