From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/powerpc/sysdev/of_rtc.c | 59 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 arch/powerpc/sysdev/of_rtc.c

(limited to 'arch/powerpc/sysdev/of_rtc.c')

diff --git a/arch/powerpc/sysdev/of_rtc.c b/arch/powerpc/sysdev/of_rtc.c
new file mode 100644
index 000000000..420f949b7
--- /dev/null
+++ b/arch/powerpc/sysdev/of_rtc.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Instantiate mmio-mapped RTC chips based on device tree information
+ *
+ * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
+ */
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+#include <asm/prom.h>
+
+static __initdata struct {
+	const char *compatible;
+	char *plat_name;
+} of_rtc_table[] = {
+	{ "ds1743-nvram", "rtc-ds1742" },
+};
+
+void __init of_instantiate_rtc(void)
+{
+	struct device_node *node;
+	int err;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
+		char *plat_name = of_rtc_table[i].plat_name;
+
+		for_each_compatible_node(node, NULL,
+					 of_rtc_table[i].compatible) {
+			struct resource *res;
+
+			res = kmalloc(sizeof(*res), GFP_KERNEL);
+			if (!res) {
+				printk(KERN_ERR "OF RTC: Out of memory "
+				       "allocating resource structure for %pOF\n",
+				       node);
+				continue;
+			}
+
+			err = of_address_to_resource(node, 0, res);
+			if (err) {
+				printk(KERN_ERR "OF RTC: Error "
+				       "translating resources for %pOF\n",
+				       node);
+				continue;
+			}
+
+			printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
+			       node, plat_name,
+			       (unsigned long long)res->start,
+			       (unsigned long long)res->end);
+			platform_device_register_simple(plat_name, -1, res, 1);
+		}
+	}
+}
-- 
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