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Date:   Tue, 19 Jul 2022 16:53:17 -0300
From:   "Guilherme G. Piccoli" <>
Cc:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, "Guilherme G. Piccoli" <>,,
        Brian Norris <>,
        Doug Berger <>,
        Justin Chen <>,
        Lee Jones <>,
        Markus Mayer <>,
        Florian Fainelli <>
Subject: [PATCH v2 04/13] soc: bcm: brcmstb: Document panic notifier action and remove useless header

The panic notifier of this driver is very simple code-wise, just a
memory write to a special position with some numeric code. But this
is not clear from the semantic point-of-view, and there is no public
documentation about that either.

After discussing this in the mailing-lists [0] and having Florian
explained it very well, document that in the code for the future
generations asking the same questions. Also, while at it, remove
a useless header.


Cc: Brian Norris <>
Cc: Doug Berger <>
Cc: Justin Chen <>
Cc: Lee Jones <>
Cc: Markus Mayer <>
Acked-by: Florian Fainelli <>
Signed-off-by: Guilherme G. Piccoli <>


- Removed the Fixes tag;
- Added Florian's ACK - thanks!

 drivers/soc/bcm/brcmstb/pm/pm-arm.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/bcm/brcmstb/pm/pm-arm.c b/drivers/soc/bcm/brcmstb/pm/pm-arm.c
index 70ad0f3dce28..2a6adaa29596 100644
--- a/drivers/soc/bcm/brcmstb/pm/pm-arm.c
+++ b/drivers/soc/bcm/brcmstb/pm/pm-arm.c
@@ -25,7 +25,6 @@
 #include <linux/kernel.h>
 #include <linux/memblock.h>
 #include <linux/module.h>
-#include <linux/notifier.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/panic_notifier.h>
@@ -664,7 +663,20 @@ static void __iomem *brcmstb_ioremap_match(const struct of_device_id *matches,
 	return of_io_request_and_map(dn, index, dn->full_name);
+ * The AON is a small domain in the SoC that can retain its state across
+ * various system wide sleep states and specific reset conditions; the
+ * AON DATA RAM is a small RAM of a few words (< 1KB) which can store
+ * persistent information across such events.
+ *
+ * The purpose of the below panic notifier is to help with notifying
+ * the bootloader that a panic occurred and so that it should try its
+ * best to preserve the DRAM contents holding that buffer for recovery
+ * by the kernel as opposed to wiping out DRAM clean again.
+ *
+ * Reference: comment from Florian Fainelli, at
+ *
+ */
 static int brcmstb_pm_panic_notify(struct notifier_block *nb,
 		unsigned long action, void *data)

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