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Mon, 13 Jul 2026 04:41:24 -0400 From: Antoniu Miclaus To: =?UTF-8?q?Nuno=20S=C3=A1?= , Michael Hennerich , Antoniu Miclaus , Jonathan Cameron , David Lechner , , , Subject: [PATCH v2 1/2] iio: adc: adi-axi-adc: add data size support for AD408X backend Date: Mon, 13 Jul 2026 11:40:42 +0300 Message-ID: <20260713084043.10856-2-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260713084043.10856-1-antoniu.miclaus@analog.com> References: <20260713084043.10856-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=eLYjSnp1 c=1 sm=1 tr=0 ts=6a54a4bb cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=uXIjobp8t2wMuQ0fPvqm:22 a=gAnH3GRIAAAA:8 a=jyUTmoUkxtoYOXpmdiwA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEzMDA5MCBTYWx0ZWRfX/ZgSDWmLKEUE ete7+j5G8FRQDgSwwe/qbSnqRVV2tfhOLl5oalF1v0CPnSmB6Ql8C58Dfjop6lVTO9HJXF3UVDV ZRs0dCFYupgAlCfofjmufAVulAzBfqcpVtw1PFTDc5X6c/Voqlq+ X-Proofpoint-GUID: 51bMXLgHx5V7XKYAIE6qKXaNaHyWFB_2 X-Proofpoint-ORIG-GUID: 51bMXLgHx5V7XKYAIE6qKXaNaHyWFB_2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEzMDA5MCBTYWx0ZWRfX9CdTrbv5YAsl U/HXzzkUSg6zWUXVju9a0q254lLHiUOoMNiyHzi3S+Z+HYOA5AQOe/qkBDRfKgAuaeUnesBcbPT rsbDtEZGIL9WtAjrTgD68gxJ/JlCxog6XoCaiQGxuBdARZAIBuPt+YCW/sLMiNxe2As0EjZOFXM EYG4TE1HuIyq9qd9ow30qyyVJjnbR9NSCV/u6S/ocg+39BYWZXutpDRTFznh1aNCaYx5/rEdgAe YcPD+ugW+mPERVFhEDU9B7cq/sS1d8Tr61pcpyFVArAivWN30NlRLWfb5GGgiwzCubCxrvQiq/E gqZ9mZwi9RG7MziWoVIQBOSi5k8c64qROQl5LAJN8hY2sShrQ7Pz2tHQ6s5Ayw6/3Rs2ccLuRGv IPvyKEbHfrC5LKMwZylRicXUZZb3qQfj19n11JvAwFGSLIKy02aa19M2PG8PzT7O7ySuOrCWu1y bJinDCHhSKfE4zjIDdQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-13_02,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 phishscore=0 adultscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 spamscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607130090 The AD408X AXI core can pack the sample data on the bus using different word widths. Expose this through the data_size_set backend operation so that frontends can program the packet format field (bits 3:2 of the CNTRL_3 register) according to the ADC resolution: 20-bit, 16-bit and 14-bit map to packet format values 0, 1 and 2 respectively. Signed-off-by: Antoniu Miclaus --- changes in v2: - No changes. drivers/iio/adc/adi-axi-adc.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c index ced0a2321ecf..aac6f4a0705e 100644 --- a/drivers/iio/adc/adi-axi-adc.c +++ b/drivers/iio/adc/adi-axi-adc.c @@ -54,6 +54,10 @@ #define AXI_AD485X_PACKET_FORMAT_24BIT 0x1 #define AXI_AD485X_PACKET_FORMAT_32BIT 0x2 #define AXI_AD408X_CNTRL_3_FILTER_EN_MSK BIT(0) +#define AXI_AD408X_CNTRL_3_PACKET_FORMAT_MSK GENMASK(3, 2) +#define AXI_AD408X_PACKET_FORMAT_20BIT 0x0 +#define AXI_AD408X_PACKET_FORMAT_16BIT 0x1 +#define AXI_AD408X_PACKET_FORMAT_14BIT 0x2 #define ADI_AXI_ADC_REG_SYNC_STATUS 0x0068 #define ADI_AXI_ADC_SYNC_STATUS_ADC_SYNC_MSK BIT(0) @@ -437,6 +441,31 @@ static int axi_adc_ad408x_filter_type_set(struct iio_backend *back, AXI_AD408X_CNTRL_3_FILTER_EN_MSK); } +static int axi_adc_ad408x_data_size_set(struct iio_backend *back, + unsigned int size) +{ + struct adi_axi_adc_state *st = iio_backend_get_priv(back); + unsigned int val; + + switch (size) { + case 20: + val = AXI_AD408X_PACKET_FORMAT_20BIT; + break; + case 16: + val = AXI_AD408X_PACKET_FORMAT_16BIT; + break; + case 14: + val = AXI_AD408X_PACKET_FORMAT_14BIT; + break; + default: + return -EINVAL; + } + + return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3, + AXI_AD408X_CNTRL_3_PACKET_FORMAT_MSK, + FIELD_PREP(AXI_AD408X_CNTRL_3_PACKET_FORMAT_MSK, val)); +} + static int axi_adc_ad408x_interface_data_align(struct iio_backend *back, u32 timeout_us) { @@ -660,6 +689,7 @@ static const struct iio_backend_ops adi_ad408x_ops = { .free_buffer = axi_adc_free_buffer, .data_sample_trigger = axi_adc_data_sample_trigger, .filter_type_set = axi_adc_ad408x_filter_type_set, + .data_size_set = axi_adc_ad408x_data_size_set, .interface_data_align = axi_adc_ad408x_interface_data_align, .num_lanes_set = axi_adc_num_lanes_set, .debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access), -- 2.43.0