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The Qualcomm PM8xxx PMICs contain a simpler ADC than its successors (already in the kernel as qcom-spmi-vadc.c): the HK/XO ADC (Housekeeping/Chrystal oscillator ADC). As far as I can understand this is equal to the PMICs using SSBI transport and encompass PM8018, PM8038, PM8058, and PM8921, so this is shortly named PM8xxx. This ADC monitors a bunch of on-board voltages and the die temperature of the PMIC itself, but it can also be routed to convert a few external MPPs (multi-purpose pins). On the APQ8060 DragonBoard this feature is used to let this ADC convert an analog ALS (Ambient Light Sensor) voltage signal from a Capella CM3605 ALS into a LUX value. Developed and tested with APQ8060 DragonBoard based on Ivan's driver and Rama Krishna's patches. The SPMI VADC driver is quite different, but share enough minor functionality that I have split out to the common file in a previous patch. Cc: linux-arm-kernel@lists.infradead.org Cc: linux-arm-msm@vger.kernel.org Cc: Ivan T. Ivanov <iivanov.xz@gmail.com> Cc: Andy Gross <andy.gross@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Rama Krishna Phani A <rphani@codeaurora.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.