linux/drivers/reset/core.c, branch v4.14

reset: make (de)assert report success for self-deasserting reset drivers

2017-07-19T10:10:48Z

By now there are drivers using shared reset controls and (de)assert calls on platforms with self-deasserting reset lines and thus reset drivers that do not implement .assert() and .deassert(). As long as the initial state of the reset line is deasserted, there is no reason for a reset_control_assert call to return an error for shared reset controls, or for a reset_control_deassert call to return an error for either shared or exclusive reset controls: after a call to reset_control_deassert the reset line is guaranteed to be deasserted, and after a call to reset_control_assert it is valid for the reset line to stay deasserted for shared reset controls. Signed-off-by: Philipp Zabel Reviewed-by: Linus Walleij

reset: Add APIs to manage array of resets

2017-07-19T08:28:12Z

Many devices may want to request a bunch of resets and control them. So it's better to manage them as an array. Add APIs to _get() an array of reset_control, reusing the _assert(), _deassert(), and _reset() APIs for single reset controls. Since reset controls already may control multiple reset lines with a single hardware bit, from the user perspective, reset control arrays are not at all different from single reset controls. Note that these APIs don't guarantee that the reset lines managed in the array are handled in any particular order. Cc: Felipe Balbi Cc: Jon Hunter Signed-off-by: Vivek Gautam [p.zabel@pengutronix.de: changed API to hide reset control arrays behind struct reset_control] Signed-off-by: Philipp Zabel

reset: use kref for reference counting

2017-06-06T07:39:20Z

Use kref for reference counting and enjoy the advantages of refcount_t. Signed-off-by: Philipp Zabel

reset: add exported __reset_control_get, return NULL if optional

2017-04-04T15:36:10Z

Rename the internal __reset_control_get/put functions to __reset_control_get/put_internal and add an exported __reset_control_get equivalent to __of_reset_control_get that takes a struct device parameter. This avoids the confusing call to __of_reset_control_get in the non-DT case and fixes the devm_reset_control_get_optional function to return NULL if RESET_CONTROLLER is enabled but dev->of_node == NULL. Fixes: bb475230b8e5 ("reset: make optional functions really optional") Reported-by: Andy Shevchenko Tested-by: Andy Shevchenko Cc: Ramiro Oliveira Signed-off-by: Philipp Zabel

Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

2017-02-23T23:57:04Z

Pull ARM SoC driver updates from Arnd Bergmann: "Driver updates for ARM SoCs. A handful of driver changes this time around. The larger changes are: - Reset drivers for hi3660 and zx2967 - AHCI driver for Davinci, acked by Tejun and brought in here due to platform dependencies - Cleanups of atmel-ebi (External Bus Interface) - Tweaks for Rockchip GRF (General Register File) usage (kitchensink misc register range on the SoCs) - PM domains changes for support of two new ZTE SoCs (zx296718 and zx2967)" * tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (53 commits) soc: samsung: pmu: Add register defines for pad retention control reset: make zx2967 explicitly non-modular reset: core: fix reset_control_put soc: samsung: pm_domains: Read domain name from the new label property soc: samsung: pm_domains: Remove message about failed memory allocation soc: samsung: pm_domains: Remove unused name field soc: samsung: pm_domains: Use full names in subdomains registration log sata: ahci-da850: un-hardcode the MPY bits sata: ahci-da850: add a workaround for controller instability sata: ahci: export ahci_do_hardreset() locally sata: ahci-da850: implement a workaround for the softreset quirk sata: ahci-da850: add device tree match table sata: ahci-da850: get the sata clock using a connection id soc: samsung: pmu: Remove duplicated define for ARM_L2_OPTION register memory: atmel-ebi: Enable the SMC clock if specified soc: samsung: pmu: Remove unused and duplicated defines memory: atmel-ebi: Properly handle multiple reference to the same CS memory: atmel-ebi: Fix the test to enable generic SMC logic soc: samsung: pm_domains: Add new Exynos5433 compatible soc: samsung: pmu: Add dummy support for Exynos5433 SoC ...

reset: fix shared reset triggered_count decrement on error

2017-02-17T07:11:47Z

For a shared reset, when the reset is successful, the triggered_count is incremented when trying to call the reset callback, so that another device sharing the same reset line won't trigger it again. If the reset has not been triggered successfully, the trigger_count should be decremented. The code does the opposite, and decrements the trigger_count on success. As a consequence, another device sharing the reset will be able to trigger it again. Fixed be removing negation in from of the error code of the reset function. Fixes: 7da33a37b48f ("reset: allow using reset_control_reset with shared reset") Signed-off-by: Jerome Brunet Acked-by: Martin Blumenstingl Signed-off-by: Philipp Zabel

reset: core: fix reset_control_put

2017-02-01T15:04:25Z

Commit "reset: make optional functions really optional" missed to adjust one check in reset_control_put, causing a NULL pointer access for optional resets. Fixes: bb475230b8e5 "reset: make optional functions really optional" Signed-off-by: Heiner Kallweit Signed-off-by: Philipp Zabel

reset: make optional functions really optional

2017-01-20T09:36:15Z

The *_get_optional_* functions weren't really optional so this patch makes them really optional. These *_get_optional_* functions will now return NULL instead of an error if no matching reset phandle is found in the DT, and all the reset_control_* functions now accept NULL rstc pointers. Signed-off-by: Ramiro Oliveira Signed-off-by: Philipp Zabel

reset: Change shared flag from int to bool

2017-01-20T09:36:14Z

Since the new parameter being added is going to be a bool this patch changes the shared flag from int to bool to match the new parameter. Signed-off-by: Ramiro Oliveira Signed-off-by: Philipp Zabel

reset: allow using reset_control_reset with shared reset

2016-11-14T08:58:28Z

Some SoCs (for example Amlogic GXBB) implement a reset controller which only supports a reset pulse (triggered via reset_control_reset). At the same time multiple devices (in case of the Amlogic GXBB SoC both USB PHYs) are sharing the same reset line. This patch allows using reset_control_reset also for shared resets. There are limitations though: reset_control_reset can only be used if reset_control_assert was not used yet. reset_control_assert can only be used if reset_control_reset was not used yet. For shared resets the reset is only triggered once for the lifetime of the reset_control instance (the reset can be triggered again if all consumers of that specific reset_control are gone, as the reset framework will free the reset_control instance in that case). Signed-off-by: Martin Blumenstingl Signed-off-by: Philipp Zabel