Patch "i2c: rcar: introduce Gen4 devices" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    i2c: rcar: introduce Gen4 devices

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-rcar-introduce-gen4-devices.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 86756256af0a280099ff4dd4413bc9e58bffe7ff
Author: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Date:   Thu Dec 14 08:43:57 2023 +0100

    i2c: rcar: introduce Gen4 devices
    
    [ Upstream commit 2b523c46e81ebd621515ab47117f95de197dfcbf ]
    
    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@xxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
    Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
    Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
    Stable-dep-of: ea5ea84c9d35 ("i2c: rcar: ensure Gen3+ reset does not disturb local targets")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 3fda82159e54d..2719bc5a1a771 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 {
@@ -394,8 +395,8 @@ static void rcar_i2c_cleanup_dma(struct rcar_i2c_priv *priv, bool terminate)
 	dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg),
 			 sg_dma_len(&priv->sg), priv->dma_direction);
 
-	/* Gen3 can only do one RXDMA per transfer and we just completed it */
-	if (priv->devtype == I2C_RCAR_GEN3 &&
+	/* Gen3+ can only do one RXDMA per transfer and we just completed it */
+	if (priv->devtype >= I2C_RCAR_GEN3 &&
 	    priv->dma_direction == DMA_FROM_DEVICE)
 		priv->flags |= ID_P_NO_RXDMA;
 
@@ -849,8 +850,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
 	if (ret < 0)
 		goto out;
 
-	/* Gen3 needs a reset before allowing RXDMA once */
-	if (priv->devtype == I2C_RCAR_GEN3) {
+	/* Gen3+ needs a reset. That also allows RXDMA once */
+	if (priv->devtype >= I2C_RCAR_GEN3) {
 		priv->flags &= ~ID_P_NO_RXDMA;
 		ret = rcar_i2c_do_reset(priv);
 		if (ret)
@@ -1035,7 +1036,7 @@ static const struct of_device_id rcar_i2c_dt_ids[] = {
 	{ .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);
@@ -1113,7 +1114,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 	if (of_property_read_bool(dev->of_node, "smbus"))
 		priv->flags |= ID_P_HOST_NOTIFY;
 
-	if (priv->devtype == I2C_RCAR_GEN3) {
+	if (priv->devtype >= I2C_RCAR_GEN3) {
 		priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 		if (IS_ERR(priv->rstc))
 			goto out_pm_put;