[PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[George Stark]

According to Amlogic custom kernels ADC of axg SoC family has
vref_select and requires this setting to work nominally and thus
needs a separate config.

Signed-off-by: George Stark <gnstark@salutedevices.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 drivers/iio/adc/meson_saradc.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index db280da9edbf..34555a85f131 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -1242,6 +1242,20 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
 	.cmv_select = 1,
 };
 
+static const struct meson_sar_adc_param meson_sar_adc_axg_param = {
+	.has_bl30_integration = true,
+	.clock_rate = 1200000,
+	.bandgap_reg = MESON_SAR_ADC_REG11,
+	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
+	.resolution = 12,
+	.disable_ring_counter = 1,
+	.has_reg11 = true,
+	.vref_volatge = 1,
+	.has_vref_select = true,
+	.vref_select = VREF_VDDA,
+	.cmv_select = 1,
+};
+
 static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
 	.has_bl30_integration = false,
 	.clock_rate = 1200000,
@@ -1286,7 +1300,7 @@ static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
 };
 
 static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
-	.param = &meson_sar_adc_gxl_param,
+	.param = &meson_sar_adc_axg_param,
 	.name = "meson-axg-saradc",
 };
 
-- 
2.38.4

Re: [PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[Jonathan Cameron]

On Wed, 22 Nov 2023 10:47:41 +0300
George Stark <gnstark@salutedevices.com> wrote:

> According to Amlogic custom kernels ADC of axg SoC family has
> vref_select and requires this setting to work nominally and thus
> needs a separate config.
> 
> Signed-off-by: George Stark <gnstark@salutedevices.com>
> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Is this a fix?  If so, please provide a fixes tag.
Or is it aligning with the vendor kernels and we don't know if
it's strictly necessary or not?

> ---
>  drivers/iio/adc/meson_saradc.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
> index db280da9edbf..34555a85f131 100644
> --- a/drivers/iio/adc/meson_saradc.c
> +++ b/drivers/iio/adc/meson_saradc.c
> @@ -1242,6 +1242,20 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
>  	.cmv_select = 1,
>  };
>  
> +static const struct meson_sar_adc_param meson_sar_adc_axg_param = {
> +	.has_bl30_integration = true,
> +	.clock_rate = 1200000,
> +	.bandgap_reg = MESON_SAR_ADC_REG11,
> +	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
> +	.resolution = 12,
> +	.disable_ring_counter = 1,
> +	.has_reg11 = true,
> +	.vref_volatge = 1,
> +	.has_vref_select = true,
> +	.vref_select = VREF_VDDA,
> +	.cmv_select = 1,
> +};
> +
>  static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
>  	.has_bl30_integration = false,
>  	.clock_rate = 1200000,
> @@ -1286,7 +1300,7 @@ static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
>  };
>  
>  static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
> -	.param = &meson_sar_adc_gxl_param,
> +	.param = &meson_sar_adc_axg_param,
>  	.name = "meson-axg-saradc",
>  };
>  

Re: [PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[George Stark]

Hello Jonathan

Thanks for the review.

On 11/25/23 20:25, Jonathan Cameron wrote:
> On Wed, 22 Nov 2023 10:47:41 +0300
> George Stark <gnstark@salutedevices.com> wrote:
> 
>> According to Amlogic custom kernels ADC of axg SoC family has
>> vref_select and requires this setting to work nominally and thus
>> needs a separate config.
>>
>> Signed-off-by: George Stark <gnstark@salutedevices.com>
>> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
> 
> Is this a fix?  If so, please provide a fixes tag.
Actually yes, these changes could be done in the patch that introduced
new configuration parameters.

> Or is it aligning with the vendor kernels and we don't know if
> it's strictly necessary or not?
I do know it's necessary if we want kernel driver to be independent from 
ADC initialization in vendor u-boot code. I have Amlogic a113x device 
(axg family) and can provide test results w and w/o this patch.

> 
>> ---
>>   drivers/iio/adc/meson_saradc.c | 16 +++++++++++++++-
>>   1 file changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
>> index db280da9edbf..34555a85f131 100644
>> --- a/drivers/iio/adc/meson_saradc.c
>> +++ b/drivers/iio/adc/meson_saradc.c
>> @@ -1242,6 +1242,20 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
>>   	.cmv_select = 1,
>>   };
>>   
>> +static const struct meson_sar_adc_param meson_sar_adc_axg_param = {
>> +	.has_bl30_integration = true,
>> +	.clock_rate = 1200000,
>> +	.bandgap_reg = MESON_SAR_ADC_REG11,
>> +	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
>> +	.resolution = 12,
>> +	.disable_ring_counter = 1,
>> +	.has_reg11 = true,
>> +	.vref_volatge = 1,
>> +	.has_vref_select = true,
>> +	.vref_select = VREF_VDDA,
>> +	.cmv_select = 1,
>> +};
>> +
>>   static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
>>   	.has_bl30_integration = false,
>>   	.clock_rate = 1200000,
>> @@ -1286,7 +1300,7 @@ static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
>>   };
>>   
>>   static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
>> -	.param = &meson_sar_adc_gxl_param,
>> +	.param = &meson_sar_adc_axg_param,
>>   	.name = "meson-axg-saradc",
>>   };
>>   
> 

-- 
Best regards
George

Re: [PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[Jonathan Cameron]

On Mon, 27 Nov 2023 22:17:33 +0300
George Stark <gnstark@salutedevices.com> wrote:

> Hello Jonathan
> 
> Thanks for the review.
> 
> On 11/25/23 20:25, Jonathan Cameron wrote:
> > On Wed, 22 Nov 2023 10:47:41 +0300
> > George Stark <gnstark@salutedevices.com> wrote:
> >   
> >> According to Amlogic custom kernels ADC of axg SoC family has
> >> vref_select and requires this setting to work nominally and thus
> >> needs a separate config.
> >>
> >> Signed-off-by: George Stark <gnstark@salutedevices.com>
> >> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>  
> > 
> > Is this a fix?  If so, please provide a fixes tag.  
> Actually yes, these changes could be done in the patch that introduced
> new configuration parameters.
> 
> > Or is it aligning with the vendor kernels and we don't know if
> > it's strictly necessary or not?  
> I do know it's necessary if we want kernel driver to be independent from 
> ADC initialization in vendor u-boot code. I have Amlogic a113x device 
> (axg family) and can provide test results w and w/o this patch.

