[PATCH 3/5] mmc: mtk-sd: add support for config found in mt7620 family SOCs.

[NeilBrown]

mt7620 family MIPS SOCs contain the mtk-sd silicon.
Add support for this.

Signed-off-by: NeilBrown <n...@brown.name>

# Conflicts:
#       drivers/mmc/host/mtk-sd.c
---
 Documentation/devicetree/bindings/mmc/mtk-sd.txt |    1 +
 drivers/mmc/host/mtk-sd.c                        |   12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt 
b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
index ed61cd5a5b8f..b6daa9773b25 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
@@ -15,6 +15,7 @@ Required properties:
        "mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
        "mediatek,mt7622-mmc": for MT7622 SoC
        "mediatek,mt7623-mmc", "mediatek,mt2701-mmc": for MT7623 SoC
+       "ralink,mt7620-sdhci", for MT7621 SoC (and others)
 
 - reg: physical base address of the controller and length
 - interrupts: Should contain MSDC interrupt number
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 14e048239143..d379f2ece305 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -517,6 +517,17 @@ static const struct mtk_mmc_compatible mt8516_compat = {
        .stop_clk_fix = true,
 };
 
+static const struct mtk_mmc_compatible mt7620_compat = {
+       .clk_div_bits = 8,
+       .hs400_tune = false,
+       .pad_tune_reg = MSDC_PAD_TUNE,
+       .async_fifo = false,
+       .data_tune = false,
+       .busy_check = false,
+       .stop_clk_fix = false,
+       .enhance_rx = false,
+};
+
 static const struct of_device_id msdc_of_ids[] = {
        { .compatible = "mediatek,mt8135-mmc", .data = &mt8135_compat},
        { .compatible = "mediatek,mt8173-mmc", .data = &mt8173_compat},
@@ -525,6 +536,7 @@ static const struct of_device_id msdc_of_ids[] = {
        { .compatible = "mediatek,mt2712-mmc", .data = &mt2712_compat},
        { .compatible = "mediatek,mt7622-mmc", .data = &mt7622_compat},
        { .compatible = "mediatek,mt8516-mmc", .data = &mt8516_compat},
+       { .compatible = "ralink,mt7620-sdhci", .data = &mt7620_compat},
        {}
 };
 MODULE_DEVICE_TABLE(of, msdc_of_ids);