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From:   Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        bcm-kernel-feedback-list@broadcom.com
Cc:     Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Subject: [PATCH v1 1/1] scripts: dtc: mask flags bit when check i2c addr
Date:   Fri, 28 Feb 2020 14:18:42 +0530
Message-Id: <20200228084842.18691-1-rayagonda.kokatanur@broadcom.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Generally i2c addr should not be greater than 10-bit. The highest 2 bits
are used for I2C_TEN_BIT_ADDRESS and I2C_OWN_SLAVE_ADDRESS. Need to mask
these flags if check slave addr valid.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
---
 scripts/dtc/Makefile | 2 +-
 scripts/dtc/checks.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 3acbb410904c..c5e8d6a9e73c 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -9,7 +9,7 @@ dtc-objs	:= dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
 dtc-objs	+= dtc-lexer.lex.o dtc-parser.tab.o
 
 # Source files need to get at the userspace version of libfdt_env.h to compile
-HOST_EXTRACFLAGS := -I $(srctree)/$(src)/libfdt
+HOST_EXTRACFLAGS := -I $(srctree)/$(src)/libfdt -I$(srctree)/tools/include
 
 ifeq ($(shell pkg-config --exists yaml-0.1 2>/dev/null && echo yes),)
 ifneq ($(CHECK_DTBS),)
diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
index 756f0fa9203f..17c9ed4137b5 100644
--- a/scripts/dtc/checks.c
+++ b/scripts/dtc/checks.c
@@ -3,6 +3,7 @@
  * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2007.
  */
 
+#include <linux/bits.h>
 #include "dtc.h"
 #include "srcpos.h"
 
@@ -17,6 +18,9 @@
 #define TRACE(c, fmt, ...)	do { } while (0)
 #endif
 
+#define I2C_TEN_BIT_ADDRESS    BIT(31)
+#define I2C_OWN_SLAVE_ADDRESS  BIT(30)
+
 enum checkstatus {
 	UNCHECKED = 0,
 	PREREQ,
@@ -1048,6 +1052,7 @@ static void check_i2c_bus_reg(struct check *c, struct dt_info *dti, struct node
 
 	for (len = prop->val.len; len > 0; len -= 4) {
 		reg = fdt32_to_cpu(*(cells++));
+		reg &= ~(I2C_OWN_SLAVE_ADDRESS | I2C_TEN_BIT_ADDRESS);
 		if (reg > 0x3ff)
 			FAIL_PROP(c, dti, node, prop, "I2C address must be less than 10-bits, got \"0x%x\"",
 				  reg);
-- 
2.17.1