regulator: spm_regulator: Add snapshot of spm_regulator driver

This is snapshot of the spm_regulator driver as of msm-4.4
'commit 26efcc23eb82 ("regulator: spm: check min/max voltages
against HW configuration")'.

Also replace the __invoke_psci_fn_smc wrapper with arm_smccc_smc as
__invoke_psci_fn_smc is no longer available.

Change-Id: Ia6ded6dc21ecff2114ddd20e26706d9196239956
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

Documentation/devicetree/bindings/regulator/spm-regulator.txt

@@ -0,0 +1,61 @@
+Qualcomm Technologies Inc. SPM Regulators
+
+spm-regulator is a regulator device which supports PMIC processor supply
+regulators via the SPM module.
+
+Required properties:
+- compatible:      Must be "qcom,spm-regulator"
+- reg:             Specifies the SPMI address and size for this regulator device
+- regulator-name:  A string used as a descriptive name for the regulator
+
+Required structure:
+- A qcom,spm-regulator node must be a child of an SPMI node that has specified
+	the spmi-slave-container property
+
+Optional properties:
+- qcom,mode:       A string which specifies the mode to use for the regulator.
+		    Supported values are "pwm" and "auto".  PWM mode is more
+		    robust, but draws more current than auto mode.  If this
+		    property is not specified, then the regulator will remain
+		    in whatever mode hardware or bootloaders set it to.
+- qcom,cpu-num:    Specifies which CPU this regulator powers.  This property is
+		    not need when the SPM regulator is shared between all CPUs.
+- qcom,bypass-spm: Boolean flag which indicates that voltage control should not
+		    be managed by an SPM.  Instead, the voltage should be
+		    controlled via SPMI.
+- qcom,max-voltage-step:  Maximum single voltage step size in microvolts.
+- qcom,recal-mask: Bit mask of the APSS clusters to recalibrate after each
+		    voltage change.  Bit 0 corresponds to the first cluster,
+		    bit 1 corresponds to the second cluster, and so on.
+
+Optional structure:
+- A child node may be specified within a qcom,spm-regulator node which defines
+	an additional regulator which controls the AVS minimum and maximum
+	voltage limits.
+- The AVS child node must contain these properties defined in regulator.txt:
+	regulator-name, regulator-min-microvolt, regulator-max-microvolt.
+
+All properties specified within the core regulator framework can also be used.
+These bindings can be found in regulator.txt.
+
+Example:
+	qcom,spmi@fc4c0000 {
+
+		qcom,pm8226@1 {
+			spmi-slave-container;
+
+			spm-regulator@1700 {
+				compatible = "qcom,spm-regulator";
+				regulator-name = "8226_s2";
+				reg = <0x1700 0x100>;
+				regulator-min-microvolt = <900000>;
+				regulator-max-microvolt = <1275000>;
+
+				avs-limit-regulator {
+					regulator-name = "8226_s2_avs_limit";
+					regulator-min-microvolt = <900000>;
+					regulator-max-microvolt = <1275000>;
+				}
+			};
+		};
+	};

drivers/regulator/Kconfig

@@ -1057,6 +1057,16 @@ config REGULATOR_RPM_SMD
 	  be used on systems which contain an RPM which communicates with the
 	  application processor over SMD.
 
+config REGULATOR_SPM
+	bool "SPM regulator driver"
+	depends on SPMI
+	help
+	  Enable support for the SPM regulator driver which is used for
+	  setting voltages of processor supply regulators via the SPM module
+	  found inside chips of Qualcomm Technologies Inc. The SPM regulator
+	  driver can be used on QTI SoCs where the APSS processor cores are
+	  supplied by their own PMIC regulator.
+
 config REGULATOR_STUB
 	tristate "Stub Regulator"
 	help

drivers/regulator/Makefile

@@ -114,6 +114,7 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
 obj-$(CONFIG_REGULATOR_RPM_SMD) += rpm-smd-regulator.o
+obj-$(CONFIG_REGULATOR_SPM) += spm-regulator.o
 
 obj-$(CONFIG_REGULATOR_CPR3) += cpr3-regulator.o cpr3-util.o
 obj-$(CONFIG_REGULATOR_CPR3_HMSS) += cpr3-hmss-regulator.o

include/linux/regulator/spm-regulator.h

@@ -0,0 +1,25 @@
+/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _LINUX_REGULATOR_SPM_H
+#define _LINUX_REGULATOR_SPM_H
+
+#include <linux/err.h>
+#include <linux/init.h>
+
+#ifdef CONFIG_REGULATOR_SPM
+int __init spm_regulator_init(void);
+#else
+static inline int __init spm_regulator_init(void) { return -ENODEV; }
+#endif
+
+#endif