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 23C12550DA6; Wed, 9 Sep 2026 14:01:11 +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=1788962472; cv=none; b=tRmlzISYB18+AEX5xUR7j8A7YySI97X6Y2p/vn+3UJ4XG/IfVSTHHaN5aY7xuxojKL38oqSiCgCA97ye/+gafHX5ai7nUqip/f13y+K22VqRyTYORGzmYEH8qddm0G9+TIzCrJTddOKcFZK/MIfpuOAT6ygWO65nV9Fak4J1U/0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788962472; c=relaxed/simple; bh=Cwd5IIktKW7TSLa+asfk92i09oPYi7XWL8hzY61+jS4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WGhjnzpkHAeHOetpIGG36mTXo0NiEluWZlu+HbcTFla/0gCfim08dqHMsfM+wgGdyyUftuR3FCOwAn+rVkrcI9mOqPyiGHW5UWAQWdx7qKBlMZ22LZWGIju9YkADdSSqhcYAbA5oiPJdjqtEGXn3YM7sA6AV4WefHrfhUIr6tGM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZmqZvvdq; 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="ZmqZvvdq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E7301F00A3A; Wed, 9 Sep 2026 14:01:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788962470; bh=qxc6Kxy6MU6SQjRrLtCd6h5K97PO82dZrjD7JGk0aX4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZmqZvvdqWxBFAvGjVM64Ao+cvHqHyK2ZYAZwicvWKq9vVSNKMOrBuUINnaE2eXTC6 erWU70Wg5/hb7Cy69b5aypNy5rxoJaiOVnbxgRoJThK+vQkdfsrK0wglqewZSKlCtt jmEKtsljJuVl61IUPWY5eCtHyNX7xj7C7XU4ye2A= 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 7.2 260/556] iio: adc: adi-axi-adc: add data size support for AD408X backend Date: Wed, 9 Sep 2026 15:39:00 +0200 Message-ID: <20260909134239.675052751@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909134230.441546314@linuxfoundation.org> References: <20260909134230.441546314@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 7.2-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 @@ -53,6 +53,10 @@ #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) @@ -436,6 +440,31 @@ 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) { @@ -659,6 +688,7 @@ 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),