linux.git/drivers/soc/apple/apple-pmgr-misc.c, branch master Linux kernel source tree soc: apple: Add driver for Apple PMGR misc controls 2026-07-14T18:28:42+00:00 Hector Martin marcan@marcan.st 2026-07-05T08:16:31+00:00 fef9350c314bf089a11a62858261e6576ada867b Apple SoCs have PMGR blocks that control a bunch of power-related features. Besides the existing device power state controls (which are very uniform and handled by apple-pmgr-pwrstate), we also need to manage more random registers such as SoC-wide fabric and memory controller power states, which have a different interface. Add a driver for these kitchen sink controls. Right now it implements fabric and memory controller power state switching on system standby/s2idle, which saves about 1W of power or so on t60xx platforms. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Sven Peter <sven@kernel.org> Co-developed-by: Sasha Finkelstein <k@chaosmail.tech> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech> Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com> Link: https://patch.msgid.link/20260705-pmgr-misc-v3-2-51b75fed6f73@chaosmail.tech Signed-off-by: Sven Peter <sven@kernel.org> 
Apple SoCs have PMGR blocks that control a bunch of power-related
features. Besides the existing device power state controls (which are
very uniform and handled by apple-pmgr-pwrstate), we also need to manage
more random registers such as SoC-wide fabric and memory controller
power states, which have a different interface.

Add a driver for these kitchen sink controls. Right now it implements
fabric and memory controller power state switching on system
standby/s2idle, which saves about 1W of power or so on t60xx platforms.

Signed-off-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Sven Peter <sven@kernel.org>
Co-developed-by: Sasha Finkelstein <k@chaosmail.tech>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Link: https://patch.msgid.link/20260705-pmgr-misc-v3-2-51b75fed6f73@chaosmail.tech
Signed-off-by: Sven Peter <sven@kernel.org>