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On imx6sx accessing OCOTP directly is wrong because the ocotp clock needs to be enabled first. Use the nvmem-cells binding instead. This requirement does not apply to older imx6qdl chips because there the ocotp access clock (clk_ipg_s) is always enabled. This is visible by comparing the "System Clocks, Gating, and Override" tables (OCOTP rows) in the 6DQ and 6SX manuals: http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6SXRM.pdf http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6DQRM.pdf This happens to work right now because the ocotp clock might be enabled for some other reason. In particular the it might be enabled from the bootloader and it only gets disabled late during boot in clk_disable_unused, after imx-thermal has completed probing. If imx-thermal is compiled as a module then the system can hang on probe. Reported-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Signed-off-by: Shawn Guo <shawnguo@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.