allwinner: PMIC: AXP803: Delay activation of DC1SW switch

There are reports that activating the DC1SW before certain other
regulators leads to the PMIC overheating and consequently shutting down.
To avoid this situation, delay the activation of the DC1SW line until
the very end, so those other lines are always activated earlier.

Signed-off-by: Andre Przywara <[email protected]>

diff --git a/plat/allwinner/sun50i_a64/sunxi_power.c b/plat/allwinner/sun50i_a64/sunxi_power.c
index 9a2733996f2ccfb087324aeafff1eb6a3701dd76..af30477311c085d33fe3fc85e3a7f7b3ce491a57 100644 (file)
--- a/plat/allwinner/sun50i_a64/sunxi_power.c
+++ b/plat/allwinner/sun50i_a64/sunxi_power.c
@@ -217,6 +217,7 @@ static int setup_regulator(const void *fdt, int node,
 static void setup_axp803_rails(const void *fdt)
 {
        int node;
+       bool dc1sw = false;
 
        /* locate the PMIC DT node, bail out if not found */
        node = fdt_node_offset_by_compatible(fdt, -1, "x-powers,axp803");
@@ -252,11 +253,19 @@ static void setup_axp803_rails(const void *fdt)
                }
 
                if (!strncmp(name, "dc1sw", length)) {
-                       INFO("PMIC: AXP803: Enabling DC1SW\n");
-                       axp_setbits(0x12, BIT(7));
+                       /* 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.
+        */
+       if (dc1sw) {
+               INFO("PMIC: AXP803: Enabling DC1SW\n");
+               axp_setbits(0x12, BIT(7));
+       }
 }
 
 int sunxi_pmic_setup(uint16_t socid, const void *fdt)