[PATCH v1 2/2] spi: s3c64xx: add support exynos990-spi to new port config data

Denzeel Oliva
2025-02-12T19:13:08Z

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.

Signed-off-by: Denzeel Oliva <wachiturroxd150@gmail.com>
---
drivers/spi/spi-s3c64xx.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 389275dbc..790034d2d 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1586,6 +1586,20 @@ static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
.quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
};

+static const struct s3c64xx_spi_port_config exynos990_spi_port_config = {
+ /* fifo-depth must be specified in the device tree. */
+ .fifo_depth = 0,
+ .rx_fifomask = S3C64XX_SPI_ST_RX_FIFO_RDY_V2,
+ .tx_fifomask = S3C64XX_SPI_ST_TX_FIFO_RDY_V2,
+ .tx_st_done = 25,
+ .clk_div = 4,
+ .high_speed = true,
+ .clk_from_cmu = true,
+ .has_loopback = true,
+ .use_32bit_io = true,
+ .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
+};
+
static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
/* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
.fifo_lvl_mask = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
@@ -1664,6 +1678,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
{ .compatible = "samsung,exynos850-spi",
.data = &exynos850_spi_port_config,
},
+ { .compatible = "samsung,exynos990-spi",
+ .data = &exynos990_spi_port_config,
+ },
{ .compatible = "samsung,exynosautov9-spi",
.data = &exynosautov9_spi_port_config,
},
--
2.48.1