linux-kernel - [PATCH v3 0/3] spi: s3c64xx: add support exynos990-spi to new port config data

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Message-Id: <20250214043343.263-1-wachiturroxd150@gmail.com>
Date: Fri, 14 Feb 2025 04:33:40 +0000
From: Denzeel Oliva <wachiturroxd150@...il.com>
To: andi.shyti@...nel.org,
	broonie@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com,
	linux-spi@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Denzeel Oliva <wachiturroxd150@...il.com>
Subject: [PATCH v3 0/3] spi: s3c64xx: add support exynos990-spi to new port config data

Exynos990 uses the same version of USI SPI (v2.1) as the GS101.
Removed fifo_lvl_mask and rx_lvl_offset, and changed to the new data
configuration port.

The difference from other new port configuration data is that fifo_depth
is only specified in fifo-depth in DT.

Exynos 990 data for SPI:
- The depth of the FIFO is not the same size on all nodes.
  A depth of 64 bytes is used on most nodes,
  while a depth of 256 bytes is used on 3 specific nodes (SPI 8/9/10).
- The Exynos 990 only allows access to 32-bit registers.
  If access is attempted with a different size, an error interrupt
  is generated. Therefore, it is necessary to perform write accesses to
  registers in 32-bit blocks.

Changes in v2:
- Added a default "fifo_depth = 64" to prevent crashes when "fifo-depth"
  is missing in the device tree (avoids divide-by-zero issues).
- No other functional changes.

Changes in v3:
- Reordered fifo_depth handling in s3c64xx_spi_probe() so that the DT
  property takes precedence over the default value in port_config.
  This allows node-specific FIFO depths to be applied correctly while
  preserving a fallback.

Denzeel Oliva (3):
  spi: dt-bindings: samsung: add samsung,exynos990-spi compatible
  spi: s3c64xx: prioritize fifo-depth from DT over port_config
  spi: s3c64xx: add support exynos990-spi to new port config data

 .../devicetree/bindings/spi/samsung,spi.yaml  |  1 +
 drivers/spi/spi-s3c64xx.c                     | 29 +++++++++++++++----
 2 files changed, 25 insertions(+), 5 deletions(-)

-- 
2.48.1