mfd: palmas: Add support for external control configuration

Some of Palmas resources like clock, SMPSs, LDOs etc can be controlled
by external pins ENABLE1, ENABLE2 or NSLEEP.

Add support to configure these resources to externally controlled.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 146 insertions, 0 deletions

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
index e4d1c706df8b..e71fa289eb01 100644
--- a/drivers/mfd/palmas.c
+++ b/drivers/mfd/palmas.c
@@ -25,6 +25,52 @@
 #include <linux/mfd/palmas.h>
 #include <linux/of_device.h>
 
+#define PALMAS_EXT_REQ (PALMAS_EXT_CONTROL_ENABLE1 |	\
+			PALMAS_EXT_CONTROL_ENABLE2 |	\
+			PALMAS_EXT_CONTROL_NSLEEP)
+
+struct palmas_sleep_requestor_info {
+	int id;
+	int reg_offset;
+	int bit_pos;
+};
+
+#define EXTERNAL_REQUESTOR(_id, _offset, _pos)		\
+	[PALMAS_EXTERNAL_REQSTR_ID_##_id] = {		\
+		.id = PALMAS_EXTERNAL_REQSTR_ID_##_id,	\
+		.reg_offset = _offset,			\
+		.bit_pos = _pos,			\
+	}
+
+static struct palmas_sleep_requestor_info sleep_req_info[] = {
+	EXTERNAL_REQUESTOR(REGEN1, 0, 0),
+	EXTERNAL_REQUESTOR(REGEN2, 0, 1),
+	EXTERNAL_REQUESTOR(SYSEN1, 0, 2),
+	EXTERNAL_REQUESTOR(SYSEN2, 0, 3),
+	EXTERNAL_REQUESTOR(CLK32KG, 0, 4),
+	EXTERNAL_REQUESTOR(CLK32KGAUDIO, 0, 5),
+	EXTERNAL_REQUESTOR(REGEN3, 0, 6),
+	EXTERNAL_REQUESTOR(SMPS12, 1, 0),
+	EXTERNAL_REQUESTOR(SMPS3, 1, 1),
+	EXTERNAL_REQUESTOR(SMPS45, 1, 2),
+	EXTERNAL_REQUESTOR(SMPS6, 1, 3),
+	EXTERNAL_REQUESTOR(SMPS7, 1, 4),
+	EXTERNAL_REQUESTOR(SMPS8, 1, 5),
+	EXTERNAL_REQUESTOR(SMPS9, 1, 6),
+	EXTERNAL_REQUESTOR(SMPS10, 1, 7),
+	EXTERNAL_REQUESTOR(LDO1, 2, 0),
+	EXTERNAL_REQUESTOR(LDO2, 2, 1),
+	EXTERNAL_REQUESTOR(LDO3, 2, 2),
+	EXTERNAL_REQUESTOR(LDO4, 2, 3),
+	EXTERNAL_REQUESTOR(LDO5, 2, 4),
+	EXTERNAL_REQUESTOR(LDO6, 2, 5),
+	EXTERNAL_REQUESTOR(LDO7, 2, 6),
+	EXTERNAL_REQUESTOR(LDO8, 2, 7),
+	EXTERNAL_REQUESTOR(LDO9, 3, 0),
+	EXTERNAL_REQUESTOR(LDOLN, 3, 1),
+	EXTERNAL_REQUESTOR(LDOUSB, 3, 2),
+};
+
 static const struct regmap_config palmas_regmap_config[PALMAS_NUM_CLIENTS] = {
 	{
 		.reg_bits = 8,
@@ -186,6 +232,57 @@ static struct regmap_irq_chip palmas_irq_chip = {
 			PALMAS_INT1_MASK),
 };
 
