lk2nd: hw: regulator: gpl: Add PM8937 support and improve error logging

Add support for the PM8937 SPMI regulator and enhance error logging in the `spmi_regulator_probe` function. Also, improve debugging output in `cmd_oem_debug_spmi_regulators`.

lk2nd/fastboot/debug/regulator.c

@@ -51,7 +51,16 @@ static void cmd_oem_debug_spmi_regulators(const char *arg, void *data, unsigned
 
 		snprintf(response, sizeof(response), "Detected PMIC %#x", target);
 		fastboot_info(response);
-		dump_regulators(spmi_regulator_probe(target));
+
+        struct regulator_dev *rdev = spmi_regulator_probe(target);
+		if (!rdev) {
+			snprintf(response, sizeof(response), "No regulators found");
+			fastboot_info(response);
+		} else {
+			snprintf(response, sizeof(response), "Regulator list:");
+			fastboot_info(response);
+			dump_regulators(rdev);
+		}
 	}
 	fastboot_okay("");
 }

lk2nd/hw/regulator/gpl/qcom-spmi-pmic.h

@@ -31,6 +31,7 @@
 #define PM8998_SUBTYPE		0x14
 #define PMI8998_SUBTYPE		0x15
 #define PM8005_SUBTYPE		0x18
+#define PM8937_SUBTYPE		0x19
 #define PM660L_SUBTYPE		0x1a
 #define PM660_SUBTYPE		0x1b
 #define PM8150_SUBTYPE		0x1e

lk2nd/hw/regulator/gpl/qcom_spmi-regulator.c

@@ -2269,6 +2269,39 @@ static const struct spmi_regulator_data pm8916_regulators[] = {
 	{ }
 };
 
+static const struct spmi_regulator_data pm8937_regulators[] = {
+	{ "s1", 0x1400, "vdd_s1", },
+	{ "s2", 0x1700, "vdd_s2", },
+	{ "s3", 0x1a00, "vdd_s3", },
+	{ "s4", 0x1d00, "vdd_s4", },
+	{ "s5", 0x2000, "vdd_s5", },
+	{ "s6", 0x2300, "vdd_s6", },
+	{ "l1", 0x4000, "vdd_l1_l19", },
+	{ "l2", 0x4100, "vdd_l2_l23", },
+	{ "l3", 0x4200, "vdd_l3", },
+	{ "l4", 0x4300, "vdd_l4_l5_l6_l7_l16", },
+	{ "l5", 0x4400, "vdd_l4_l5_l6_l7_l16", },
+	{ "l6", 0x4500, "vdd_l4_l5_l6_l7_l16", },
+	{ "l7", 0x4600, "vdd_l4_l5_l6_l7_l16", },
+	{ "l8", 0x4700, "vdd_l8_l11_l12_l17_l22", },
+	{ "l9", 0x4800, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l10", 0x4900, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l11", 0x4a00, "vdd_l8_l11_l12_l17_l22", },
+	{ "l12", 0x4b00, "vdd_l8_l11_l12_l17_l22", },
+	{ "l13", 0x4c00, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l14", 0x4d00, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l15", 0x4e00, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l16", 0x4f00, "vdd_l4_l5_l6_l7_l16", },
+	{ "l17", 0x5000, "vdd_l8_l11_l12_l17_l22", },
+	{ "l18", 0x5100, "vdd_l9_l10_l13_l14_l15_l18", },
+	{ "l19", 0x5200, "vdd_l1_l19", },
+	{ "l20", 0x5300, "vdd_l20_l21", },
+	{ "l21", 0x5400, "vdd_l21_l21", },
+	{ "l22", 0x5500, "vdd_l8_l11_l12_l17_l22", },
+	{ "l23", 0x5600, "vdd_l2_l23", },
+	{ }
+};
+
 static const struct spmi_regulator_data pm8941_regulators[] = {
 	{ "s1", 0x1400, "vdd_s1", },
 	{ "s2", 0x1700, "vdd_s2", },
@@ -2586,6 +2619,7 @@ static const struct spmi_regulator_match qcom_spmi_regulator_match[] = {
 	{ .subtype = PM8226_SUBTYPE,  .sid = 1, .data = pm8226_regulators },
 	{ .subtype = PM8841_SUBTYPE,  .sid = 5, .data = pm8841_regulators },
 	{ .subtype = PM8916_SUBTYPE,  .sid = 1, .data = pm8916_regulators },
+	{ .subtype = PM8937_SUBTYPE,  .sid = 1, .data = pm8937_regulators },
 	{ .subtype = PM8941_SUBTYPE,  .sid = 1, .data = pm8941_regulators },
 	{ .subtype = PM8950_SUBTYPE,  .sid = 1, .data = pm8950_regulators },
 	{ .subtype = PM8994_SUBTYPE,  .sid = 1, .data = pm8994_regulators },
@@ -2619,15 +2653,19 @@ struct regulator_dev *spmi_regulator_probe(uint8_t subtype)
 	unsigned int i;
 	int ret;
 
-	if (!match)
+	if (!match) {
+		dprintf(CRITICAL, "Failed to find SPMI regulator match for subtype 0x%02X\n", subtype);
 		return NULL;
+	}
 
 	for (data = match->data; data->name; ++data)
 		++num;
 
 	vreg = calloc(num, sizeof(*vreg));
-	if (!vreg)
+	if (!vreg) {
+		dprintf(CRITICAL, "Failed to allocate memory for SPMI regulator\n");
 		return NULL;
+	}
 
 	for (i = 0; i < num; ++i) {
 		const struct spmi_regulator_data *reg = &match->data[i];
@@ -2637,9 +2675,11 @@ struct regulator_dev *spmi_regulator_probe(uint8_t subtype)
 		vreg[i].base = (match->sid << 16) | reg->base;
 
 		ret = spmi_regulator_match(&vreg[i], reg->force_type);
-		if (ret)
-			dprintf(CRITICAL, "Failed to match SPMI regulator %s\n",
-				reg->name);
+		if (ret) {
+			dprintf(CRITICAL, "Failed to match SPMI regulator %s\n", reg->name);
+			dprintf(CRITICAL, "subtype=%u, force_type=0x%02X, logical_type=%u\n",
+				subtype, reg->force_type, vreg[i].logical_type);
+		}
 
 		if (vreg[i].set_points)
 			vreg[i].desc.driver_type = vreg[i].set_points->type;