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See DM3730,DM275 data sheet (SPRS685B) footnote (6) in Table 4-19 which says that ABB must be switched to FBB mode when using the OPP1G. The LOD definition abb_mpu_iva already exists so that we need to add plumbing for vbb-supply = <&abb_mpu_iva> and define two voltage vectors for each OPP so that the abb LDO is also updated by the ti-cpufreq driver. We also must switch the ti_cpufreq_soc_data to multi_regulator. Note: reading out the abb reglator voltage to verify that it does do transitions can be done by cat /sys/devices/platform/68000000.ocp/483072f0.regulator-abb-mpu/regulator/regulator.*/microvolts Likewise, read the twl4030 provided VDD voltage by cat /sys/devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:regulator-vdd1/regulator/regulator.*/microvolts Note: to check if the ABB FBB is enabled/disabled, check registers PRM_LDO_ABB_CTRL 0x483072F4 bit 3:0 1=bypass 5=FBB PRM_LDO_ABB_SETUP 0x483072F0 0x00=bypass 0x11=FBB e.g. /dev/mem opened. Memory mapped at address 0xb6fe4000. Value at address 0x483072F4 (0xb6fe42f4): 0x3205 /dev/mem opened. Memory mapped at address 0xb6f89000. Value at address 0x483072F4 (0xb6f892f4): 0x3201 Note: omap34xx and am3517 have/need no comparable LDO or mechanism. Suggested-by: Adam Ford <aford173@gmail.com> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Acked-by: Tony Lindgren <tony@atomide.com> Tested-by: Adam Ford <aford173@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.