Definitely best to not rely on firmware. 

So send a Fixes tag for this and I'll apply it as a fix
(you get to figure out which patch it fixed :)

Jonathan

> 
> >   
> >> ---
> >>   drivers/iio/adc/meson_saradc.c | 16 +++++++++++++++-
> >>   1 file changed, 15 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
> >> index db280da9edbf..34555a85f131 100644
> >> --- a/drivers/iio/adc/meson_saradc.c
> >> +++ b/drivers/iio/adc/meson_saradc.c
> >> @@ -1242,6 +1242,20 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
> >>   	.cmv_select = 1,
> >>   };
> >>   
> >> +static const struct meson_sar_adc_param meson_sar_adc_axg_param = {
> >> +	.has_bl30_integration = true,
> >> +	.clock_rate = 1200000,
> >> +	.bandgap_reg = MESON_SAR_ADC_REG11,
> >> +	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
> >> +	.resolution = 12,
> >> +	.disable_ring_counter = 1,
> >> +	.has_reg11 = true,
> >> +	.vref_volatge = 1,
> >> +	.has_vref_select = true,
> >> +	.vref_select = VREF_VDDA,
> >> +	.cmv_select = 1,
> >> +};
> >> +
> >>   static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
> >>   	.has_bl30_integration = false,
> >>   	.clock_rate = 1200000,
> >> @@ -1286,7 +1300,7 @@ static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
> >>   };
> >>   
> >>   static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
> >> -	.param = &meson_sar_adc_gxl_param,
> >> +	.param = &meson_sar_adc_axg_param,
> >>   	.name = "meson-axg-saradc",
> >>   };
> >>     
> >   
> 

Re: [PATCH v2 1/1] iio: adc: meson: add separate config for axg SoC family

[George Stark]

Hello Jonathan

On 12/1/23 21:08, Jonathan Cameron wrote:
> On Mon, 27 Nov 2023 22:17:33 +0300
> George Stark <gnstark@salutedevices.com> wrote:
> 
>> Hello Jonathan
>>
>> Thanks for the review.
>>
>> On 11/25/23 20:25, Jonathan Cameron wrote:
>>> On Wed, 22 Nov 2023 10:47:41 +0300
>>> George Stark <gnstark@salutedevices.com> wrote:
>>>    
>>>> According to Amlogic custom kernels ADC of axg SoC family has
>>>> vref_select and requires this setting to work nominally and thus
>>>> needs a separate config.
>>>>
>>>> Signed-off-by: George Stark <gnstark@salutedevices.com>
>>>> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
>>>
>>> Is this a fix?  If so, please provide a fixes tag.
>> Actually yes, these changes could be done in the patch that introduced
>> new configuration parameters.
>>
>>> Or is it aligning with the vendor kernels and we don't know if
>>> it's strictly necessary or not?
>> I do know it's necessary if we want kernel driver to be independent from
>> ADC initialization in vendor u-boot code. I have Amlogic a113x device
>> (axg family) and can provide test results w and w/o this patch.
> 
> Definitely best to not rely on firmware.
> 
> So send a Fixes tag for this and I'll apply it as a fix
> (you get to figure out which patch it fixed :)

The patch is ready :)

https://lore.kernel.org/lkml/20231127235558.71995-1-gnstark@salutedevices.com/


> 
> Jonathan
> 
>>
>>>    
>>>> ---
>>>>    drivers/iio/adc/meson_saradc.c | 16 +++++++++++++++-
>>>>    1 file changed, 15 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
>>>> index db280da9edbf..34555a85f131 100644
>>>> --- a/drivers/iio/adc/meson_saradc.c
>>>> +++ b/drivers/iio/adc/meson_saradc.c
>>>> @@ -1242,6 +1242,20 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
>>>>    	.cmv_select = 1,
>>>>    };
>>>>    
>>>> +static const struct meson_sar_adc_param meson_sar_adc_axg_param = {
>>>> +	.has_bl30_integration = true,
>>>> +	.clock_rate = 1200000,
>>>> +	.bandgap_reg = MESON_SAR_ADC_REG11,
>>>> +	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
>>>> +	.resolution = 12,
>>>> +	.disable_ring_counter = 1,
>>>> +	.has_reg11 = true,
>>>> +	.vref_volatge = 1,
>>>> +	.has_vref_select = true,
>>>> +	.vref_select = VREF_VDDA,
>>>> +	.cmv_select = 1,
>>>> +};
>>>> +
>>>>    static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
>>>>    	.has_bl30_integration = false,
>>>>    	.clock_rate = 1200000,
>>>> @@ -1286,7 +1300,7 @@ static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
>>>>    };
>>>>    
>>>>    static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
>>>> -	.param = &meson_sar_adc_gxl_param,
>>>> +	.param = &meson_sar_adc_axg_param,
>>>>    	.name = "meson-axg-saradc",
>>>>    };
>>>>      
>>>    
>>
> 

-- 
Best regards
George