linux-kernel - [PATCH RFC 1/2] Documentation: devicetree: Add property for ignoring the dummy bits sent before read transfer

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Message-ID: <20201209175708.16252-2-a-govindraju@ti.com>
Date:   Wed, 9 Dec 2020 23:27:07 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>,
        Vignesh Raghavendra <vigneshr@...com>,
        Sekhar Nori <nsekhar@...com>,
        Aswath Govindraju <a-govindraju@...com>
Subject: [PATCH RFC 1/2] Documentation: devicetree: Add property for ignoring the dummy bits sent before read transfer

Dummy zero bits are sent before data during a read transfer. This causes
the data read to be shifted to the right. To fix this send zero bits after
the address during a read transfer.

Add property to send zero bits after the address during a read transfer.

Suggested-by: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Aswath Govindraju <a-govindraju@...com>
---
 Documentation/devicetree/bindings/misc/eeprom-93xx46.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
index a8ebb4621f79..09fb1cec54f0 100644
--- a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
+++ b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
@@ -10,7 +10,9 @@ Optional properties:
 - read-only : parameter-less property which disables writes to the EEPROM
 - select-gpios : if present, specifies the GPIO that will be asserted prior to
   each access to the EEPROM (e.g. for SPI bus multiplexing)
-
+- read-op-dummy-cycles: If present specifies the number of dummy zero-bits to
+  be sent after the address during a read transfer to ignore any bits sent
+  preceding the data.
 Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
 apply.  In particular, "reg" and "spi-max-frequency" properties must be given.
 
-- 
2.17.1