linux-kernel - [PATCH v2] spi: Raise limit on number of chip selects

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Message-Id: <20240124-spi-multi-cs-max-v2-1-df6fc5ab1abc@kernel.org>
Date: Wed, 24 Jan 2024 13:24:24 +0000
From: Mark Brown <broonie@...nel.org>
To: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>, 
 Guenter Roeck <linux@...ck-us.net>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH v2] spi: Raise limit on number of chip selects

As reported by Guenter the limit we've got on the number of chip selects is
set too low for some systems, raise the limit. We should really remove the
hard coded limit but this is needed as a fix so let's do the simple thing
and raise the limit for now.

Fixes: 4d8ff6b0991d ("spi: Add multi-cs memories support in SPI core")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Suggested-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v2:
- Raise the limit further, the highest I've seen thus far is 12.
- Link to v1: https://lore.kernel.org/r/20240122-spi-multi-cs-max-v1-1-a7e98cd5f6c7@kernel.org
---
 include/linux/spi/spi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 471fe2ff9066..600fbd5daf68 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -21,7 +21,7 @@
 #include <uapi/linux/spi/spi.h>
 
 /* Max no. of CS supported per spi device */
-#define SPI_CS_CNT_MAX 4
+#define SPI_CS_CNT_MAX 16
 
 struct dma_chan;
 struct software_node;

---
base-commit: 65163d16fcaef37733b5f273ffe4d00d731b34de
change-id: 20240121-spi-multi-cs-max-23e82c815c6d

Best regards,
-- 
Mark Brown <broonie@...nel.org>