patch "iio: accel: bma400: Ensure VDDIO is enable defore reading the chip" added to char-misc-linus

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

iio: accel: bma400: Ensure VDDIO is enable defore reading the chip

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 57572cacd36e6d4be7722d7770d23f4430219827 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <[email protected]>
Date: Sun, 2 Oct 2022 15:41:33 +0100
Subject: iio: accel: bma400: Ensure VDDIO is enable defore reading the chip
ID.

The regulator enables were after the check on the chip variant, which was very unlikely to return a correct value when not powered. Presumably all the device anyone is testing on have a regulator that is already powered up when this code runs for reasons beyond the scope of this driver. Move the read call down a few lines.

---
 drivers/iio/accel/bma400_core.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

index ad8fce3e08cd..490c342ef72a 100644
@@ -869,18 +869,6 @@ static int bma400_init(struct bma400_data *data)
 	unsigned int val;
 	int ret;
 
-	/* Try to read chip_id register. It must return 0x90. */
-	ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val);
-	if (ret) {
-		dev_err(data->dev, "Failed to read chip id register\n");
-		return ret;
-	}
-
-	if (val != BMA400_ID_REG_VAL) {
-		dev_err(data->dev, "Chip ID mismatch\n");
-		return -ENODEV;
-	}
-
 	data->regulators[BMA400_VDD_REGULATOR].supply = "vdd";
 	data->regulators[BMA400_VDDIO_REGULATOR].supply = "vddio";
 	ret = devm_regulator_bulk_get(data->dev,

@@ -906,6 +894,18 @@ static int bma400_init(struct bma400_data *data)
 	if (ret)
 		return ret;
 
+	/* Try to read chip_id register. It must return 0x90. */
+	ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val);
+	if (ret) {
+		dev_err(data->dev, "Failed to read chip id register\n");
+		return ret;
+	}
+
+	if (val != BMA400_ID_REG_VAL) {
+		dev_err(data->dev, "Chip ID mismatch\n");
+		return -ENODEV;
+	}
+
 	ret = bma400_get_power_mode(data);
 	if (ret) {
 		dev_err(data->dev, "Failed to get the initial power-mode\n");

2.38.1