From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: srinivas.kandagatla@linaro.org, linux-kernel@vger.kernel.org,
Rob Herring <robh+dt@kernel.org>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk,
catalin.marinas@arm.com, will@kernel.org,
devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com, tim.gover@raspberrypi.com,
phil@raspberrypi.com
Subject: [PATCH v2 3/5] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration
Date: Fri, 18 Dec 2020 16:43:18 +0100 [thread overview]
Message-ID: <20201218154320.28368-4-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20201218154320.28368-1-nsaenzjulienne@suse.de>
RPi4's co-processor will copy the board's bootloader[1] configuration
into memory for the OS to consume. Specifically, for the bootloader
configuration and upgrade user-space routines to query it through
nvmem's sysfs interface.
Introduce a reserved-memory area template for the co-processor to edit
before booting the system so as for Linux not to overwrite that memory
and to expose it as an nvmem device.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
[1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
---
Changes since v1:
- Introduce compatible string
- Change alias name to something more explicit
arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 403bacf986eb..3b4ab947492a 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -25,6 +25,7 @@ aliases {
emmc2bus = &emmc2bus;
ethernet0 = &genet;
pcie0 = &pcie0;
+ blconfig = &blconfig;
};
leds {
@@ -218,6 +219,22 @@ &pwm1 {
status = "okay";
};
+&rmem {
+ /*
+ * RPi4's co-processor will copy the board's bootloader configuration
+ * into memory for the OS to consume. It'll also update this node with
+ * its placement information.
+ */
+ blconfig: nvram@0 {
+ compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ reg = <0x0 0x0 0x0>;
+ no-map;
+ status = "disabled";
+ };
+};
+
/* SDHCI is used to control the SDIO for wireless */
&sdhci {
#address-cells = <1>;
--
2.29.2
next prev parent reply other threads:[~2020-12-18 15:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 15:43 [PATCH v2 0/5] Expose RPi4's bootloader configuration Nicolas Saenz Julienne
2020-12-18 15:43 ` [PATCH v2 1/5] dt-bindings: nvmem: Add bindings for rmem driver Nicolas Saenz Julienne
2020-12-21 16:10 ` Rob Herring
2020-12-18 15:43 ` [PATCH v2 2/5] nvmem: Add driver to expose reserved memory as nvmem Nicolas Saenz Julienne
2021-01-03 16:16 ` Rob Herring
2020-12-18 15:43 ` Nicolas Saenz Julienne [this message]
2020-12-18 15:43 ` [PATCH v2 4/5] arm64: defconfig: Enable nvmem's rmem driver Nicolas Saenz Julienne
2020-12-18 15:43 ` [PATCH v2 5/5] ARM: multi_v7_defconfig: " Nicolas Saenz Julienne
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201218154320.28368-4-nsaenzjulienne@suse.de \
--to=nsaenzjulienne@suse.de \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=catalin.marinas@arm.com \
--cc=devicetree@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rpi-kernel@lists.infradead.org \
--cc=linux@armlinux.org.uk \
--cc=phil@raspberrypi.com \
--cc=robh+dt@kernel.org \
--cc=srinivas.kandagatla@linaro.org \
--cc=tim.gover@raspberrypi.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).