linux-kernel - [PATCH 06/11] spi: spi-nxp-fspi: enable octal ddr for iMX8QM/QXP/DXL

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Date:   Tue,  5 Jul 2022 17:11:38 +0800
From:   haibo.chen@....com
To:     ashish.kumar@....com, yogeshgaur.83@...il.com, broonie@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        han.xu@....com, singh.kuldeep87k@...il.com,
        tudor.ambarus@...rochip.com, p.yadav@...com, michael@...le.cc,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        festevam@...il.com, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, haibo.chen@....com,
        zhengxunli@...c.com.tw
Subject: [PATCH 06/11] spi: spi-nxp-fspi: enable octal ddr for iMX8QM/QXP/DXL

From: Han Xu <han.xu@....com>

To enable the octal ddr for iMX8QM/QXP/DXL, need to set the proper
slave line delay to get the correct sample points. So add one entry
in dts to set it.

Signed-off-by: Han Xu <han.xu@....com>
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/spi/spi-nxp-fspi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 61cf1b82c0d7..cfc2600e3b6d 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -218,9 +218,13 @@
 
 #define FSPI_DLLACR			0xC0
 #define FSPI_DLLACR_OVRDEN		BIT(8)
+#define FSPI_DLLACR_SLVDLY(x)          ((x) << 3)
+#define FSPI_DLLACR_DLLEN              BIT(0)
 
 #define FSPI_DLLBCR			0xC4
 #define FSPI_DLLBCR_OVRDEN		BIT(8)
+#define FSPI_DLLBCR_SLVDLY(x)          ((x) << 3)
+#define FSPI_DLLBCR_DLLEN              BIT(0)
 
 #define FSPI_STS0			0xE0
 #define FSPI_STS0_DLPHB(x)		((x) << 8)
@@ -375,6 +379,7 @@ struct nxp_fspi {
 	u32 memmap_phy_size;
 	u32 memmap_start;
 	u32 memmap_len;
+	u32 dll_slvdly;
 	struct clk *clk, *clk_en;
 	struct device *dev;
 	struct completion c;
@@ -1081,6 +1086,13 @@ static int nxp_fspi_default_setup(struct nxp_fspi *f)
 	fspi_writel(f, FSPI_DLLACR_OVRDEN, base + FSPI_DLLACR);
 	fspi_writel(f, FSPI_DLLBCR_OVRDEN, base + FSPI_DLLBCR);
 
+	if (f->dll_slvdly) {
+		fspi_writel(f, FSPI_DLLACR_DLLEN | FSPI_DLLACR_SLVDLY(f->dll_slvdly),
+			    base + FSPI_DLLACR);
+		fspi_writel(f, FSPI_DLLBCR_DLLEN | FSPI_DLLBCR_SLVDLY(f->dll_slvdly),
+			    base + FSPI_DLLBCR);
+	}
+
 	/* enable module */
 	fspi_writel(f, FSPI_MCR0_AHB_TIMEOUT(0xFF) |
 		    FSPI_MCR0_IP_TIMEOUT(0xFF) | (u32) FSPI_MCR0_OCTCOMB_EN,
@@ -1259,6 +1271,9 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 		goto err_disable_clk;
 	}
 
+	/* check if need to set the slave delay line */
+	of_property_read_u32(np, "nxp,fspi-dll-slvdly", &f->dll_slvdly);
+
 	mutex_init(&f->lock);
 
 	ctlr->bus_num = -1;
-- 
2.25.1