From 4312a0931ae455b56424da2229f291a713d3d97e Mon Sep 17 00:00:00 2001
From: Kiran Gunda <kgunda@codeaurora.org>
Date: Tue, 28 Mar 2017 11:27:59 +0530
Subject: [PATCH] regulator: qpnp-oledb: Add revid support for OLEDB driver

Add PMIC revid support to identify the PMIC subtype for OLEDB driver.
This is useful to enable the functionalities/features that are specific to
certain PMICs like PM660A.

Change-Id: I4539955abb29fe37256e21ac507db646953e0abf
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
 .../bindings/regulator/qpnp-oledb-regulator.txt  |  6 ++++++
 arch/arm/boot/dts/qcom/msm-pm660l.dtsi           |  1 +
 drivers/regulator/qpnp-oledb-regulator.c         | 16 ++++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/qpnp-oledb-regulator.txt b/Documentation/devicetree/bindings/regulator/qpnp-oledb-regulator.txt
index 38f599ba5321..efff6c79a9c0 100644
--- a/Documentation/devicetree/bindings/regulator/qpnp-oledb-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/qpnp-oledb-regulator.txt
@@ -14,6 +14,11 @@ Required Node Structure
 	Value type: <string>
 	Definition: should be "qcom,qpnp-oledb-regulator".
 
+- qcom,pmic-revid
+	Usage:      required
+	Value type: <phandle>
+	Definition: Used to identify the PMIC subtype.
+
 - reg
 	Usage:      required
 	Value type: <prop-encoded-array>
@@ -224,6 +229,7 @@ pm660a_oledb: qpnp-oledb@e000 {
 	compatible = "qcom,qpnp-oledb-regulator";
 	#address-cells = <1>;
 	#size-cells = <1>;
+	qcom,pmic-revid = <&pm660l_revid>;
 	reg = <0xe000 0x100>;
 
 	label = "oledb";
diff --git a/arch/arm/boot/dts/qcom/msm-pm660l.dtsi b/arch/arm/boot/dts/qcom/msm-pm660l.dtsi
index bcdbc4ed7c55..8492ba452d85 100644
--- a/arch/arm/boot/dts/qcom/msm-pm660l.dtsi
+++ b/arch/arm/boot/dts/qcom/msm-pm660l.dtsi
@@ -418,6 +418,7 @@
 		       compatible = "qcom,qpnp-oledb-regulator";
 		       #address-cells = <1>;
 		       #size-cells = <1>;
+		       qcom,pmic-revid = <&pm660l_revid>;
 		       reg = <0xe000 0x100>;
 
 		       label = "oledb";
diff --git a/drivers/regulator/qpnp-oledb-regulator.c b/drivers/regulator/qpnp-oledb-regulator.c
index c012f373e80e..fa14445f9d26 100644
--- a/drivers/regulator/qpnp-oledb-regulator.c
+++ b/drivers/regulator/qpnp-oledb-regulator.c
@@ -27,6 +27,7 @@
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/qpnp-labibb-regulator.h>
 #include <linux/qpnp/qpnp-pbs.h>
+#include <linux/qpnp/qpnp-revid.h>
 
 #define QPNP_OLEDB_REGULATOR_DRIVER_NAME	"qcom,qpnp-oledb-regulator"
 #define OLEDB_VOUT_STEP_MV				100
@@ -162,6 +163,7 @@ struct qpnp_oledb {
 	struct notifier_block			oledb_nb;
 	struct mutex				bus_lock;
 	struct device_node			*pbs_dev_node;
+	struct pmic_revid_data			*pmic_rev_id;
 
 	u32					base;
 	u8					mod_enable;
@@ -1085,8 +1087,22 @@ static int qpnp_oledb_parse_fast_precharge(struct qpnp_oledb *oledb)
 static int qpnp_oledb_parse_dt(struct qpnp_oledb *oledb)
 {
 	int rc = 0;
+	struct device_node *revid_dev_node;
 	struct device_node *of_node = oledb->dev->of_node;
 
+	revid_dev_node = of_parse_phandle(oledb->dev->of_node,
+					"qcom,pmic-revid", 0);
+	if (!revid_dev_node) {
+		pr_err("Missing qcom,pmic-revid property - driver failed\n");
+		return -EINVAL;
+	}
+
+	oledb->pmic_rev_id = get_revid_data(revid_dev_node);
+	if (IS_ERR(oledb->pmic_rev_id)) {
+		pr_debug("Unable to get revid data\n");
+		return -EPROBE_DEFER;
+	}
+
 	oledb->swire_control =
 			of_property_read_bool(of_node, "qcom,swire-control");