Hello Sascha,
On 24.10.22 10:12, Sascha Hauer wrote:
>> +/* ADC register */
>> +#define IMX7D_REG_ADC_CH_A_CFG1 0x00
>> +#define IMX7D_REG_ADC_CH_A_CFG2 0x10
>> +#define IMX7D_REG_ADC_CH_B_CFG1 0x20
>> +#define IMX7D_REG_ADC_CH_B_CFG2 0x30
>> +#define IMX7D_REG_ADC_CH_C_CFG1 0x40
>> +#define IMX7D_REG_ADC_CH_C_CFG2 0x50
>> +#define IMX7D_REG_ADC_CH_D_CFG1 0x60
>> +#define IMX7D_REG_ADC_CH_D_CFG2 0x70
>
> These defines are unused.
I know. I just copied them from the kernel driver. Will drop
for v2.
>> +#define IMX7D_REG_ADC_CH_SW_CFG 0x80
>> +#define IMX7D_REG_ADC_TIMER_UNIT 0x90
>> +#define IMX7D_REG_ADC_DMA_FIFO 0xa0
>> +#define IMX7D_REG_ADC_FIFO_STATUS 0xb0
>> +#define IMX7D_REG_ADC_INT_SIG_EN 0xc0
>> +#define IMX7D_REG_ADC_INT_EN 0xd0
>> +#define IMX7D_REG_ADC_INT_STATUS 0xe0
>> +#define IMX7D_REG_ADC_CHA_B_CNV_RSLT 0xf0
>> +#define IMX7D_REG_ADC_CHC_D_CNV_RSLT 0x100
>> +#define IMX7D_REG_ADC_CH_SW_CNV_RSLT 0x110
>> +#define IMX7D_REG_ADC_DMA_FIFO_DAT 0x120
>> +#define IMX7D_REG_ADC_ADC_CFG 0x130
>> +
>> +#define IMX7D_REG_ADC_CHANNEL_CFG2_BASE 0x10
>> +#define IMX7D_EACH_CHANNEL_REG_OFFSET 0x20
>
> Better something like:
>
> #define IMX7D_REG_ADC_CFG1(ch) ((ch) * 0x20)
> #define IMX7D_REG_ADC_CFG2(ch) ((ch) * 0x20 + 0x10)
Done.
>> + struct imx7d_adc_analogue_core_clk adc_analogure_clk;
>
> s/adc_analogure_clk/adc_analogue_clk/
>
>> + u32 i;
>
> unsigned int?
Done.
>> + status = readl(info->regs + IMX7D_REG_ADC_INT_STATUS);
>> + if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS) {
>> + ret = imx7d_adc_read_data(info, channel);
>
> Returning the adc data from a function named _isr in conjunction with
> using a variable named 'ret' for both error codes and adc data makes the
> code unnecessarily hard to follow. Could you refactor a bit to make this
> more readable?
I will rename imx7d_adc_read_data to __imx7d_adc_read_data and
imx7d_adc_isr to imx7d_adc_read_data.
>> +static int imx7d_adc_read_raw(struct aiochannel *chan, int *data)
>> +{
>> + struct imx7d_adc *info = container_of(chan->aiodev, struct imx7d_adc,
>> aiodev);
>> + u64 raw64, start;
>> + u32 channel;
>> + int ret;
>> +
>> + channel = chan->index & 0x03;
>
> You are registering 16 channels, but here you limit to a maximum of four
> channels.
I am looking at the Linux driver and I don't see how channels
4-15 could possibly do something 0-3 don't already do.
The hardware has 16 input channels, which can be routed to one
of the 4 logical channels, but the driver always muxes only
the first 4 input channels. I'll reduce the number of channels to 4.
