linux-kernel - [PATCH] spi: rockchip-sfc: Support sclk

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Message-Id: <20241219142216.2123065-1-jon.lin@rock-chips.com>
Date: Thu, 19 Dec 2024 22:22:16 +0800
From: Jon Lin <jon.lin@...k-chips.com>
To: broonie@...nel.org
Cc: linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	heiko@...ech.de,
	jon.lin@...k-chips.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org
Subject: [PATCH] spi: rockchip-sfc: Support sclk_x2 version

SFC after version 8 supports dtr mode, so the IO is the binary output of
the controller clock.

Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
---

 drivers/spi/spi-rockchip-sfc.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
index 36509bcccc27..59de351499a0 100644
--- a/drivers/spi/spi-rockchip-sfc.c
+++ b/drivers/spi/spi-rockchip-sfc.c
@@ -112,6 +112,7 @@
 #define  SFC_VER_3			0x3
 #define  SFC_VER_4			0x4
 #define  SFC_VER_5			0x5
+#define  SFC_VER_8			0x8
 
 /* Delay line controller register */
 #define SFC_DLL_CTRL0			0x3C
@@ -217,6 +218,22 @@ static u32 rockchip_sfc_get_max_iosize(struct rockchip_sfc *sfc)
 	return SFC_MAX_IOSIZE_VER3;
 }
 
+static int rockchip_sfc_clk_set_rate(struct rockchip_sfc *sfc, unsigned long  speed)
+{
+	if (sfc->version >= SFC_VER_8)
+		return clk_set_rate(sfc->clk, speed * 2);
+	else
+		return clk_set_rate(sfc->clk, speed);
+}
+
+static unsigned long rockchip_sfc_clk_get_rate(struct rockchip_sfc *sfc)
+{
+	if (sfc->version >= SFC_VER_8)
+		return clk_get_rate(sfc->clk) / 2;
+	else
+		return clk_get_rate(sfc->clk);
+}
+
 static void rockchip_sfc_irq_unmask(struct rockchip_sfc *sfc, u32 mask)
 {
 	u32 reg;
@@ -519,12 +536,12 @@ static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op
 
 	if (unlikely(mem->spi->max_speed_hz != sfc->speed[cs]) &&
 	    !has_acpi_companion(sfc->dev)) {
-		ret = clk_set_rate(sfc->clk, mem->spi->max_speed_hz);
+		ret = rockchip_sfc_clk_set_rate(sfc, mem->spi->max_speed_hz);
 		if (ret)
 			goto out;
 		sfc->speed[cs] = mem->spi->max_speed_hz;
 		dev_dbg(sfc->dev, "set_freq=%dHz real_freq=%ldHz\n",
-			sfc->speed[cs], clk_get_rate(sfc->clk));
+			sfc->speed[cs], rockchip_sfc_clk_get_rate(sfc));
 	}
 
 	rockchip_sfc_adjust_op_work((struct spi_mem_op *)op);
-- 
2.34.1