+int palmas_ext_control_req_config(struct palmas *palmas,
+	enum palmas_external_requestor_id id,  int ext_ctrl, bool enable)
+{
+	int preq_mask_bit = 0;
+	int reg_add = 0;
+	int bit_pos;
+	int ret;
+
+	if (!(ext_ctrl & PALMAS_EXT_REQ))
+		return 0;
+
+	if (id >= PALMAS_EXTERNAL_REQSTR_ID_MAX)
+		return 0;
+
+	if (ext_ctrl & PALMAS_EXT_CONTROL_NSLEEP) {
+		reg_add = PALMAS_NSLEEP_RES_ASSIGN;
+		preq_mask_bit = 0;
+	} else if (ext_ctrl & PALMAS_EXT_CONTROL_ENABLE1) {
+		reg_add = PALMAS_ENABLE1_RES_ASSIGN;
+		preq_mask_bit = 1;
+	} else if (ext_ctrl & PALMAS_EXT_CONTROL_ENABLE2) {
+		reg_add = PALMAS_ENABLE2_RES_ASSIGN;
+		preq_mask_bit = 2;
+	}
+
+	bit_pos = sleep_req_info[id].bit_pos;
+	reg_add += sleep_req_info[id].reg_offset;
+	if (enable)
+		ret = palmas_update_bits(palmas, PALMAS_RESOURCE_BASE,
+				reg_add, BIT(bit_pos), BIT(bit_pos));
+	else
+		ret = palmas_update_bits(palmas, PALMAS_RESOURCE_BASE,
+				reg_add, BIT(bit_pos), 0);
+	if (ret < 0) {
+		dev_err(palmas->dev, "Resource reg 0x%02x update failed %d\n",
+			reg_add, ret);
+		return ret;
+	}
+
+	/* Unmask the PREQ */
+	ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
+			PALMAS_POWER_CTRL, BIT(preq_mask_bit), 0);
+	if (ret < 0) {
+		dev_err(palmas->dev, "POWER_CTRL register update failed %d\n",
+			ret);
+		return ret;
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(palmas_ext_control_req_config);
+
 static int palmas_set_pdata_irq_flag(struct i2c_client *i2c,
 		struct palmas_platform_data *pdata)
 {
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index 1a8dd7afe084..d2fca1c6f7df 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -183,6 +183,50 @@ enum palmas_regulators {
 	PALMAS_NUM_REGS,
 };
 
+/* External controll signal name */
+enum {
+	PALMAS_EXT_CONTROL_ENABLE1      = 0x1,
+	PALMAS_EXT_CONTROL_ENABLE2      = 0x2,
+	PALMAS_EXT_CONTROL_NSLEEP       = 0x4,
+};
+
+/*
+ * Palmas device resources can be controlled externally for
+ * enabling/disabling it rather than register write through i2c.
+ * Add the external controlled requestor ID for different resources.
+ */
+enum palmas_external_requestor_id {
+	PALMAS_EXTERNAL_REQSTR_ID_REGEN1,
+	PALMAS_EXTERNAL_REQSTR_ID_REGEN2,
+	PALMAS_EXTERNAL_REQSTR_ID_SYSEN1,
+	PALMAS_EXTERNAL_REQSTR_ID_SYSEN2,
+	PALMAS_EXTERNAL_REQSTR_ID_CLK32KG,
+	PALMAS_EXTERNAL_REQSTR_ID_CLK32KGAUDIO,
+	PALMAS_EXTERNAL_REQSTR_ID_REGEN3,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS12,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS3,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS45,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS6,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS7,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS8,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS9,
+	PALMAS_EXTERNAL_REQSTR_ID_SMPS10,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO1,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO2,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO3,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO4,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO5,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO6,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO7,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO8,
+	PALMAS_EXTERNAL_REQSTR_ID_LDO9,
+	PALMAS_EXTERNAL_REQSTR_ID_LDOLN,
+	PALMAS_EXTERNAL_REQSTR_ID_LDOUSB,
+
+	/* Last entry */
+	PALMAS_EXTERNAL_REQSTR_ID_MAX,
+};
+
 struct palmas_pmic_platform_data {
 	/* An array of pointers to regulator init data indexed by regulator
 	 * ID
@@ -2866,4 +2910,9 @@ static inline int palmas_irq_get_virq(struct palmas *palmas, int irq)
 	return regmap_irq_get_virq(palmas->irq_data, irq);
 }
 
+
+int palmas_ext_control_req_config(struct palmas *palmas,
+	enum palmas_external_requestor_id ext_control_req_id,
+	int ext_ctrl, bool enable);
+
 #endif /*  __LINUX_MFD_PALMAS_H */