m1n1: Pass the A9 AOP's boot arguments and sensor calibration

boot/m1n1/patches/orchard/0021-kboot-Pass-the-A9-AOP-s-boot-arguments-and-sensor-ca.patch

@@ -0,0 +1,116 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Berkay=20K=C3=B6sebay?= <brkosebay@users.noreply.github.com>
+Date: Mon, 2 Nov 2026 15:07:08 +0100
+Subject: [PATCH] kboot: Pass the A9 AOP's boot arguments and sensor
+ calibration
+
+The A9's AOP firmware takes more than the ECID from its loader: the AOP
+target number (iop-aop-nub aop-target), the chip's ID (/chosen chip-id)
+and revision (/arm-io chip-revision). Its accelerometer, gyroscope and
+pressure sensor also send no reports until the driver has given them the
+unit's factory calibration, which iBoot resolves from syscfg into the
+sensors' nodes below iop-aop-nub.
+
+Copy the three numbers into the AOP's node (alias aop) as
+apple,aop-target, apple,chip-id and apple,chip-revision, and each
+sensor's calibration properties into the AOP's child node of the same
+name, prefixed with "apple,". Unprovisioned "syscfg/" references and
+nodes the device tree doesn't have are skipped. The orientation
+properties are not copied: the A9 firmware rejects them and the board's
+mount-matrix describes the mounting.
+
+The values are the unit's own and never leave the device: the kernel
+sends them to the AOP and nothing else.
+
+Assisted-by: LLM
+---
+ src/kboot.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 68 insertions(+), 1 deletion(-)
+
+diff --git a/src/kboot.c b/src/kboot.c
+index ebd6282..7ce9d72 100644
+--- a/src/kboot.c
++++ b/src/kboot.c
+@@ -1005,6 +1005,73 @@ static int dt_set_als(void)
+     return 0;
+ }
+
++/*
++ * The A9's AOP firmware also takes the AOP target number and the chip's ID and
++ * revision in its boot arguments, and each motion sensor's factory
++ * calibration, which iBoot resolves from syscfg into the sensor's node below
++ * iop-aop-nub. Copy them into the AOP's node and its sensor child nodes of the
++ * same name; the calibration keeps its name with an "apple," prefix.
++ */
++static const char *const aop_sensor_calibrations[] = {
++    "low-temp-accel-offset",
++    "accel-sensitivity-calibration",
++    "accel-range-sensitivity-cal",
++    "accel-interrupt-calibration",
++    "gyro-sensitivity-calibration",
++    "gyro-range-sensitivity-cal",
++    "gyro-interrupt-calibration",
++    "gyro-trim-calibration",
++    "pressure-offset-calibration",
++    "pressure-accel-sensitivity",
++    "pressure-heater-resistance",
++};
++
++static int dt_set_aop_sensors(int node)
++{
++    int nub = adt_path_offset(adt, "/arm-io/aop/iop-aop-nub");
++    if (nub < 0)
++        return 0;
++
++    u32 val;
++    if (ADT_GETPROP(adt, nub, "aop-target", &val) >= 0 &&
++        fdt_setprop_u32(dt, node, "apple,aop-target", val))
++        bail("FDT: failed to set apple,aop-target\n");
++
++    int chosen = adt_path_offset(adt, "/chosen");
++    if (chosen >= 0 && ADT_GETPROP(adt, chosen, "chip-id", &val) >= 0 &&
++        fdt_setprop_u32(dt, node, "apple,chip-id", val))
++        bail("FDT: failed to set apple,chip-id\n");
++
++    int arm_io = adt_path_offset(adt, "/arm-io");
++    if (arm_io >= 0 && ADT_GETPROP(adt, arm_io, "chip-revision", &val) >= 0 &&
++        fdt_setprop_u32(dt, node, "apple,chip-revision", val))
++        bail("FDT: failed to set apple,chip-revision\n");
++
++    int sensor = nub;
++    ADT_FOREACH_CHILD(adt, sensor)
++    {
++        const char *name = adt_get_name(adt, sensor);
++
++        for (size_t i = 0; i < ARRAY_SIZE(aop_sensor_calibrations); i++) {
++            u32 len;
++            const u8 *blob = adt_getprop(adt, sensor, aop_sensor_calibrations[i], &len);
++            if (!blob || !len || (len >= 7 && !memcmp(blob, "syscfg/", 7)))
++                continue;
++
++            /* Earlier properties may have moved the sensor's node. */
++            int child = fdt_subnode_offset(dt, node, name);
++            if (child < 0)
++                break;
++
++            char prop[64];
++            snprintf(prop, sizeof(prop), "apple,%s", aop_sensor_calibrations[i]);
++            if (fdt_setprop(dt, child, prop, blob, len))
++                bail("FDT: failed to set %s/%s\n", name, prop);
++        }
++    }
++    return 0;
++}
++
+ /*
+  * The AOP's firmware carries the chip's ECID in its boot arguments. Pass it
+  * only to the AOP's node; the driver removes it from the tree once read.
+@@ -1028,7 +1095,7 @@ static int dt_set_aop(void)
+
+     if (fdt_setprop_u64(dt, node, "apple,ecid", ecid))
+         bail("FDT: failed to set apple,ecid\n");
+-    return 0;
++    return dt_set_aop_sensors(node);
+ }
+
+ static int dt_set_multitouch(void)