spi: s3c64xx: add support for google,gs101-spi

Add support for GS101 SPI. GS101 integrates 16 SPI nodes, all with 64
bytes FIFOs. GS101 allows just 32 bit register accesses, otherwise a
Serror Interrupt is raised. Do the write reg accesses in 32 bits.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240207111516.2563218-5-tudor.ambarus@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 014fcc933c90525543aed7b137917dc0897ace84..7ab3f3c2e9aab54da6db921fdadfb87f946b2340 100644 (file)
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -17,7 +17,7 @@
 
 #include <linux/platform_data/spi-s3c64xx.h>
 
-#define MAX_SPI_PORTS          12
+#define MAX_SPI_PORTS          16
 #define S3C64XX_SPI_QUIRK_CS_AUTO      (1 << 1)
 #define AUTOSUSPEND_TIMEOUT    2000
 
@@ -1534,6 +1534,19 @@ static const struct s3c64xx_spi_port_config fsd_spi_port_config = {
        .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
 };
 
+static const struct s3c64xx_spi_port_config gs101_spi_port_config = {
+       .fifo_lvl_mask  = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f,
+                           0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
+       .rx_lvl_offset  = 15,
+       .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 platform_device_id s3c64xx_spi_driver_ids[] = {
        {
                .name           = "s3c2443-spi",
@@ -1546,6 +1559,9 @@ static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
 };
 
 static const struct of_device_id s3c64xx_spi_dt_match[] = {
+       { .compatible = "google,gs101-spi",
+                       .data = &gs101_spi_port_config,
+       },
        { .compatible = "samsung,s3c2443-spi",
                        .data = (void *)&s3c2443_spi_port_config,
        },