linux-kernel - [PATCH 2/9] spi: core: Add flag for controllers that can't hold cs between transfers

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Date:   Tue, 24 Aug 2021 11:40:34 +0100
From:   Lucas Tanure <tanureal@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Sanjay R Mehta <sanju.mehta@....com>,
        Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>
CC:     <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Lucas Tanure <tanureal@...nsource.cirrus.com>
Subject: [PATCH 2/9] spi: core: Add flag for controllers that can't hold cs between transfers

Create a flag for a controller that has an automatic cs selection and
can't hold cs activated between transfers
Some messages send address and data split between two transfers, see
regmap-spi, and without the cs held the data loses it`s meaning

Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
---
 include/linux/spi/spi.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 8371bca13729..f5b55c237634 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -514,6 +514,7 @@ struct spi_controller {
 #define SPI_CONTROLLER_MUST_TX		BIT(4)	/* requires tx */
 
 #define SPI_MASTER_GPIO_SS		BIT(5)	/* GPIO CS must select slave */
+#define SPI_CONTROLLER_CS_PER_TRANSFER	BIT(6)	/* SPI controller can not hold CS between transfers */
 
 	/* flag indicating if the allocation of this struct is devres-managed */
 	bool			devm_allocated;
-- 
2.33.0