linux-kernel - Re: [PATCH V5 3/5] iio: adc: Add support for PMIC7 ADC

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Message-ID: <81ef429e-48d5-48b3-b344-3a48c2287907@codeaurora.org>
Date:   Thu, 28 May 2020 22:17:08 +0530
From:   Jishnu Prakash <jprakash@...eaurora.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     agross@...nel.org, Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        smohanad@...eaurora.org, kgunda@...eaurora.org,
        aghayal@...eaurora.org, Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-arm-msm@...r.kernel.org,
        linux-iio <linux-iio@...r.kernel.org>,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V5 3/5] iio: adc: Add support for PMIC7 ADC

Hi Andy,

On 5/22/2020 9:07 PM, Andy Shevchenko wrote:
> On Fri, May 22, 2020 at 5:25 PM Jishnu Prakash <jprakash@...eaurora.org> wrote:
>> The ADC architecture on PMIC7 is changed as compared to PMIC5. The
>> major change from PMIC5 is that all SW communication to ADC goes through
>> PMK8350, which communicates with other PMICs through PBS when the ADC
>> on PMK8350 works in master mode. The SID register is used to identify the
>> PMICs with which the PBS needs to communicate. Add support for the same.
> Below should be in a separate patch, but it's a bikeshedding. So, I
> left it to maintainers to decide.
> Fine with me
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
>
> ...
>
>> @@ -285,7 +304,7 @@ static int adc5_configure(struct adc5_chip *adc,
>>
>>          /* Read registers 0x42 through 0x46 */
>>          ret = adc5_read(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
>> -       if (ret < 0)
>> +       if (ret)
>>                  return ret;
>>
>>          /* Digital param selection */
> ...
>
>> @@ -331,7 +391,7 @@ static int adc5_do_conversion(struct adc5_chip *adc,
>>
>>          if (adc->poll_eoc) {
>>                  ret = adc5_poll_wait_eoc(adc);
>> -               if (ret < 0) {
>> +               if (ret) {
>>                          pr_err("EOC bit not set\n");
>>                          goto unlock;
>>                  }
>> @@ -341,7 +401,7 @@ static int adc5_do_conversion(struct adc5_chip *adc,
>>                  if (!ret) {
>>                          pr_debug("Did not get completion timeout.\n");
>>                          ret = adc5_poll_wait_eoc(adc);
>> -                       if (ret < 0) {
>> +                       if (ret) {
>>                                  pr_err("EOC bit not set\n");
>>                                  goto unlock;
>>                          }
> ...
>
>> @@ -406,8 +519,38 @@ static int adc5_read_raw(struct iio_dev *indio_dev,
>>          default:
>>                  return -EINVAL;
>>          }
>> +}
>>
>> -       return 0;
> (this one looks like standalone change from above)
>
> ...
>
>> @@ -570,7 +762,7 @@ static int adc5_get_dt_channel_data(struct adc5_chip *adc,
>>
>>                  ret = adc5_read(adc, ADC5_USR_REVISION1, dig_version,
>>                                                          sizeof(dig_version));
>> -               if (ret < 0) {
>> +               if (ret) {
>>                          dev_err(dev, "Invalid dig version read %d\n", ret);
>>                          return ret;
>>                  }
> ...
>
>> +       if (of_device_is_compatible(node, "qcom,spmi-adc7"))
>> +               indio_dev->info = &adc7_info;
>> +       else
>> +               indio_dev->info = &adc5_info;
> Can we use driver_data?
I'll make the change in a patch before this one in the next post.
>
> ...
>
>> +       if (adcmap7_die_temp[0].x > voltage) {
>> +               *result_mdec = DIE_TEMP_ADC7_SCALE_1;
>> +               return 0;
>> +       } else if (adcmap7_die_temp[i].x <= voltage) {
> As per previous comment, redundant 'else' and please use value of i
> directly here.
I'll add the change in the next post.

>
>