The Meson8/Meson8b/Meson8m2 SoCs are suffering from a similar problem as the GXBB/GXL/GXM SoCs (see the GX series from Jerome: [0]): There is a register area called "HHI" which is used for multiple IP blocks of the SoC: - the system clock controller - a few reset lines (there is a separate reset controller, these reset lines are not part of the other reset controller). this reset controller is currently implemented in the clock controller driver - a HDMI controller - temperature sensor calibration data (by "data" I really mean data, the ADC driver has four bits for the TSC data in it's own register space, however on Meson8b and Meson8m2 there is a fifth TSC bit which is stored in the HHI register area) The first three could be implemented with a single node (either in one big driver, or using a MFD driver which would register function- specific drivers). However, the TSC data is a big problem, because the ADC has it's own set of registers but needs to write one bit in the HHI register area. NOTE: this series has multiple dependencies: - the clock controller changes depend "meson8b: add the CPU_DIV16 clock for the ARM TWD" as well as "meson8b: register the clock controller early" [2] - the dts changes depend on "fix clock controller register size on Meson8/Meson8b" [3] Changes since v1 at [4]: - added a "amlogic,meson-hhi-sysctrl" compatible to the syscon node (which is the parent of the clock controller) in patch #1 and #3 - added Neil's Acked-by - rebased on top of clk-meson's meson-clk-4.20-1 tag and my other series "Meson8b: fixes for the cpu_scale_div clock" from [5] [0] http://lists.infradead.org/pipermail/linux-amlogic/2018-March/006733.html [1] http://lists.infradead.org/pipermail/linux-amlogic/2018-July/007890.html [2] http://lists.infradead.org/pipermail/linux-amlogic/2018-July/007900.html [3] http://lists.infradead.org/pipermail/linux-amlogic/2018-July/007897.html [4] https://patchwork.kernel.org/cover/10539051/ [5] https://patchwork.kernel.org/cover/10617617/ Martin Blumenstingl (3): dt-bindings: clock: meson8b: use the registers from the HHI syscon clk: meson: meson8b: use the HHI syscon if available ARM: dts: meson: switch the clock controller to the HHI register area .../bindings/clock/amlogic,meson8b-clkc.txt | 13 ++++------ arch/arm/boot/dts/meson.dtsi | 7 ++++++ arch/arm/boot/dts/meson8.dtsi | 15 ++++++------ arch/arm/boot/dts/meson8b.dtsi | 15 ++++++------ drivers/clk/meson/meson8b.c | 24 ++++++++++++------- 5 files changed, 43 insertions(+), 31 deletions(-) -- 2.19.1
