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This is a rebased version of patch [0]. The 32 kHz reference clock on the i.MX6UL(L) can be output by setting the external signal XTALOSC_REF_CLK_32K in one of the following ways [1]: |----------------------------------------------------------| | Signal | Pad | Mode | Direction | |----------------------------------------------------------| | XTALOSC_REF_CLK_32K | ENET1_RX_EN | ALT2 | O | | | GPIO1_IO03 | ALT3 | | | | JTAG_TCK | ALT6 | | |----------------------------------------------------------| Before patch [2] the mux mode for the external reference clock was missing. The patch named the mux mode as used in the NXP Linux 4.9.11_1.0.0 release, but the Reference Manual uses the name OSC32K_32K_OUT, e.g. in [3]. As Philipp and Shawn suggest the name from the RM should be used instead. [0] https://patchwork.kernel.org/patch/10172187/ [1] IMX6ULRM, Rev. 1, 04/2016, Table 58-1, p. 3649 [2] https://patchwork.kernel.org/patch/10156121/ [3] IMX6ULRM, Rev. 1, 04/2016, 30.5.47 SW_MUX_CTL_PAD_ENET1_RX_EN SW MUX Control Register (IOMUXC_SW_MUX_CTL_PAD_ENET1_RX_EN), p. 1357 Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks> Reviewed-by: Stefan Agner <stefan@agner.ch> 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.