regulator: rpm-smd: Add snapshot of rpm-smd regulator driver

Add snapshot of rpm-smd regulator driver from msm-4.19.
This snapshot is taken as of msm-4.19 commit 15bff51c0329
("smcinvoke : Add locking to shared variables").

Change-Id: I96cd163e490f811c0564dbdf30fb250156cffc85
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>

drivers/regulator/Kconfig

@@ -1181,6 +1181,17 @@ config REGULATOR_RPMH
 	  control allows for voting on regulator state between multiple
 	  processors within the SoC.
 
+config REGULATOR_RPM_SMD
+	bool "RPM SMD regulator driver"
+	depends on OF
+	depends on MSM_RPM_SMD
+	help
+	  Compile in support for the RPM SMD regulator driver which is used for
+	  setting voltages and other parameters of the various power rails
+	  supplied by some Qualcomm Technologies Inc. PMICs. The RPM SMD regulator driver should
+	  be used on systems which contain an RPM which communicates with the
+	  application processor over SMD.
+
 config REGULATOR_STUB
 	tristate "Stub Regulator"
 	help

drivers/regulator/Makefile

@@ -87,6 +87,7 @@ obj-$(CONFIG_REGULATOR_QCOM_PM8008) += qcom_pm8008-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
+obj-$(CONFIG_REGULATOR_RPM_SMD) += rpm-smd-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
 obj-$(CONFIG_REGULATOR_QPNP_LCDB) += qpnp-lcdb-regulator.o
 obj-$(CONFIG_REGULATOR_QPNP_AMOLED) += qpnp-amoled-regulator.o

include/linux/regulator/rpm-smd-regulator.h

@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2012-2013, 2015, 2017, 2019, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _LINUX_REGULATOR_RPM_SMD_H
+#define _LINUX_REGULATOR_RPM_SMD_H
+
+#include <linux/device.h>
+
+struct rpm_regulator;
+
+/**
+ * enum rpm_regulator_voltage_corner - possible voltage corner values
+ *
+ * These should be used in regulator_set_voltage() and
+ * rpm_regulator_set_voltage() calls for corner type regulators as if they had
+ * units of uV.
+ *
+ * Note, the meaning of corner values is set by the RPM.  It is possible that
+ * future platforms will utilize different corner values.  The values specified
+ * in this enum correspond to MSM8974 for PMIC PM8841 SMPS 2 (VDD_Dig).
+ */
+enum rpm_regulator_voltage_corner {
+	RPM_REGULATOR_CORNER_NONE = 1,
+	RPM_REGULATOR_CORNER_RETENTION,
+	RPM_REGULATOR_CORNER_SVS_KRAIT,
+	RPM_REGULATOR_CORNER_SVS_SOC,
+	RPM_REGULATOR_CORNER_NORMAL,
+	RPM_REGULATOR_CORNER_TURBO,
+	RPM_REGULATOR_CORNER_SUPER_TURBO,
+};
+
+/**
+ * enum rpm_regulator_voltage_level - possible voltage level values
+ *
+ * These should be used in regulator_set_voltage() and
+ * rpm_regulator_set_voltage() calls for level type regulators as if they had
+ * units of uV.
+ *
+ * Note: the meaning of level values is set by the RPM.
+ */
+enum rpm_regulator_voltage_level {
+	RPM_REGULATOR_LEVEL_NONE		= 0,
+	RPM_REGULATOR_LEVEL_RETENTION		= 16,
+	RPM_REGULATOR_LEVEL_RETENTION_PLUS	= 32,
+	RPM_REGULATOR_LEVEL_MIN_SVS		= 48,
+	RPM_REGULATOR_LEVEL_LOW_SVS		= 64,
+	RPM_REGULATOR_LEVEL_SVS			= 128,
+	RPM_REGULATOR_LEVEL_SVS_PLUS		= 192,
+	RPM_REGULATOR_LEVEL_NOM			= 256,
+	RPM_REGULATOR_LEVEL_NOM_PLUS		= 320,
+	RPM_REGULATOR_LEVEL_TURBO		= 384,
+	RPM_REGULATOR_LEVEL_TURBO_NO_CPR	= 416,
+	RPM_REGULATOR_LEVEL_BINNING		= 512,
+	RPM_REGULATOR_LEVEL_MAX			= 65535,
+};
+
+/**
+ * enum rpm_regulator_mode - control mode for LDO or SMPS type regulators
+ * %RPM_REGULATOR_MODE_AUTO:	For SMPS type regulators, use SMPS auto mode so
+ *				that the hardware can automatically switch
+ *				between PFM and PWM modes based on realtime
+ *				load.
+ *				LDO type regulators do not support this mode.
+ * %RPM_REGULATOR_MODE_IPEAK:	For SMPS type regulators, use aggregated
+ *				software current requests to determine
+ *				usage of PFM or PWM mode.
+ *				For LDO type regulators, use aggregated
+ *				software current requests to determine
+ *				usage of LPM or HPM mode.
+ * %RPM_REGULATOR_MODE_HPM:	For SMPS type regulators, force the
+ *				usage of PWM mode.
+ *				For LDO type regulators, force the
+ *				usage of HPM mode.
+ *
+ * These values should be used in calls to rpm_regulator_set_mode().
+ */
+enum rpm_regulator_mode {
+	RPM_REGULATOR_MODE_AUTO,
+	RPM_REGULATOR_MODE_IPEAK,
+	RPM_REGULATOR_MODE_HPM,
+};
+
+#ifdef CONFIG_REGULATOR_RPM_SMD
+
+struct rpm_regulator *rpm_regulator_get(struct device *dev, const char *supply);
+
+void rpm_regulator_put(struct rpm_regulator *regulator);
+
+int rpm_regulator_enable(struct rpm_regulator *regulator);
+
+int rpm_regulator_disable(struct rpm_regulator *regulator);
+
+int rpm_regulator_set_voltage(struct rpm_regulator *regulator, int min_uV,
+			      int max_uV);
+
+int rpm_regulator_set_mode(struct rpm_regulator *regulator,
+				enum rpm_regulator_mode mode);
+
+int __init rpm_smd_regulator_driver_init(void);
+
+#else
+
+static inline struct rpm_regulator *rpm_regulator_get(struct device *dev,
+					const char *supply) { return NULL; }
+
+static inline void rpm_regulator_put(struct rpm_regulator *regulator) { }
+
+static inline int rpm_regulator_enable(struct rpm_regulator *regulator)
+			{ return 0; }
+
+static inline int rpm_regulator_disable(struct rpm_regulator *regulator)
+			{ return 0; }
+
+static inline int rpm_regulator_set_voltage(struct rpm_regulator *regulator,
+					int min_uV, int max_uV) { return 0; }
+
+static inline int rpm_regulator_set_mode(struct rpm_regulator *regulator,
+				enum rpm_regulator_mode mode) { return 0; }
+
+static inline int __init rpm_smd_regulator_driver_init(void) { return 0; }
+
+#endif /* CONFIG_REGULATOR_RPM_SMD */
+
+#ifdef CONFIG_DEBUG_FS
+
+static void rpm_vreg_create_debugfs(struct rpm_regulator *reg);
+
+#else
+
+static inline void rpm_vreg_create_debugfs(struct rpm_regulator *reg)
+{
+}
+#endif
+#endif