linux-kernel - [PATCH 1/2] of/fdt: add of_fdt_device_is

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Date:   Tue,  3 Oct 2017 11:18:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: [PATCH 1/2] of/fdt: add of_fdt_device_is_available function

Add an equivalent function to of_device_is_available for flattened DT, and
convert the one existing open coded occurrence.

Cc: Nicolas Pitre <nicolas.pitre@...aro.org>
Cc: Frank Rowand <frowand.list@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/of/fdt.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 27c535af0be8..f8c39705418b 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -132,6 +132,19 @@ bool of_fdt_is_big_endian(const void *blob, unsigned long node)
 	return false;
 }
 
+static bool of_fdt_device_is_available(const void *blob, unsigned long node)
+{
+	const char *status = fdt_getprop(blob, node, "status", NULL);
+
+	if (!status)
+		return true;
+
+	if (!strcmp(status, "ok") || !strcmp(status, "okay"))
+		return true;
+
+	return false;
+}
+
 /**
  * of_fdt_match - Return true if node matches a list of compatible values
  */
@@ -605,7 +618,6 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
 					  int depth, void *data)
 {
 	static int found;
-	const char *status;
 	int err;
 
 	if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
@@ -625,8 +637,7 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
 		return 1;
 	}
 
-	status = of_get_flat_dt_prop(node, "status", NULL);
-	if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
+	if (!of_fdt_device_is_available(initial_boot_params, node))
 		return 0;
 
 	err = __reserved_mem_reserve_reg(node, uname);
-- 
2.11.0