spi: sh-msiof: Enforce fixed DTDL for R-Car H3

[ Upstream commit e5c7bcb499840551cfbe85c6df177ebc50432bf0 ]

Documentation says only DTDL of 200 is allowed for this SoC.

Fixes: 4286db8456f4 ("spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://msgid.link/r/20231212081239.14254-1-wsa+renesas@sang-engineering.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index fb452bc..cfc3b1d 100644 (file)
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -29,12 +29,15 @@
 
 #include <asm/unaligned.h>
 
+#define SH_MSIOF_FLAG_FIXED_DTDL_200   BIT(0)
+
 struct sh_msiof_chipdata {
        u32 bits_per_word_mask;
        u16 tx_fifo_size;
        u16 rx_fifo_size;
        u16 ctlr_flags;
        u16 min_div_pow;
+       u32 flags;
 };
 
 struct sh_msiof_spi_priv {
@@ -1072,6 +1075,16 @@ static const struct sh_msiof_chipdata rcar_gen3_data = {
        .min_div_pow = 1,
 };
 
+static const struct sh_msiof_chipdata rcar_r8a7795_data = {
+       .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) |
+                             SPI_BPW_MASK(24) | SPI_BPW_MASK(32),
+       .tx_fifo_size = 64,
+       .rx_fifo_size = 64,
+       .ctlr_flags = SPI_CONTROLLER_MUST_TX,
+       .min_div_pow = 1,
+       .flags = SH_MSIOF_FLAG_FIXED_DTDL_200,
+};
+
 static const struct of_device_id sh_msiof_match[] __maybe_unused = {
        { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
        { .compatible = "renesas,msiof-r8a7743",   .data = &rcar_gen2_data },
@@ -1082,6 +1095,7 @@ static const struct of_device_id sh_msiof_match[] __maybe_unused = {
        { .compatible = "renesas,msiof-r8a7793",   .data = &rcar_gen2_data },
        { .compatible = "renesas,msiof-r8a7794",   .data = &rcar_gen2_data },
        { .compatible = "renesas,rcar-gen2-msiof", .data = &rcar_gen2_data },
+       { .compatible = "renesas,msiof-r8a7795",   .data = &rcar_r8a7795_data },
        { .compatible = "renesas,msiof-r8a7796",   .data = &rcar_gen3_data },
        { .compatible = "renesas,rcar-gen3-msiof", .data = &rcar_gen3_data },
        { .compatible = "renesas,rcar-gen4-msiof", .data = &rcar_gen3_data },
@@ -1279,6 +1293,9 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
                return -ENXIO;
        }
 
+       if (chipdata->flags & SH_MSIOF_FLAG_FIXED_DTDL_200)
+               info->dtdl = 200;
+
        if (info->mode == MSIOF_SPI_TARGET)
                ctlr = spi_alloc_target(&pdev->dev,
                                        sizeof(struct sh_msiof_spi_priv));