linux-kernel - Re: [PATCH v1 1/2] iio: adc: ti-adc128s052: add support for adc121s021

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Message-ID: <aGCCIwknL25yAyHL@dev-linux>
Date: Sat, 28 Jun 2025 17:00:35 -0700
From: Sukrut Bellary <sbellary@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Matti Vaittinen <mazziesaccount@...il.com>,
	Lothar Rubusch <l.rubusch@...il.com>, dlechner@...libre.com,
	nuno.sa@...log.com, andy@...nel.org, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] iio: adc: ti-adc128s052: add support for
 adc121s021

On Thu, Jun 26, 2025 at 07:28:02PM +0100, Jonathan Cameron wrote:
> On Thu, 26 Jun 2025 08:24:41 +0300
> Matti Vaittinen <mazziesaccount@...il.com> wrote:
> 
> > Hi Lothar,
> > 
> > On 25/06/2025 20:02, Lothar Rubusch wrote:
> > > Add support for the single channel variant(s) of this ADC.
> > > 
> > > Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>  
> > 
> > Thanks for this addition. In principle, this looks good to me but I am 
> > afraid there is another colliding series being worked on:
> > 
> > https://lore.kernel.org/all/20250614091504.575685-3-sbellary@baylibre.com/
> > 
> > Maybe you can align the effort with Sukrut?
> +CC Sukrut.
> 
> > 
> > What I specifically like (and think is the right thing to do) in 
> > Sukrut's series is replacing the 'adc122s021_channels' -array with 
> > individual structures. In my opinion the array is just unnecessary 
> > complexity and individual structures are simpler.
> > 
> > Other than that, this looks good to me.
> 
> 
> Sukrut, perhaps you could add this to the end of your series, rebased
> to those changes?  Would save a synchronization step for your v5 (and
> later if needed)
> 
> No problem if not, but I agree with Matti that we should take your
> series first.
> 
> Jonathan
>
Sure, I will add these adc121s0xx to the end of my v5.
Thanks.

> 
> > 
> > Yours,
> > 	-- Matti
> > 
> > 
> > > ---
> > >   drivers/iio/adc/ti-adc128s052.c | 17 ++++++++++++++++-
> > >   1 file changed, 16 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
> > > index 1b46a8155803..cf271c39e663 100644
> > > --- a/drivers/iio/adc/ti-adc128s052.c
> > > +++ b/drivers/iio/adc/ti-adc128s052.c
> > > @@ -7,6 +7,7 @@
> > >    * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
> > >    * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
> > >    * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
> > > + * https://www.ti.com/lit/ds/symlink/adc121s021.pdf
> > >    */
> > >   
> > >   #include <linux/cleanup.h>
> > > @@ -110,6 +111,10 @@ static const struct iio_chan_spec adc128s052_channels[] = {
> > >   	ADC128_VOLTAGE_CHANNEL(7),
> > >   };
> > >   
> > > +static const struct iio_chan_spec adc121s021_channels[] = {
> > > +	ADC128_VOLTAGE_CHANNEL(0),
> > > +};
> > > +
> > >   static const struct iio_chan_spec adc122s021_channels[] = {
> > >   	ADC128_VOLTAGE_CHANNEL(0),
> > >   	ADC128_VOLTAGE_CHANNEL(1),
> > > @@ -143,6 +148,10 @@ static const struct adc128_configuration adc128_config[] = {
> > >   		.refname = "vdd",
> > >   		.other_regulators = &bd79104_regulators,
> > >   		.num_other_regulators = 1,
> > > +	}, {
> > > +		.channels = adc121s021_channels,
> > > +		.num_channels = ARRAY_SIZE(adc121s021_channels),
> > > +		.refname = "vref",
> > >   	},
> > >   };  
> > 
> > I'd love seeing this array split to individual structs.
> > 
> > >   
> > > @@ -207,7 +216,10 @@ static const struct of_device_id adc128_of_match[] = {
> > >   	{ .compatible = "ti,adc124s051", .data = &adc128_config[2] },
> > >   	{ .compatible = "ti,adc124s101", .data = &adc128_config[2] },
> > >   	{ .compatible = "rohm,bd79104", .data = &adc128_config[3] },
> > > -	{ }
> > > +	{ .compatible = "ti,adc121s021", .data = &adc128_config[4] },
> > > +	{ .compatible = "ti,adc121s051", .data = &adc128_config[4] },
> > > +	{ .compatible = "ti,adc121s101", .data = &adc128_config[4] },
> > > +	{ },
> > >   };
> > >   MODULE_DEVICE_TABLE(of, adc128_of_match);
> > >   
> > > @@ -220,6 +232,9 @@ static const struct spi_device_id adc128_id[] = {
> > >   	{ "adc124s051", (kernel_ulong_t)&adc128_config[2] },
> > >   	{ "adc124s101", (kernel_ulong_t)&adc128_config[2] },
> > >   	{ "bd79104", (kernel_ulong_t)&adc128_config[3] },
> > > +	{ "adc121s021", (kernel_ulong_t)&adc128_config[4] },
> > > +	{ "adc121s051", (kernel_ulong_t)&adc128_config[4] },
> > > +	{ "adc121s101", (kernel_ulong_t)&adc128_config[4] },
> > >   	{ }
> > >   };
> > >   MODULE_DEVICE_TABLE(spi, adc128_id);  
> > 
>