From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 988D45867FE; Wed, 9 Sep 2026 14:23:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788963803; cv=none; b=ULvfjpi/CrhYtTOP4ptZlRPIGG4f00zMx/6AILzY71H45j0WmFvzojW17G0PQUsSD/jTBcHqqSffe2dk+XV9sXxw6Ys+UzDYgtUEE1eQ+eZXJ5V5nKBSQFUIVL5PsHLgSpJojrKzbxrQF9Urqndv7TwCaimxHP57KdcjTeMjJl0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788963803; c=relaxed/simple; bh=Ekb6XGPkzTZzoFCh5hPk2FsxySoQ89T2bpPqZi+H3pY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gJl/p53GUGqs3I5Z3ESOqJ/b6fqvt428XRleHPmjk0SoT1V2141lNJp+o0jdsk3irOP3IJ8JZiz84VooAx/glmRKkEhmuWCUuDrSq15jlvu6aDqAkqwy998trM/NerFvI4ynm0MuCPQeToiuXPBSyPCwtMRqMvx6rEv9qfp9PjA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=F365GgxW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="F365GgxW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F299B1F00A3D; Wed, 9 Sep 2026 14:23:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788963802; bh=QHL8IzfenM5oMDYaPxWSoCglZJ+dfq6TjOsXMudCiqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=F365GgxWZp/k0EyB8suHqLrRDW2MM2jZupOOX9MaSLKZaK2niuPQgQqLuDdMk5+1c owApi+O4mKTu1qGiDaokBhN3npjcXvm8k+0XKX26KAOCkj+OzYN/WN/G/COZO/oIyq VELehonfUmxc8a8LQ0b+wiDKiOLU/0A9QYuJ8hZ8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Antoniu Miclaus , David Lechner , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 6.18 203/583] iio: adc: adi-axi-adc: add data size support for AD408X backend Date: Wed, 9 Sep 2026 15:38:08 +0200 Message-ID: <20260909134245.182564941@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909134237.773280130@linuxfoundation.org> References: <20260909134237.773280130@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Antoniu Miclaus commit 60f6f7fd5f89c7f55991c5dc59f3ccc74cd6efd7 upstream. 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 Reviewed-by: David Lechner Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/adi-axi-adc.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) --- 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_se 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) { @@ -661,6 +690,7 @@ static const struct iio_backend_ops adi_ .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),