iio: adc: vf610_adc: limit i.MX6SX's channel number to 4

i.MX6SX only has 4 ADC channels, so limit channel numbers to 4 for
compatible string 'fsl,imx6sx-adc'.

Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20241126195256.2441622-2-Frank.Li@nxp.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index fb7afa91151f2e3a40e48997d1eba9d2a893015f..61bba39f7e93d4296866f0ae4aa79acdb01b024a 100644 (file)
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -177,6 +177,10 @@ struct vf610_adc {
        } scan;
 };
 
+struct vf610_chip_info {
+       u8 num_channels;
+};
+
 static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
 static const u32 vf610_lst_adder[] = { 3, 5, 7, 9, 13, 17, 21, 25 };
 
@@ -808,8 +812,17 @@ static const struct iio_info vf610_adc_iio_info = {
        .attrs = &vf610_attribute_group,
 };
 
+static const struct vf610_chip_info vf610_chip_info = {
+       .num_channels = ARRAY_SIZE(vf610_adc_iio_channels),
+};
+
+static const struct vf610_chip_info imx6sx_chip_info = {
+       .num_channels = 4,
+};
+
 static const struct of_device_id vf610_adc_match[] = {
-       { .compatible = "fsl,vf610-adc", },
+       { .compatible = "fsl,imx6sx-adc", .data = &imx6sx_chip_info},
+       { .compatible = "fsl,vf610-adc", .data = &vf610_chip_info},
        { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, vf610_adc_match);
@@ -823,6 +836,7 @@ static void vf610_adc_action_remove(void *d)
 
 static int vf610_adc_probe(struct platform_device *pdev)
 {
+       const struct vf610_chip_info *chip_info;
        struct device *dev = &pdev->dev;
        struct vf610_adc *info;
        struct iio_dev *indio_dev;
@@ -840,6 +854,8 @@ static int vf610_adc_probe(struct platform_device *pdev)
        if (IS_ERR(info->regs))
                return PTR_ERR(info->regs);
 
+       chip_info = device_get_match_data(dev);
+
        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;
@@ -881,7 +897,7 @@ static int vf610_adc_probe(struct platform_device *pdev)
        indio_dev->info = &vf610_adc_iio_info;
        indio_dev->modes = INDIO_DIRECT_MODE;
        indio_dev->channels = vf610_adc_iio_channels;
-       indio_dev->num_channels = ARRAY_SIZE(vf610_adc_iio_channels);
+       indio_dev->num_channels = chip_info->num_channels;
 
        vf610_adc_cfg_init(info);
        vf610_adc_hw_init(info);