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

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Date:   Thu, 28 May 2020 22:17:58 +0530
From:   Jishnu Prakash <jprakash@...eaurora.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, linus.walleij@...aro.org,
        Jonathan.Cameron@...wei.com, andy.shevchenko@...il.com,
        amit.kucheria@...durent.com, smohanad@...eaurora.org,
        kgunda@...eaurora.org, aghayal@...eaurora.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@...r.kernel.org,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V5 3/5] iio: adc: Add support for PMIC7 ADC

Hi Jonathan,

On 5/24/2020 5:29 PM, Jonathan Cameron wrote:
> On Fri, 22 May 2020 19:54:10 +0530
> 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.
>>
>> Signed-off-by: Jishnu Prakash <jprakash@...eaurora.org>
>> ---
>>   drivers/iio/adc/qcom-spmi-adc5.c   | 231 ++++++++++++++++++++++++++++++--
>>   drivers/iio/adc/qcom-vadc-common.c | 260 +++++++++++++++++++++++++++++++++++++
>>   drivers/iio/adc/qcom-vadc-common.h |  14 ++
>>   3 files changed, 496 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/iio/adc/qcom-spmi-adc5.c b/drivers/iio/adc/qcom-spmi-adc5.c
>> index 21fdcde..e1482fd 100644
>> --- a/drivers/iio/adc/qcom-spmi-adc5.c
>> +++ b/drivers/iio/adc/qcom-spmi-adc5.c
>> @@ -1,6 +1,6 @@
>>   // SPDX-License-Identifier: GPL-2.0
>>   /*
>> - * Copyright (c) 2018, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2018, 2020, The Linux Foundation. All rights reserved.
> ...
>> @@ -110,6 +120,7 @@ struct adc5_channel_prop {
>>   	enum adc5_cal_method	cal_method;
>>   	enum adc5_cal_val	cal_val;
>>   	unsigned int		decimation;
>> +	unsigned int		sid;
>>   	unsigned int		prescale;
>>   	unsigned int		hw_settle_time;
>>   	unsigned int		avg_samples;
>> @@ -140,6 +151,7 @@ struct adc5_chip {
>>   	bool			poll_eoc;
>>   	struct completion	complete;
>>   	struct mutex		lock;
>> +	int			irq_eoc;
> This is introduced but doesn't seem to be used...
I'll remove it in the next post.
>
>>   	const struct adc5_data	*data;
>>   };
>>   
>> @@ -155,6 +167,8 @@ static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
>>   	{.num =  1, .den = 16}
>>   };
>>   
> ...
>
>>   static int adc5_prescaling_from_dt(u32 num, u32 den)
>>   {
>>   	unsigned int pre;
>> @@ -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;
> As Andy mentioned, this is better in a separate patch. It's just adding
> noise to this patch which is actually doing things...
I'll split it out into a separate patch in the next post.
>
>>   
>>   	/* Digital param selection */
>> @@ -314,6 +333,47 @@ static int adc5_configure(struct adc5_chip *adc,
>>   	return adc5_write(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
>>   }
>>   
> Thanks,
>
> Jonathan