From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Jishnu Prakash <jprakash@codeaurora.org>
Cc: agross@kernel.org, Bjorn Andersson <bjorn.andersson@linaro.org>,
devicetree <devicetree@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Matthias Kaehlcke <mka@chromium.org>,
Linus Walleij <linus.walleij@linaro.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Amit Kucheria <amit.kucheria@verdurent.com>,
smohanad@codeaurora.org, kgunda@codeaurora.org,
aghayal@codeaurora.org, Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
linux-arm-msm@vger.kernel.org,
linux-iio <linux-iio@vger.kernel.org>,
linux-arm-msm-owner@vger.kernel.org
Subject: Re: [PATCH V4 3/5] iio: adc: Add support for PMIC7 ADC
Date: Wed, 13 May 2020 12:48:07 +0300 [thread overview]
Message-ID: <CAHp75VedM+=+m8WF=zPpUcizgCGareYuBzUfjKwesozVSY_gKg@mail.gmail.com> (raw)
In-Reply-To: <1589361736-816-4-git-send-email-jprakash@codeaurora.org>
On Wed, May 13, 2020 at 12:23 PM Jishnu Prakash <jprakash@codeaurora.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.
> +#define ADC7_CONV_TIMEOUT msecs_to_jiffies(10)
...
> + ret = adc5_read(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
> + if (ret < 0)
Is ' < 0' part necessary?
Ditto for same cases in other places in the code.
> + return ret;
...
> + switch (mask) {
> + case IIO_CHAN_INFO_PROCESSED:
> + ret = adc7_do_conversion(adc, prop, chan,
> + &adc_code_volt, &adc_code_cur);
> + if (ret)
> + return ret;
> +
> + ret = qcom_adc5_hw_scale(prop->scale_fn_type,
> + &adc5_prescale_ratios[prop->prescale],
> + adc->data,
> + adc_code_volt, val);
> +
> + if (ret)
> + return ret;
> +
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
Dead code?
...
> +static int qcom_vadc7_scale_hw_calib_die_temp(
> + const struct vadc_prescale_ratio *prescale,
> + const struct adc5_data *data,
> + u16 adc_code, int *result_mdec)
> +{
> +
> + int voltage, vtemp0, temp, i = ARRAY_SIZE(adcmap7_die_temp) - 1;
How assignment to i is useful?
> + voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
> + prescale, data, 1);
> +
> + if (adcmap7_die_temp[0].x > voltage) {
> + *result_mdec = DIE_TEMP_ADC7_SCALE_1;
> + return 0;
> + } else if (adcmap7_die_temp[i].x <= voltage) {
Redundant 'else'.
> + *result_mdec = DIE_TEMP_ADC7_MAX;
> + return 0;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(adcmap7_die_temp); i++)
> + if (adcmap7_die_temp[i].x > voltage)
> + break;
> +
> + vtemp0 = adcmap7_die_temp[i - 1].x;
> + voltage = voltage - vtemp0;
> + temp = div64_s64(voltage * DIE_TEMP_ADC7_SCALE_FACTOR,
> + adcmap7_die_temp[i - 1].y);
> + temp += DIE_TEMP_ADC7_SCALE_1 + (DIE_TEMP_ADC7_SCALE_2 * (i - 1));
> + *result_mdec = temp;
> +
> + return 0;
> +}
...
> +#define RATIO_MAX_ADC7 0x4000
Hmm... Why the last is in hex? Is it related to amount of bits in the
hardware? Then probably better to use BIT().
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-05-13 10:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 9:22 [PATCH V4 0/5] iio: adc: Add support for QCOM SPMI PMIC7 ADC Jishnu Prakash
2020-05-13 9:22 ` [PATCH V4 1/5] iio: adc: Convert the QCOM SPMI ADC bindings to .yaml format Jishnu Prakash
2020-05-18 7:25 ` Linus Walleij
2020-05-13 9:22 ` [PATCH V4 2/5] iio: adc: Add PMIC7 ADC bindings Jishnu Prakash
2020-05-13 9:22 ` [PATCH V4 3/5] iio: adc: Add support for PMIC7 ADC Jishnu Prakash
2020-05-13 9:48 ` Andy Shevchenko [this message]
2020-05-22 11:58 ` Jishnu Prakash
2020-05-22 15:31 ` Andy Shevchenko
2020-05-13 9:22 ` [PATCH V4 4/5] iio: adc: Update error checks and debug prints Jishnu Prakash
2020-05-13 9:49 ` Andy Shevchenko
2020-05-22 11:58 ` Jishnu Prakash
2020-05-13 9:22 ` [PATCH V4 5/5] iio: adc: Clean up ADC code common to PMIC5 and PMIC7 Jishnu Prakash
2020-05-13 9:51 ` Andy Shevchenko
2020-05-22 11:59 ` Jishnu Prakash
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAHp75VedM+=+m8WF=zPpUcizgCGareYuBzUfjKwesozVSY_gKg@mail.gmail.com' \
--to=andy.shevchenko@gmail.com \
--cc=Jonathan.Cameron@huawei.com \
--cc=aghayal@codeaurora.org \
--cc=agross@kernel.org \
--cc=amit.kucheria@verdurent.com \
--cc=bjorn.andersson@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=jic23@kernel.org \
--cc=jprakash@codeaurora.org \
--cc=kgunda@codeaurora.org \
--cc=knaack.h@gmx.de \
--cc=lars@metafoo.de \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-msm-owner@vger.kernel.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mka@chromium.org \
--cc=pmeerw@pmeerw.net \
--cc=smohanad@codeaurora.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).