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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 5614622812f47-3e66119120dsm940758b6e.12.2024.11.01.12.52.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Nov 2024 12:52:52 -0700 (PDT) Message-ID: <0f4a6e40-a7c8-43e4-8596-4fa495159378@baylibre.com> Date: Fri, 1 Nov 2024 14:52:50 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 4/6] iio: adc: adi-axi-adc: set data format To: Antoniu Miclaus , jic23@kernel.org, conor+dt@kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org References: <20241101112358.22996-1-antoniu.miclaus@analog.com> <20241101112358.22996-5-antoniu.miclaus@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: <20241101112358.22996-5-antoniu.miclaus@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/1/24 6:23 AM, Antoniu Miclaus wrote: > Add support for selecting the data format within the AXI ADC ip. > > Signed-off-by: Antoniu Miclaus > --- > no changes in v5. > drivers/iio/adc/adi-axi-adc.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c > index f6475bc93796..6f658d9b4c9d 100644 > --- a/drivers/iio/adc/adi-axi-adc.c > +++ b/drivers/iio/adc/adi-axi-adc.c > @@ -45,6 +45,9 @@ > #define ADI_AXI_ADC_REG_CTRL 0x0044 > #define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1) > > +#define ADI_AXI_ADC_REG_CNTRL_3 0x004c > +#define ADI_AXI_ADC_CNTRL_3_CUSTOM_CTRL_MSK GENMASK(7, 0) > + > #define ADI_AXI_ADC_REG_DRP_STATUS 0x0074 > #define ADI_AXI_ADC_DRP_LOCKED BIT(17) > > @@ -312,6 +315,24 @@ static int axi_adc_interface_type_get(struct iio_backend *back, > return 0; > } > > +static int axi_adc_data_size_set(struct iio_backend *back, ssize_t size) > +{ > + struct adi_axi_adc_state *st = iio_backend_get_priv(back); > + unsigned int val; > + > + if (size <= 20) > + val = 0; > + else if (size <= 24) > + val = 1; > + else if (size <= 32) > + val = 3; Should these be exact matches instead of "<="? Also, what would val = 2 mean? Perhaps we need some macros to explain the meanings of these values. The docs linked below give the meaning for a different chip, but not AD485x. > + else > + return -EINVAL; > + > + return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3, > + ADI_AXI_ADC_CNTRL_3_CUSTOM_CONTROL_MSK, val); My understanding is that the use of REG_CHAN_CNTRL_3 is different for every HDL project depending on what (frontend) chip is is being used with. In the AXI DAC, we added a new compatible string for this (and other reasons). Not sure if we need to go that far here, but I would at least put a comment here explaining that this use of the register is highly specific to the AXI AD485x variant [1] of the AXI ADC IP core. Ideally though, there should be an ID register that we can read to get this info or use a different DT compatible string. [1]: http://analogdevicesinc.github.io/hdl/library/axi_ad485x/index.html > +} > + > static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back, > struct iio_dev *indio_dev) > { > @@ -360,6 +381,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = { > .test_pattern_set = axi_adc_test_pattern_set, > .chan_status = axi_adc_chan_status, > .interface_type_get = axi_adc_interface_type_get, > + .data_size_set = axi_adc_data_size_set, > .debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access), > .debugfs_print_chan_status = iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status), > };