openwrt/target/linux/brcm2708/patches-4.19/950-0727-bcm2711-Retain-support-for-old-dtbs.patch

From 7d7f6a80f12fb6e7ba903d070512970e304bcd02 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 9 Oct 2019 17:22:07 +0100
Subject: [PATCH] bcm2711: Retain support for old dtbs

The recent series switching to bcm2711 as the DT identifier broke Pis
running with old DTBs. Add some bcm2838 compatible strings as a
temporary measure, at least until the next full Raspbian image with
bcm2711 DTBs.

See: https://github.com/raspberrypi/linux/pull/3244

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/mach-bcm/board_bcm2835.c     | 2 ++
 drivers/clk/bcm/clk-bcm2835.c         | 2 ++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 5 +++++
 3 files changed, 9 insertions(+)

--- a/arch/arm/mach-bcm/board_bcm2835.c
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -119,6 +119,8 @@ static const char * const bcm2835_compat
 	"brcm,bcm2836",
 	"brcm,bcm2837",
 	"brcm,bcm2711",
+	// Temporary, for backwards-compatibility with old DTBs
+	"brcm,bcm2838",
 #endif
 	NULL
 };
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -2396,6 +2396,8 @@ static const struct cprman_plat_data cpr
 static const struct of_device_id bcm2835_clk_of_match[] = {
 	{ .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data },
 	{ .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data },
+	// Temporary, for backwards-compatibility with old DTBs
+	{ .compatible = "brcm,bcm2838-cprman", .data = &cprman_bcm2711_plat_data },
 	{}
 };
 MODULE_DEVICE_TABLE(of, bcm2835_clk_of_match);
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -1079,6 +1079,11 @@ static const struct of_device_id bcm2835
 		.compatible = "brcm,bcm2711-gpio",
 		.data = &bcm2711_pinconf_ops,
 	},
+	// Temporary, for backwards-compatibility with old DTBs
+	{
+		.compatible = "brcm,bcm2838-gpio",
+		.data = &bcm2711_pinconf_ops,
+	},
 	{}
 };