drivers: allwinner: axp: Add AXP805 support

This adds the new regulator list, as well as changes to make the switch
(equivalent to DC1SW on the AXP803) work on both PMICs.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: I9a1eac8ddfc54b27096c10a8eebdd51aaf9b8311

drivers/allwinner/axp/axp805.c

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <drivers/allwinner/axp.h>
+
+const uint8_t axp_chip_id = AXP805_CHIP_ID;
+const char *const axp_compatible = "x-powers,axp805";
+
+/*
+ * The "dcdcd" split changes the step size by a factor of 5, not 2;
+ * disallow values above the split to maintain accuracy.
+ */
+const struct axp_regulator axp_regulators[] = {
+	{"dcdca",  600, 1520,  10, 50, 0x12, 0x10, 0},
+	{"dcdcb", 1000, 2550,  50, NA, 0x13, 0x10, 1},
+	{"dcdcc",  600, 1520,  10, 50, 0x14, 0x10, 2},
+	{"dcdcd",  600, 1500,  20, NA, 0x15, 0x10, 3},
+	{"dcdce", 1100, 3400, 100, NA, 0x16, 0x10, 4},
+	{"aldo1",  700, 3300, 100, NA, 0x17, 0x10, 5},
+	{"aldo2",  700, 3300, 100, NA, 0x18, 0x10, 6},
+	{"aldo3",  700, 3300, 100, NA, 0x19, 0x10, 7},
+	{"bldo1",  700, 1900, 100, NA, 0x20, 0x11, 0},
+	{"bldo2",  700, 1900, 100, NA, 0x21, 0x11, 1},
+	{"bldo3",  700, 1900, 100, NA, 0x22, 0x11, 2},
+	{"bldo4",  700, 1900, 100, NA, 0x23, 0x11, 3},
+	{"cldo1",  700, 3300, 100, NA, 0x24, 0x11, 4},
+	{"cldo2",  700, 4200, 100, 27, 0x25, 0x11, 5},
+	{"cldo3",  700, 3300, 100, NA, 0x26, 0x11, 6},
+	{}
+};

drivers/allwinner/axp/common.c

@@ -108,7 +108,7 @@ static bool should_enable_regulator(const void *fdt, int node)
 void axp_setup_regulators(const void *fdt)
 {
 	int node;
-	bool dc1sw = false;
+	bool sw = false;
 
 	if (fdt == NULL)
 		return;
@@ -120,6 +120,7 @@ void axp_setup_regulators(const void *fdt)
 		return;
 	}
 
+	/* This applies to AXP803 only. */
 	if (fdt_getprop(fdt, node, "x-powers,drive-vbus-en", NULL)) {
 		axp_clrbits(0x8f, BIT(4));
 		axp_setbits(0x30, BIT(2));
@@ -144,26 +145,31 @@ void axp_setup_regulators(const void *fdt)
 			continue;
 
 		name = fdt_get_name(fdt, node, &length);
+
+		/* Enable the switch last to avoid overheating. */
+		if (!strncmp(name, "dc1sw", length) ||
+		    !strncmp(name, "sw", length)) {
+			sw = true;
+			continue;
+		}
+
 		for (reg = axp_regulators; reg->dt_name; reg++) {
 			if (!strncmp(name, reg->dt_name, length)) {
 				setup_regulator(fdt, node, reg);
 				break;
 			}
 		}
-
-		if (!strncmp(name, "dc1sw", length)) {
-			/* Delay DC1SW enablement to avoid overheating. */
-			dc1sw = true;
-			continue;
-		}
 	}
 
 	/*
-	 * If DLDO2 is enabled after DC1SW, the PMIC overheats and shuts
-	 * down. So always enable DC1SW as the very last regulator.
+	 * On the AXP803, if DLDO2 is enabled after DC1SW, the PMIC overheats
+	 * and shuts down. So always enable DC1SW as the very last regulator.
 	 */
-	if (dc1sw) {
-		INFO("PMIC: Enabling DC1SW\n");
+	if (sw) {
+		INFO("PMIC: Enabling DC SW\n");
+		if (axp_chip_id == AXP803_CHIP_ID)
 			axp_setbits(0x12, BIT(7));
+		if (axp_chip_id == AXP805_CHIP_ID)
+			axp_setbits(0x11, BIT(7));
 	}
 }

include/drivers/allwinner/axp.h

@@ -13,6 +13,7 @@
 
 enum {
 	AXP803_CHIP_ID = 0x41,
+	AXP805_CHIP_ID = 0x40,
 };
 
 struct axp_regulator {