>
>> + imx7d_adc_channel_set(info, channel);
>> +
>> + start = get_time_ns();
>> + do {
>> + if (is_timeout(start, IMX7D_ADC_TIMEOUT_NSEC)) {
>> + ret = -ETIMEDOUT;
>> + break;
>> + }
>> +
>> + ret = imx7d_adc_isr(info, channel);
>> + } while (ret == -EAGAIN);
>> +
>> + if (ret < 0)
>> + return ret;
>> +
>> + raw64 = ret;
>> + raw64 *= info->vref_uv;
>> + raw64 = div_u64(raw64, 1000);
>> + *data = div_u64(raw64, (1 << 12));
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id imx7d_adc_match[] = {
>> + { .compatible = "fsl,imx7d-adc", },
>> + { /* sentinel */ }
>> +};
>> +
>> +static void imx7d_adc_power_down(struct imx7d_adc *info)
>> +{
>> + u32 adc_cfg;
>> +
>> + adc_cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);
>> + adc_cfg |= IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN |
>> + IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN;
>> + adc_cfg &= ~IMX7D_REG_ADC_ADC_CFG_ADC_EN;
>> + writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);
>> +}
>> +
>> +static int imx7d_adc_enable(struct imx7d_adc *info)
>> +{
>> + struct device_d *dev = info->dev;
>> + int ret;
>> +
>> + ret = regulator_enable(info->vref);
>> + if (ret)
>> + return dev_err_probe(dev, ret,
>> + "Can't enable adc reference top
>> voltage\n");
>> +
>> + ret = clk_enable(info->clk);
>> + if (ret) {
>> + regulator_disable(info->vref);
>> + return dev_err_probe(dev, ret, "Could not enable clock.\n");
>> + }
>> +
>> + imx7d_adc_hw_init(info);
>> +
>> + ret = regulator_get_voltage(info->vref);
>> + if (ret < 0)
>> + return dev_err_probe(dev, ret, "can't get vref-supply value\n");
>> +
>> + info->vref_uv = ret;
>> + return 0;
>> +}
>> +
>> +static u32 imx7d_adc_get_sample_rate(struct imx7d_adc *info)
>> +{
>> + u32 analogue_core_clk;
>> + u32 core_time_unit = info->adc_feature.core_time_unit;
>> + u32 tmp;
>> +
>> + analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;
>> + tmp = (core_time_unit + 1) * 6;
>> +
>> + return analogue_core_clk / tmp;
>> +}
>> +
>> +static void imx7d_adc_devinfo(struct device_d *dev)
>> +{
>> + struct imx7d_adc *info = dev->priv;
>> +
>> + if (info->aiodev_info)
>> + info->aiodev_info(dev);
>> +
>> + printf("Sample Rate: %u\n", imx7d_adc_get_sample_rate(info));
>> +}
>> +
>> +static int imx7d_adc_probe(struct device_d *dev)
>> +{
>> + struct aiodevice *aiodev;
>> + struct imx7d_adc *info;
>> + int ret, i;
>> +
>> + info = xzalloc(sizeof(*info));
>> +
>> + info->dev = dev;
>> +
>> + info->clk = clk_get(dev, "adc");
>> + if (IS_ERR(info->clk))
>> + return dev_err_probe(dev, PTR_ERR(info->clk), "Failed getting
>> clock\n");
>> +
>> + info->vref = regulator_get(dev, "vref");
>> + if (IS_ERR(info->vref))
>> + return dev_err_probe(dev, PTR_ERR(info->vref),
>> + "Failed getting reference voltage\n");
>> +
>> + info->regs = dev_request_mem_region(dev, 0);
>> + if (IS_ERR(info->regs))
>> + return dev_err_probe(dev, PTR_ERR(info->regs),
>> + "Failed to get memory region\n");
>> +
>> + dev->priv = aiodev = &info->aiodev;
>> +
>> + aiodev->num_channels = 16;
>> + aiodev->hwdev = dev;
>> + aiodev->read = imx7d_adc_read_raw;
>> + aiodev->channels = xmalloc(aiodev->num_channels *
>> sizeof(aiodev->channels[0]));;
>
> Use xzalloc to make sure all fields are initialized.
>
> One semicolon too much at the end of this line.
Ok.
>
>> +
>> + for (i = 0; i < aiodev->num_channels; i++) {
>> + aiodev->channels[i] = &info->aiochan[i];
>> + info->aiochan[i].unit = "mV";
>> + }
>> +
>> + imx7d_adc_feature_config(info);
>> +
>> + ret = imx7d_adc_enable(info);
>> + if (ret)
>> + return ret;
>> +
>> + ret = aiodevice_register(aiodev);
>> + if (ret < 0)
>> + return dev_err_probe(dev, ret, "Failed to register aiodev\n");
>> +
>> + info->aiodev_info = aiodev->dev.info;
>> + aiodev->dev.info = imx7d_adc_devinfo;
>> +
>> + return 0;
>> +}
>> +
>> +static void imx7d_adc_disable(struct device_d *dev)
>> +{
>> + struct imx7d_adc *info = dev->priv;
>
> dev->priv is set to &info->aiodev above.
Yes. I changed that in the fixup. Will squash.
>
> Sascha
>
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