linux-toradex.git/drivers/hwspinlock/hwspinlock_core.c, branch v5.5

hwspinlock: Let the PM runtime can be optional

2019-11-09T00:42:00+00:00

Now some hwspinlock controllers did not have the requirement to implement
the PM runtime, but drivers must enable the PM runtime to comply with the
hwspinlock core.

Thus we can change the PM runtime support to be optional by validating
the -EACCES error number which means the PM runtime is not enabled, and
removing the return value validating of pm_runtime_put(). So that we
can remove some redundant PM runtime code in drivers.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: Remove BUG_ON() from the hwspinlock core

2019-11-09T00:41:13+00:00

The original code use BUG_ON() to validate the parameters when locking
or unlocking one hardware lock, but we should not crash the whole kernel
though the hwlock parameters are incorrect, instead we can return
the error number for users and give some warning.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: add the 'in_atomic' API

2019-06-30T04:08:14+00:00

Add the 'in_atomic' mode which can be called from an atomic context.
This mode relies on the existing 'raw' mode (no lock, no preemption/irq
disabling) with the difference that the timeout is not based on jiffies
(jiffies won't increase when irq are disabled) but handled with
busy-waiting udelay() calls.

Signed-off-by: Fabien Dessenne 
Signed-off-by: Bjorn Andersson

hwspinlock: ignore disabled device

2019-06-29T19:05:06+00:00

Do not wait for hwspinlock device registration if it is not available
for use.

Acked-by: Suman Anna 
Signed-off-by: Fabien Dessenne 
Signed-off-by: Bjorn Andersson

hwspinlock: Fix incorrect return pointers

2018-07-31T03:54:51+00:00

The commit 4f1acd758b08 ("hwspinlock: Add devm_xxx() APIs to request/free
hwlock") introduces one bug, that will return one error pointer if failed
to request one hwlock, but we expect NULL pointer on error for consumers.
This patch will fix this issue.

Reported-by: Dan Carpenter 
Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: Fix one comment mistake

2018-06-26T20:46:34+00:00

Fix one comment mistake with correct function names.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: Add devm_xxx() APIs to register/unregister one hwlock controller

2018-06-26T20:46:23+00:00

This patch introduces devm_hwspin_lock_register() and devm_hwspin_lock_unregister()
interfaces to help to register or unregister one hardware spinlock controller, that
will help to simplify the cleanup code for hwspinlock drivers.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: Add devm_xxx() APIs to request/free hwlock

2018-06-26T20:27:58+00:00

This patch introduces some devm_xxx() APIs to help to request or free
the hwlocks, which will help to simplify the cleanup code for drivers
requesting one hwlock, ensuring that the hwlock is automatically freed
whenever the device is unbound.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock: Add one new API to support getting a specific hwlock by the name

2018-06-26T20:27:22+00:00

The hardware spinlock binding already supplied the 'hwlock-names' property
to match and get a specific hwlock, but did not supply one API for users
to get a specific hwlock by the hwlock name. So this patch introduces one
API to support this requirement.

Signed-off-by: Baolin Wang 
Signed-off-by: Bjorn Andersson

hwspinlock/core: Switch to SPDX license identifier

2018-05-24T19:04:32+00:00

Use the appropriate SPDX license identifier in the Hwspinlock core
driver source files and drop the previous boilerplate license text.

Signed-off-by: Suman Anna 
Signed-off-by: Bjorn Andersson