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Sat, 10 May 2025 08:58:31 -0700 (PDT) Received: from localhost.localdomain ([223.181.104.76]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-30ad4ffb6f1sm5884178a91.47.2025.05.10.08.58.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 May 2025 08:58:31 -0700 (PDT) From: Viswanath To: linux-i2c@vger.kernel.org Cc: Viswanath Subject: [PATCH v2] i2c: Clarify behavior of I2C_M_RD flag Date: Sun, 11 May 2025 02:57:21 +0530 Message-ID: <20250510212721.29829-1-viswanathiyyappan@gmail.com> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Update the description of I2C_M_RD to clarify that not setting it signals a write transaction Signed-off-by: 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 aa751389de07..29b149ca4b70 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 sense only