linux-kernel - [PATCH 2/3] i2c: rcar: introduce Gen4 devices

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Message-Id: <20230904135852.12146-3-wsa+renesas@sang-engineering.com>
Date:   Mon,  4 Sep 2023 15:58:50 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-renesas-soc@...r.kernel.org
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] i2c: rcar: introduce Gen4 devices

So far, we treated Gen4 as Gen3. But we are soon adding FM+ as a Gen4
specific feature, so prepare the code for the new devtype.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/i2c/busses/i2c-rcar.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index f2b953df0c4d..76aa16bf17b2 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -114,6 +114,7 @@ enum rcar_i2c_type {
 	I2C_RCAR_GEN1,
 	I2C_RCAR_GEN2,
 	I2C_RCAR_GEN3,
+	I2C_RCAR_GEN4,
 };
 
 struct rcar_i2c_priv {
@@ -218,7 +219,7 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
 	/* start clock */
 	rcar_i2c_write(priv, ICCCR, priv->icccr);
 
-	if (priv->devtype == I2C_RCAR_GEN3)
+	if (priv->devtype >= I2C_RCAR_GEN3)
 		rcar_i2c_write(priv, ICFBSCR, TCYC17);
 
 }
@@ -251,22 +252,11 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv)
 		.scl_int_delay_ns	= 50,
 	};
 
+	cdf_width = (priv->devtype == I2C_RCAR_GEN1) ? 2 : 3;
+
 	/* Fall back to previously used values if not supplied */
 	i2c_parse_fw_timings(dev, &t, false);
 
-	switch (priv->devtype) {
-	case I2C_RCAR_GEN1:
-		cdf_width = 2;
-		break;
-	case I2C_RCAR_GEN2:
-	case I2C_RCAR_GEN3:
-		cdf_width = 3;
-		break;
-	default:
-		dev_err(dev, "device type error\n");
-		return -EIO;
-	}
-
 	/*
 	 * calculate SCL clock
 	 * see
@@ -1031,10 +1021,12 @@ static const struct of_device_id rcar_i2c_dt_ids[] = {
 	{ .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 },
 	{ .compatible = "renesas,i2c-r8a7795", .data = (void *)I2C_RCAR_GEN3 },
 	{ .compatible = "renesas,i2c-r8a7796", .data = (void *)I2C_RCAR_GEN3 },
+	/* S4 has no FM+ bit */
+	{ .compatible = "renesas,i2c-r8a779f0", .data = (void *)I2C_RCAR_GEN3 },
 	{ .compatible = "renesas,rcar-gen1-i2c", .data = (void *)I2C_RCAR_GEN1 },
 	{ .compatible = "renesas,rcar-gen2-i2c", .data = (void *)I2C_RCAR_GEN2 },
 	{ .compatible = "renesas,rcar-gen3-i2c", .data = (void *)I2C_RCAR_GEN3 },
-	{ .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN3 },
+	{ .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN4 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids);
@@ -1101,6 +1093,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 		irqhandler = rcar_i2c_gen2_irq;
 	}
 
+	/* Gen3 needs reset for RXDMA */
 	if (priv->devtype == I2C_RCAR_GEN3) {
 		priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 		if (!IS_ERR(priv->rstc)) {
-- 
2.35.1