linux-kernel - [PATCH 2/9] mtd: add mtd_is

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Message-Id: <20240701-b4-v6-10-topic-usbc-tcpci-v1-2-3fd5f4a193cc@pengutronix.de>
Date: Mon, 01 Jul 2024 15:53:41 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Russell King <linux@...linux.org.uk>, 
 Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Vladimir Zapolskiy <vz@...ia.com>, 
 Andrew Lunn <andrew@...n.ch>, Gregory Clement <gregory.clement@...tlin.com>, 
 Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, 
 Tony Lindgren <tony@...mide.com>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, Dinh Nguyen <dinguyen@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Jonathan Neuschäfer <j.neuschaefer@....net>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, imx@...ts.linux.dev, 
 linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 linux-tegra@...r.kernel.org, openbmc@...ts.ozlabs.org, 
 linuxppc-dev@...ts.ozlabs.org, linux-mips@...r.kernel.org, 
 loongarch@...ts.linux.dev, Marco Felsch <m.felsch@...gutronix.de>
Subject: [PATCH 2/9] mtd: add mtd_is_master helper

Provide a simple helper to make it easy to detect an master mtd device.

Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 include/linux/mtd/mtd.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 8d10d9d2e830..bf3fc2ea7230 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -408,6 +408,11 @@ static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
 	return mtd;
 }

+static inline bool mtd_is_master(struct mtd_info *mtd)
+{
+	return mtd->parent ? false : true;
+}
+
 static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs)
 {
 	while (mtd->parent) {

-- 
2.39.2