linux-kernel - [RFC PATCH 1/9] i3c: add actual in i3c_priv

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Message-Id: <20230905213842.3035779-2-Frank.Li@nxp.com>
Date:   Tue,  5 Sep 2023 17:38:34 -0400
From:   Frank Li <Frank.Li@....com>
To:     miquel.raynal@...tlin.com
Cc:     Frank.Li@....com, alexandre.belloni@...tlin.com,
        conor.culhane@...vaco.com, imx@...ts.linux.dev,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/9] i3c: add actual in i3c_priv_xfer

In MIPI I3C Specification:

"Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
ninth Data bit from Target to Controller is an ACK by the Controller. By
contrast, in I3C this bit allows the Target to end a Read, and allows the
Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
referred to as the T-Bit (for ‘Transition’)"

I3C allow devices early terminate data transfer. So need "actual" field to
indicate how much get by i3c_priv_xfer.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 include/linux/i3c/device.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index 90fa83464f003..f2fa7ee5d96d9 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -66,6 +66,7 @@ struct i3c_priv_xfer {
 		void *in;
 		const void *out;
 	} data;
+	u16 actual;
 	enum i3c_error_code err;
 };

-- 
2.34.1