kernel/linux.git/include/linux/mfd/syscon.h, branch v6.19.11

mfd: syscon: Add of_syscon_register_regmap() API

2024-06-26T15:46:50+00:00

The of_syscon_register_regmap() API allows an externally created regmap to be registered with syscon. This regmap can then be returned to client drivers using the syscon_regmap_lookup_by_phandle() APIs. The API is used by platforms where mmio access to the syscon registers is not possible, and a underlying soc driver like exynos-pmu provides a SoC specific regmap that can issue a SMC or hypervisor call to write the register. This approach keeps the SoC complexities out of syscon, but allows common drivers such as syscon-poweroff, syscon-reboot and friends that are used by many SoCs already to be re-used. Signed-off-by: Peter Griffin Reviewed-by: Arnd Bergmann Reviewed-by: Sam Protsenko Tested-by: Will McVicker Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20240621115544.1655458-2-peter.griffin@linaro.org Signed-off-by: Lee Jones

mfd: syscon: Remove extern from function prototypes

2024-02-23T16:02:09+00:00

The kernel coding style does not require 'extern' in function prototypes in .h files, so remove them as they are not needed. To avoid checkpatch warnings such as CHECK: Lines should not end with a '(' +struct regmap *syscon_regmap_lookup_by_phandle( The indentation is also updated. No functional changes in this patch. Signed-off-by: Peter Griffin Link: https://lore.kernel.org/r/20240220115012.471689-3-peter.griffin@linaro.org Signed-off-by: Lee Jones

mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional() function.

2020-11-19T08:30:11+00:00

This adds syscon_regmap_lookup_by_phandle_optional() function to get an optional regmap. It behaves the same as syscon_regmap_lookup_by_phandle() except where there is no regmap phandle. In this case, instead of returning -ENODEV, the function returns NULL. This makes error checking simpler when the regmap phandle is optional. Suggested-by: Nicolas Boichat Signed-off-by: Enric Balletbo i Serra Reviewed-by: Matthias Brugger Reviewed-by: Arnd Bergmann Signed-off-by: Lee Jones

mfd: syscon: Fix syscon_regmap_lookup_by_phandle_args() dummy

2020-02-03T08:39:49+00:00

If CONFIG_MFD_SYSCON=n: include/linux/mfd/syscon.h:54:23: warning: ‘syscon_regmap_lookup_by_phandle_args’ defined but not used [-Wunused-function] Fix this by adding the missing inline keyword. Fixes: 6a24f567af4accef ("mfd: syscon: Add arguments support for syscon reference") Signed-off-by: Geert Uytterhoeven Signed-off-by: Lee Jones

mfd: syscon: Add arguments support for syscon reference

2020-01-24T07:33:59+00:00

There are a lot of similar global registers being used across multiple SoCs from Unisoc. But most of these registers are assigned with different offset for different SoCs. It is hard to handle all of them in an all-in-one kernel image. Add a helper function to get regmap with arguments where we could put some extra information such as the offset value. Signed-off-by: Orson Zhai Tested-by: Baolin Wang Reviewed-by: Arnd Bergmann Signed-off-by: Lee Jones

mfd/syscon: Add device_node_to_regmap()

2019-08-08T22:30:07+00:00

device_node_to_regmap() is exactly like syscon_node_to_regmap(), but it does not check that the node is compatible with "syscon", and won't attach the first clock it finds to the regmap. The rationale behind this, is that one device node with a standard compatible string "foo,bar" can be covered by multiple drivers sharing a regmap, or by a single driver doing all the job without a regmap, but these are implementation details which shouldn't reflect on the devicetree. Signed-off-by: Paul Cercueil Acked-by: Arnd Bergmann Signed-off-by: Paul Burton Cc: Ralf Baechle Cc: James Hogan Cc: Jonathan Corbet Cc: Lee Jones Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: Michael Turquette Cc: Stephen Boyd Cc: Jason Cooper Cc: Marc Zyngier Cc: Rob Herring Cc: Mark Rutland Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: od@zcrc.me Cc: Mathieu Malaterre

mfd: Remove unused helper syscon_regmap_lookup_by_pdevname

2019-06-24T03:22:30+00:00

Nobody uses the exported helper syscon_regmap_lookup_by_pdevname, to lookup a device by name. Let us remove it. Suggested-by: Arnd Bergman Cc: Arnd Bergman Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Signed-off-by: Suzuki K Poulose Signed-off-by: Greg Kroah-Hartman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

mfd: syscon: Include errno.h from header

2016-04-11T12:31:40+00:00

The syscon header uses the ENOTSUPP error constant, but doesn't include the header that defines it. This causes a build error after the imx pinctrl driver started using syscon: include/linux/mfd/syscon.h: In function 'syscon_node_to_regmap': include/linux/mfd/syscon.h:32:18: error: 'ENOTSUPP' undeclared (first use in this function) return ERR_PTR(-ENOTSUPP); ^~~~~~~~ This adds the missing #include. Signed-off-by: Arnd Bergmann Fixes: 8626ada871f1 ("pinctrl: imx: attach iomuxc device to gpr syscon") Signed-off-by: Lee Jones

mfd: syscon: Return ENOTSUPP instead of ENOSYS when disabled

2016-03-16T08:50:35+00:00

When CONFIG_MFD_SYSCON is disabled, have the function stubs return ENOTSUPP to indicate the syscon functionality is not available. There are currently no callers that depend on the ENOSYS return value. This patchfixes a checkpatch warning: WARNING: ENOSYS means 'invalid syscall nr' and nothing else Signed-off-by: Philipp Zabel Signed-off-by: Lee Jones