Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 733dbd6e authored by Osvaldo Banuelos's avatar Osvaldo Banuelos Committed by Matt Wagantall
Browse files

power: qcom: Add Array Power Mux driver 



Introduce a driver to interface with the APM controller which
is responsible for selecting the power rail sourcing the CPU and
cache memory arrays. Support an API that performs the programming
steps to switch the rail powering these arrays in order to fulfill
the SRAM Vmin requirement across different performance levels.

Change-Id: I7659c00b68c5cc61653c84cb14a30a8ef3c29cca
Signed-off-by: default avatarOsvaldo Banuelos <osvaldob@codeaurora.org>
[abhimany: enable compilation of qcom power dirvers and
resolve trivial merge conflicts]
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent 18faa3da

Documentation/devicetree/bindings/power/qcom/apm.txt

0 → 100644
+51 −0
Original line number Diff line number Diff line 
MSM Array Power Mux (msm-apm)



In some MSM designs, the CPU and caches contain logic which can be powered by

multiple rails. The APM controller exists to enable the selection of the power

rail supplying these arrays. Since a given supply may drop below the array

SRAM minimum operating voltage, the APM controller can be used to request a

switch to a power supply that will guarantee logic state retention.



Required properties

- compatible:	"qcom,msm-apm"

- reg:		Specifies physical base address and size of memory mapped regions

		containing the APM controller, APCS CSR, APC PLL controller, and

		SPM event registers.

- reg-names:	List of strings identifying the reg property entries. This list must

		contain: "pm-apcc-glb", "apcs-csr", "apc0-pll-ctl", "apc1-pll-ctl",

		"apc0-cpu0-spm", "apc0-cpu1-spm", "apc1-cpu0-spm", "apc1-cpu1-spm",

		"apc0-l2-spm", and "apc1-l2-spm".



MSM APM Users



Required properties:

- qcom,apm-ctrl:		phandle of APM controller device node



Example:

	apc_apm: apm@099e0000 {

		compatible = "qcom,msm-apm";

		reg = <0x099e0000 0x1000>,

			<0x09820000 0x10000>,

			<0x06400050 0x8>,

			<0x06480050 0x8>,

			<0x09981068 0x8>,

			<0x09991068 0x8>,

			<0x099b1068 0x8>,

			<0x099c1068 0x8>,

			<0x099a1068 0x8>,

			<0x099d1068 0x8>;

		reg-names = "pm-apcc-glb",

				"apcs-csr",

				"apc0-pll-ctl",

				"apc1-pll-ctl",

				"apc0-cpu0-spm",

				"apc0-cpu1-spm",

				"apc1-cpu0-spm",

				"apc1-cpu1-spm",

				"apc0-l2-spm",

				"apc1-l2-spm";



	foo_user {

		...

		qcom,apm-ctrl = <&apc_apm>;

	};

drivers/power/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -402,3 +402,4 @@ source "drivers/power/reset/Kconfig" 
endif # POWER_SUPPLY



source "drivers/power/avs/Kconfig"

source "drivers/power/qcom/Kconfig"

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -59,3 +59,4 @@ obj-$(CONFIG_POWER_AVS) += avs/ 
obj-$(CONFIG_CHARGER_SMB347)	+= smb347-charger.o

obj-$(CONFIG_CHARGER_TPS65090)	+= tps65090-charger.o

obj-$(CONFIG_POWER_RESET)	+= reset/

obj-$(CONFIG_ARCH_MSM)		+= qcom/

drivers/power/qcom/Kconfig

0 → 100644
+7 −0
Original line number Diff line number Diff line 
config MSM_APM

       bool "Qualcomm Technologies Inc platform specific APM driver"

       help

	Platform specific driver to manage the power source of

	memory arrays. Interfaces with regulator drivers to ensure

	SRAM Vmin requirements are met across different performance

	levels.

drivers/power/qcom/Makefile

0 → 100644
+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_MSM_APM)		+= apm.o