leds: ip30: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/r/20230704094745.25665-1-frank.li@vivo.com
Signed-off-by: Lee Jones <lee@kernel.org>

leds: ip30: compile if COMPILE_TEST=y

This driver can be compiled on other platforms with small change if
COMPILE_TEST=y.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

leds: ip30: label power LED as such

Make label "white:power" to be consistent with dt-bindings/leds/common.h .

Signed-off-by: Pavel Machek <pavel@ucw.cz>

leds: add SGI IP30 led support

This patch implemenets a driver to support the front panel LEDs of
SGI Octane (IP30) workstations.

Reviewed-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>