[PATCH 6/8] spi: mtk_snor: support newer SOCs

[David Lechner]

From: "Noah.Shen" <noah.shen at mediatek.com>

Add support for some newer SOCs. New compatible strings are added to the
lookup table. Some SOCs also need a extra bit clocked out as a hardware
quirk, so a new capability structure and code is added to support that.

Signed-off-by: Noah.Shen <noah.shen at mediatek.com>
Signed-off-by: David Lechner <dlechner at baylibre.com>
---
 drivers/spi/mtk_snor.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/mtk_snor.c b/drivers/spi/mtk_snor.c
index 77f94827568..649bca5716c 100644
--- a/drivers/spi/mtk_snor.c
+++ b/drivers/spi/mtk_snor.c
@@ -104,9 +104,19 @@
 
 #define MTK_NOR_UNLOCK_ALL 0x0
 
+struct mtk_snor_caps {
+	/*
+	 * Some new SoCs modify the timing of fetching registers' values and IDs
+	 * of NOR flash, they need a extra_bit which can add more clock cycles
+	 * for fetching data.
+	 */
+	u8 extra_bit;
+};
+
 struct mtk_snor_priv {
 	struct device *dev;
 	void __iomem *base;
+	const struct mtk_snor_caps *caps;
 	u8 *buffer;
 	struct clk spi_clk;
 	struct clk ctlr_clk;
@@ -448,7 +458,11 @@ static int mtk_snor_cmd_program(struct mtk_snor_priv *priv,
 	}
 
 	/* trigger op */
-	writel(prg_len * BITS_PER_BYTE, priv->base + MTK_NOR_REG_PRG_CNT);
+	if (rx_len)
+		writel(prg_len * BITS_PER_BYTE + priv->caps->extra_bit,
+		       priv->base + MTK_NOR_REG_PRG_CNT);
+	else
+		writel(prg_len * BITS_PER_BYTE, priv->base + MTK_NOR_REG_PRG_CNT);
 
 	ret = mtk_snor_cmd_exec(priv, MTK_NOR_CMD_PROGRAM, prg_len * BITS_PER_BYTE);
 	if (ret)
@@ -508,6 +522,8 @@ static int mtk_snor_probe(struct udevice *bus)
 	if (!priv->base)
 		return -EINVAL;
 
+	priv->caps = (const void *)dev_get_driver_data(bus);
+
 	ret = clk_get_by_name(bus, "spi", &priv->spi_clk);
 	if (ret < 0)
 		return ret;
@@ -584,8 +600,19 @@ static const struct dm_spi_ops mtk_snor_ops = {
 	.set_mode = mtk_snor_set_mode,
 };
 
+static const struct mtk_snor_caps mtk_snor_caps_default = {
+	.extra_bit = 0,
+};
+
+static const struct mtk_snor_caps mtk_snor_caps_extra_bit = {
+	.extra_bit = 1,
+};
+
 static const struct udevice_id mtk_snor_ids[] = {
-	{ .compatible = "mediatek,mtk-snor" },
+	{ .compatible = "mediatek,mtk-snor", .data = (ulong)&mtk_snor_caps_default },
+	{ .compatible = "mediatek,mt8188-nor", .data = (ulong)&mtk_snor_caps_extra_bit },
+	{ .compatible = "mediatek,mt8189-nor", .data = (ulong)&mtk_snor_caps_extra_bit },
+	{ .compatible = "mediatek,mt8195-nor", .data = (ulong)&mtk_snor_caps_default },
 	{}
 };
 

-- 
2.43.0