linux-kernel - [PATCH] [RFC] mtd: fixup CFI on ixp4xx

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Date:   Mon, 27 Sep 2021 16:10:37 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     Linus Walleij <linusw@...nel.org>, Imre Kaloz <kaloz@...nwrt.org>,
        Krzysztof Halasa <khalasa@...p.pl>,
        Arnd Bergmann <arnd@...db.de>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [RFC] mtd: fixup CFI on ixp4xx

From: Arnd Bergmann <arnd@...db.de>

drivers/mtd/maps/ixp4xx.c requires MTD_CFI_BE_BYTE_SWAP to be set
in order to compile.

drivers/mtd/maps/ixp4xx.c:57:4: error: #error CONFIG_MTD_CFI_BE_BYTE_SWAP required

This patch avoids the #error output by enforcing the policy in
Kconfig. Not sure if this is the right approach, but it helps doing
randconfig builds.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
Any other ideas for how to address it?
---
 drivers/mtd/chips/Kconfig | 2 ++
 drivers/mtd/maps/Kconfig  | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/chips/Kconfig b/drivers/mtd/chips/Kconfig
index aef14990e5f7..19726ebd973d 100644
--- a/drivers/mtd/chips/Kconfig
+++ b/drivers/mtd/chips/Kconfig
@@ -55,12 +55,14 @@ choice
 	  LITTLE_ENDIAN_BYTE, if the bytes are reversed.
 
 config MTD_CFI_NOSWAP
+	depends on !ARCH_IXP4XX || CPU_BIG_ENDIAN
 	bool "NO"
 
 config MTD_CFI_BE_BYTE_SWAP
 	bool "BIG_ENDIAN_BYTE"
 
 config MTD_CFI_LE_BYTE_SWAP
+	depends on !ARCH_IXP4XX
 	bool "LITTLE_ENDIAN_BYTE"
 
 endchoice
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index aaa164b977fe..4945caa88345 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -302,7 +302,7 @@ config MTD_DC21285
 
 config MTD_IXP4XX
 	tristate "CFI Flash device mapped on Intel IXP4xx based systems"
-	depends on MTD_CFI && MTD_COMPLEX_MAPPINGS && ARCH_IXP4XX
+	depends on MTD_CFI && MTD_COMPLEX_MAPPINGS && ARCH_IXP4XX && MTD_CFI_ADV_OPTIONS
 	help
 	  This enables MTD access to flash devices on platforms based
 	  on Intel's IXP4xx family of network processors such as the
-- 
2.29.2