linux-kernel - [PATCH v1 1/8] i2c: Introduce i2c_10bit_addr_from

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Message-ID: <20250212163359.2407327-2-andriy.shevchenko@linux.intel.com>
Date: Wed, 12 Feb 2025 18:32:26 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-renesas-soc@...r.kernel.org
Cc: Krzysztof Adamski <krzysztof.adamski@...ia.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Stefan Roese <sr@...x.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Subject: [PATCH v1 1/8] i2c: Introduce i2c_10bit_addr_from_msg()

There are already a lot of drivers that have been using
i2c_8bit_addr_from_msg() for 7-bit addresses, now it's time
to have the similar for 10-bit addresses.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/i2c.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 997e80649889..4d281ff5582b 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -952,6 +952,16 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
 	return (msg->addr << 1) | (msg->flags & I2C_M_RD);
 }
 
+static inline u8 i2c_10bit_addr_from_msg(const struct i2c_msg *msg)
+{
+	/*
+	 * 10-bit address
+	 *   addr_1: 5'b11110 | addr[9:8] | (R/nW)
+	 *   addr_2: addr[7:0]
+	 */
+	return 0xf0 | ((msg->addr & GENMASK(9, 8)) >> 7) | (msg->flags & I2C_M_RD);
+}
+
 u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
 void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred);
 
-- 
2.45.1.3035.g276e886db78b