1 files changed, 60 insertions, 0 deletions
diff --git a/configs/platform-v7a/patches/barebox-2020.04.0/0002-ARM-stm32mp-lxa-mc1-break-reg_3v3-dependency-on-PMIC.patch b/configs/platform-v7a/patches/barebox-2020.04.0/0002-ARM-stm32mp-lxa-mc1-break-reg_3v3-dependency-on-PMIC.patch
new file mode 100644
index 0000000..451bb7b
--- /dev/null
+++ b/configs/platform-v7a/patches/barebox-2020.04.0/0002-ARM-stm32mp-lxa-mc1-break-reg_3v3-dependency-on-PMIC.patch
@@ -0,0 +1,60 @@
+From: Ahmad Fatoum <a.fatoum@pengutronix.de>
+Date: Thu, 13 Feb 2020 11:10:44 +0100
+Subject: [PATCH] ARM: stm32mp: lxa-mc1: break reg_3v3 dependency on PMIC
+
+While the regulator is indeed powered by the PMIC, basically the whole
+system is, and it's always on. Linux doesn't handle this specially
+however and will defer SDMMC probe till after the PMIC is probed costing
+us some valuable boot time. Fix this up.
+
+Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
+---
+ arch/arm/boards/lxa-mc1/board.c | 29 ++++++++++++++++++++++++++++-
+ 1 file changed, 28 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arm/boards/lxa-mc1/board.c b/arch/arm/boards/lxa-mc1/board.c
+index d36924fc2793..7f1f3ccd7e06 100644
+--- a/arch/arm/boards/lxa-mc1/board.c
++++ b/arch/arm/boards/lxa-mc1/board.c
+@@ -5,6 +5,28 @@
+ #include <asm/memory.h>
+ #include <mach/bbu.h>
+ #include <bootsource.h>
++#include <of.h>
++
++static int of_fixup_regulator_supply_disable(struct device_node *root, void *path)
++{
++	struct device_node *node;
++	struct property *prop;
++
++	node = of_find_node_by_path_from(root, path);
++	if (!node) {
++		pr_warn("fixup for %s failed: not found\n", (const char *)path);
++		return -ENOENT;
++	}
++
++	if (!of_property_read_bool(node, "regulator-always-on"))
++		return 0;
++
++	prop = of_find_property(node, "vin-supply", NULL);
++	if (prop)
++		of_delete_property(prop);
++
++	return 0;
++}
+ 
+ static int mc1_device_init(void)
+ {
+@@ -26,6 +48,11 @@ static int mc1_device_init(void)
+ 
+ 	barebox_set_hostname("lxa-mc1");
+ 
+-	return 0;
++	/* The regulator is powered by the PMIC, but is always on as far as
++	 * software is concerned. Break the reference to the PMIC, so the OS
++	 * doesn't need to defer SDMMC/Ethernet peripherals till after the PMIC
++	 * is up.
++	 */
++	return of_register_fixup(of_fixup_regulator_supply_disable, "/regulator_3v3");
+ }
+ device_initcall(mc1_device_init);