linux-dev/drivers/clk/sunxi-ng/Kconfig, branch master

clk: sunxi-ng: Add support for the sun6i RTC clocks

2022-03-23T18:58:38Z

The RTC power domain in sun6i and newer SoCs manages the 16 MHz RC oscillator (called "IOSC" or "osc16M") and the optional 32 kHz crystal oscillator (called "LOSC" or "osc32k"). Starting with the H6, this power domain also handles the 24 MHz DCXO (called variously "HOSC", "dcxo24M", or "osc24M") as well. The H6 also adds a calibration circuit for IOSC. Later SoCs introduce further variations on the design: - H616 adds an additional mux for the 32 kHz fanout source. - R329 adds an additional mux for the RTC timekeeping clock, a clock for the SPI bus between power domains inside the RTC, and removes the IOSC calibration functionality. Take advantage of the CCU framework to handle this increased complexity. This driver is intended to be a drop-in replacement for the existing RTC clock provider. So some runtime adjustment of the clock parents is needed, both to handle hardware differences, and to support the old binding which omitted some of the input clocks. Signed-off-by: Samuel Holland Acked-by: Stephen Boyd Signed-off-by: Alexandre Belloni Link: https://lore.kernel.org/r/20220203021736.13434-6-samuel@sholland.org

clk: sunxi-ng: Add support for the D1 SoC clocks

2021-11-23T09:29:05Z

The D1 SoC contains a CCU and a R_CCU (PRCM CCU). Add support for them. Signed-off-by: Samuel Holland Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20211119043545.4010-7-samuel@sholland.org

clk: sunxi-ng: Allow the CCU core to be built as a module

2021-11-23T09:29:05Z

Like the individual CCU drivers, it can be beneficial for memory consumption of cross-platform configurations to only load the CCU core on the relevant platform. For example, a generic arm64 kernel sees the following improvement when building the CCU core and drivers as modules: before: text data bss dec hex filename 13882360 5251670 360800 19494830 12977ae vmlinux after: text data bss dec hex filename 13734787 5086442 360800 19182029 124b1cd vmlinux So the result is a 390KB total reduction in kernel image size. The one early clock provider (sun5i) requires the core to be built in. Now that loading the MMC driver will trigger loading the CCU core, the MMC timing mode functions do not need a compile-time fallback. Signed-off-by: Samuel Holland Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20211119033338.25486-5-samuel@sholland.org

clk: sunxi-ng: Convert early providers to platform drivers

2021-11-23T09:29:05Z

The PRCM CCU drivers depend on clocks provided by other CCU drivers. For example, the sun8i-r-ccu driver uses the "pll-periph" clock provided by the SoC's main CCU. However, sun8i-r-ccu is an early OF clock provider, and many of the main CCUs (e.g. sun50i-a64-ccu) use platform drivers. This means that the consumer clocks will be orphaned until the supplier driver is bound. This can be avoided by converting the remaining CCUs to use platform drivers. Then fw_devlink will ensure the drivers are bound in the optimal order. The sun5i CCU is the only one which actually needs to be an early clock provider, because it provides the clock for the system timer. That one is left alone. Signed-off-by: Samuel Holland Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20211119033338.25486-4-samuel@sholland.org

clk: sunxi-ng: Allow drivers to be built as modules

2021-11-22T09:02:21Z

While it is useful to build all of the CCU drivers at once, only 1-3 of them will be loaded at a time, or possibly none of them if the kernel is booted on a non-sunxi platform. These CCU drivers are relatively large; 32-bit drivers have 30-50k of data each, while the 64-bit ones are 50-75k due to the increased pointer overhead. About half of that data comes from relocations. Let's allow the user to build these drivers as modules so only the necessary data is loaded. As a first step, convert the CCUs that are already platform drivers. When the drivers are built as modules, normally the file name becomes the module name. However, the current file names are inconsistent with the - name used everywhere else: the devicetree bindings, the platform driver names, and the Kconfig symbols. Use Makfile logic to rename the modules so they follow the usual pattern. Signed-off-by: Samuel Holland Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20211119033338.25486-3-samuel@sholland.org

clk: sunxi-ng: Add machine dependency to A83T CCU

2021-09-13T07:03:20Z

The CCUs for all other 32-bit SoCs have a dependency on a specific MACH_SUNxI symbol. This effectively hides these drivers when building an ARCH=arm64 kernel. However, the A83T CCU still shows up because it is missing this dependency. Let's add it for consistency. Signed-off-by: Samuel Holland Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20210902230200.29574-1-samuel@sholland.org

clk: sunxi-ng: Add support for the Allwinner H616 CCU

2021-01-28T10:14:35Z

While the clocks are fairly similar to the H6, many differ in tiny details, so a separate clock driver seems indicated. Derived from the H6 clock driver, and adjusted according to the manual. Signed-off-by: Andre Przywara Acked-by: Maxime Ripard Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20210127172500.13356-4-andre.przywara@arm.com

clk: sunxi-ng: Add support for the Allwinner H616 R-CCU

2021-01-28T10:14:30Z

The clocks itself are identical to the H6 R-CCU, it's just that the H616 has not all of them implemented (or connected). Signed-off-by: Andre Przywara Acked-by: Maxime Ripard Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20210127172500.13356-3-andre.przywara@arm.com

clk: sunxi-ng: add support for the Allwinner A100 CCU

2020-08-25T08:52:18Z

Add support for a100 in the sunxi-ng CCU framework. Signed-off-by: Yangtao Li Signed-off-by: Maxime Ripard Acked-by: Rob Herring Link: https://lore.kernel.org/r/1eb41bf6c966a0e54820200650d27a5d4f2ac160.1595572867.git.frank@allwinnertech.com

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46Z

Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman