If we register a "leds-gpio" platform device for GPIO pins that do not
exist we get a -EPROBE_DEFER and the probe will be tried again later.
If there is no driver to provide that pin we will poll forever and also
create a lot of log messages.
So check if that GPIO driver is configured, if so it will come up
eventually. If not, we exit our probe function early and do not even
bother registering the "leds-gpio". This method was chosen over "Kconfig
depends" since this way we can add support for more devices and GPIO
backends more easily without "depends":ing on all GPIO backends.
Fixes: a6c80bec3c ("leds: simatic-ipc-leds-gpio: Add GPIO version of Siemens driver")
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221007153323.1326-1-henning.schild@siemens.com
On Apollo Lake the pinctrl drivers will now come up without ACPI. Use
that instead of open coding it.
Create a new driver for that which can later be filled with more GPIO
based models, and which has different dependencies.
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Since we have a common P2SB accessor in tree we may use it instead of
open coded variants.
Replace custom code by p2sb_bar() call.
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Sparse (rightly) currently gives the following warning:
drivers/leds/simple/simatic-ipc-leds.c:155:40:
sparse: sparse: incorrect type in assignment (different address spaces)
expected void *static [toplevel] simatic_ipc_led_memory
got void [noderef] __iomem *
Fix this by changing the type of simatic_ipc_led_memory to void __iomem *
and use readl()/writel() to access it.
Cc: Henning Schild <henning.schild@siemens.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Gerd Haeussler <gerd.haeussler.ext@siemens.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
