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Disable CM5's RTC to make Yellow's on-board RTC the primary one (#3706)

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With both RTCs enabled, the rpi_rtc is probed as the first one, making the
on-board RTC unused by default. Since the CM5's RTC peripheral can't be used on
Yellow, as the VBAT pin is not connected, disable it completely to fix RTC.
This commit is contained in:
Jan Čermák 2024-12-02 17:47:40 +01:00 committed by GitHub
parent e0ccf398f2
commit 9d643edb54
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1 changed files with 32 additions and 0 deletions
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buildroot-external/board/raspberrypi/yellow/patches/linux/0020-ARM-dts-bcm2712-yellow-Disable-rpi_rtc.patch Normal file
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@ -0,0 +1,32 @@
From fc558b6a7174e2b5c37936dd8c13ca29e9273472 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Mon, 2 Dec 2024 17:22:04 +0100
Subject: [PATCH] ARM: dts: bcm2712: yellow: Disable rpi_rtc
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Yellow has its own I2C RTC and there is no way to power the new peripheral on
CM5.
Signed-off-by: Jan Čermák <sairon@sairon.cz>
---
arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
index 469d0fdc971a8..ebdeef5f89881 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
@@ -927,6 +927,11 @@ &i2c1 {
clock-frequency = <100000>;
};
+/* No way to power CM5's VBAT pin on Yellow, disable its RTC. */
+&rpi_rtc {
+ status = "disabled";
+};
+
/* Board-level I2C (RTC and I2S audio) */
&rp1_i2c3 {
pinctrl-names = "default";