linux-kernel - Re: [PATCH 32/38] iio: accel-core: st: Move LSM303DLH into correct group

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Date:	Mon, 16 Sep 2013 11:19:19 +0200
From:	Denis CIOCCA <denis.ciocca@...com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 32/38] iio: accel-core: st: Move LSM303DLH into correct
 group

Hi Lee,
>> On 09/10/13 13:49, Lee Jones wrote:
>>> The LSM303DLH's WAI (WhoAmI) is 0x33, meaning it should be enabled by
>>> Accel Sensor group one. For the device to probe without error, we'll
>>> need to ensure it's registered with the correct WAI.
>>>
>>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>> You clearly have a better datasheet than I have as for that part it doesn't even claim to
>> have the relevant register to read a who am I from.
>>
>> Now that datasheet does list odr values as 50, 100, 400 1000 which would put it where it originally
>> was in these tables.
>>
>> http://www.st.com/web/en/resource/technical/document/datasheet/CD00260288.pdf
>>
>> I haven't checked other elements...
>>
>> I'm confused but suspect we may need another type entry to deal with this one.
> Hmmm... on initial thought, I don't know how we can handle this one. I
> assumed the WAIs were a one-stop-shop for device identification. I also
> thought that they would only match if the functionality and register
> maps would be the same.
>
> I'll touch base with Denis on this, perhaps he can shed some light.
>
I've just checked, the WAI is 0x32. It was correct...Are you sure that 
you use the LSM303DLH?

Denis



>>> ---
>>>   drivers/iio/accel/st_accel_core.c | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
>>> index ea62291..03a2b6b 100644
>>> --- a/drivers/iio/accel/st_accel_core.c
>>> +++ b/drivers/iio/accel/st_accel_core.c
>>> @@ -170,6 +170,7 @@ static const struct st_sensors st_accel_sensors[] = {
>>>   			[2] = LSM330D_ACCEL_DEV_NAME,
>>>   			[3] = LSM330DL_ACCEL_DEV_NAME,
>>>   			[4] = LSM330DLC_ACCEL_DEV_NAME,
>>> +			[5] = LSM303DLH_ACCEL_DEV_NAME,
>>>   		},
>>>   		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
>>>   		.odr = {
>>> @@ -238,8 +239,7 @@ static const struct st_sensors st_accel_sensors[] = {
>>>   		.sensors_supported = {
>>>   			[0] = LIS331DLH_ACCEL_DEV_NAME,
>>>   			[1] = LSM303DL_ACCEL_DEV_NAME,
>>> -			[2] = LSM303DLH_ACCEL_DEV_NAME,
>>> -			[3] = LSM303DLM_ACCEL_DEV_NAME,
>>> +			[2] = LSM303DLM_ACCEL_DEV_NAME,
>>>   		},
>>>   		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
>>>   		.odr = {
>>>