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Wed, 09 Jul 2025 08:02:21 -0700 (PDT) Received: from localhost.localdomain ([223.181.118.20]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23c84351ae4sm143349455ad.72.2025.07.09.08.02.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jul 2025 08:02:20 -0700 (PDT) From: I Viswanath To: wsa+renesas@sang-engineering.com Cc: linux-i2c@vger.kernel.org, viswanathiyyappan@gmail.com Subject: [PATCH v3] i2c: Clarify behavior of I2C_M_RD flag Date: Wed, 9 Jul 2025 20:30:50 +0530 Message-ID: <20250709150203.7199-2-viswanathiyyappan@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250709150203.7199-1-viswanathiyyappan@gmail.com> References: <20250709150203.7199-1-viswanathiyyappan@gmail.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Update the description of I2C_M_RD to clarify that not setting it signals a write transaction Signed-off-by: I Viswanath --- include/uapi/linux/i2c.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h index 92326ebde350..a2db2a56c8b0 100644 --- a/include/uapi/linux/i2c.h +++ b/include/uapi/linux/i2c.h @@ -21,7 +21,8 @@ * * @flags: * Supported by all adapters: - * %I2C_M_RD: read data (from slave to master). Guaranteed to be 0x0001! + * %I2C_M_RD: read data (from slave to master). Guaranteed to be 0x0001! If + * not set, the transaction is interpreted as write. * * Optional: * %I2C_M_DMA_SAFE: the buffer of this message is DMA safe. Makes only sense -- 2.49.0