soc: bcm: bcm2835-pm: Add support for power domains under a new binding.

This provides a free software alternative to raspberrypi-power.c's
firmware calls to manage power domains.  It also exposes a reset line,
where previously the vc4 driver had to try to force power off the
domain in order to trigger a reset.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>

2 files changed, 29 insertions, 0 deletions

diff --git a/include/dt-bindings/soc/bcm2835-pm.h b/include/dt-bindings/soc/bcm2835-pm.h
new file mode 100644
index 000000000000..153d75b8d99f
--- /dev/null
+++ b/include/dt-bindings/soc/bcm2835-pm.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+
+#ifndef _DT_BINDINGS_ARM_BCM2835_PM_H
+#define _DT_BINDINGS_ARM_BCM2835_PM_H
+
+#define BCM2835_POWER_DOMAIN_GRAFX              0
+#define BCM2835_POWER_DOMAIN_GRAFX_V3D          1
+#define BCM2835_POWER_DOMAIN_IMAGE              2
+#define BCM2835_POWER_DOMAIN_IMAGE_PERI         3
+#define BCM2835_POWER_DOMAIN_IMAGE_ISP          4
+#define BCM2835_POWER_DOMAIN_IMAGE_H264         5
+#define BCM2835_POWER_DOMAIN_USB                6
+#define BCM2835_POWER_DOMAIN_DSI0               7
+#define BCM2835_POWER_DOMAIN_DSI1               8
+#define BCM2835_POWER_DOMAIN_CAM0               9
+#define BCM2835_POWER_DOMAIN_CAM1               10
+#define BCM2835_POWER_DOMAIN_CCP2TX             11
+#define BCM2835_POWER_DOMAIN_HDMI               12
+
+#define BCM2835_POWER_DOMAIN_COUNT              13
+
+#define BCM2835_RESET_V3D                       0
+#define BCM2835_RESET_ISP                       1
+#define BCM2835_RESET_H264                      2
+
+#define BCM2835_RESET_COUNT                     3
+
+#endif /* _DT_BINDINGS_ARM_BCM2835_PM_H */
diff --git a/include/linux/mfd/bcm2835-pm.h b/include/linux/mfd/bcm2835-pm.h
index b7d0ee1feffa..ed37dc40e82a 100644
--- a/include/linux/mfd/bcm2835-pm.h
+++ b/include/linux/mfd/bcm2835-pm.h
@@ -8,6 +8,7 @@
 struct bcm2835_pm {
         struct device *dev;
         void __iomem *base;
+        void __iomem *asb;
 };
 
 #endif /* BCM2835_MFD_PM_H */