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Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC

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On Tue, May 3, 2016 at 1:43 PM, Jonathan Cameron
<jic23@jic23.retrosnub.co.uk> wrote:
>
>
> On 3 May 2016 09:29:26 CEST, Daniel Baluta <daniel.baluta@intel.com> wrote:
>>On Sun, May 1, 2016 at 9:56 PM, Jonathan Cameron <jic23@kernel.org>
>>wrote:
>>> On 29/04/16 13:19, Constantin Musca wrote:
>>>> Minimal implementation of an IIO driver for the Freescale
>>>> MMA7660FC 3-axis accelerometer. Datasheet:
>>>>
>>http://www.freescale.com.cn/files/sensors/doc/data_sheet/MMA7660FC.pdf
>>>>
>>>> Includes:
>>>> - ACPI support;
>>>> - read_raw for x,y,z axes;
>>>> - reading and setting the scale (range) parameter.
>>>> - power management
>>>>
>>>> Signed-off-by: Constantin Musca <constantin.musca@intel.com>
>>> Couple of trivial bits inline as well as that request to update the
>>link above
>>> if possible...
>>>
>>> Why the retries? (I'm on a train without internet access for quite a
>>few
>>> hours yet hence I can't dig into the datasheet!)
>>
>>I suggested the retries because it's quite unsafe to infinitely loop
>>in the kernel
>>on a hardware condition. We can lockup the kernel if there is some sort
>>of
>>hardware problem.
> Agreed but why try more than once? Needs a comment...
>>
>>
>>>
>>> Anyhow, even if it's obvious from the datasheet, that sort of 'magic'
>>needs
>>> an explanation comment...

Agree we need a comment on that. As for the number of retries I can see
drivers doing from 5 to 100 (re)tries:


humidity/si7005.c
44:     int tries = 50;
55:     while (tries-- > 0) {

temperature/tmp006.c
55:     int tries = 50;
57:     while (tries-- > 0) {

dac/mcp4725.c
76:     int tries = 20;
99:     while (tries--) {
111:    if (tries < 0) {

pressure/mpl3115.c
49:     int ret, tries = 15;
57:     while (tries-- > 0) {

ight/ltr501.c
329:    int tries = 100;
332:    while (tries--) {

proximity/pulsedlight-lidar-lite-v2.c
160:    int tries = 10;

accel/mma9551_core.c
75:#define MMA9551_I2C_READ_RETRIES     5

Daniel.

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[PATCH v3] iio: accel: Add support for Freescale MMA7660FC Constantin Musca <constantin.musca@intel.com> - 2016-04-29 14:20 +0200
  Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Martin Kepplinger <martink@posteo.de> - 2016-04-29 15:10 +0200
    Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Constantin Musca <constantin.musca@intel.com> - 2016-04-29 15:40 +0200
    Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Jonathan Cameron <jic23@kernel.org> - 2016-05-01 23:30 +0200
      Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Jonathan Cameron <jic23@kernel.org> - 2016-05-04 16:40 +0200
  Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Jonathan Cameron <jic23@kernel.org> - 2016-05-01 23:30 +0200
    Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Daniel Baluta <daniel.baluta@intel.com> - 2016-05-03 09:30 +0200
      Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Jonathan Cameron <jic23@jic23.retrosnub.co.uk> - 2016-05-03 12:50 +0200
        Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Daniel Baluta <daniel.baluta@intel.com> - 2016-05-03 13:00 +0200
          Re: [PATCH v3] iio: accel: Add support for Freescale MMA7660FC Jonathan Cameron <jic23@kernel.org> - 2016-05-04 16:40 +0200

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