linux-kernel - [PATCH v5 1/6] dt-bindings: iio: filter: Add lpf/hpf freq margins

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Message-ID: <20250306183314.150253-1-sam.winchenbach@framepointer.org>
Date: Thu,  6 Mar 2025 13:33:09 -0500
From: Sam Winchenbach <sam.winchenbach@...mepointer.org>
To: linux-kernel@...r.kernel.org
Cc: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	antoniu.miclaus@...log.com,
	jic23@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	sam.winchenbach@...mepointer.org,
	bpellegrino@...a.org
Subject: [PATCH v5 1/6] dt-bindings: iio: filter: Add lpf/hpf freq margins

Adds two properties to add a margin when automatically finding the
corner frequencies.

Signed-off-by: Sam Winchenbach <sam.winchenbach@...mepointer.org>
---
 .../bindings/iio/filter/adi,admv8818.yaml     | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
index b77e855bd594..3f9c61547a78 100644
--- a/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
+++ b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
@@ -44,6 +44,27 @@ properties:
   '#clock-cells':
     const: 0
 
+
+  adi,lpf-margin-hz:
+    description:
+      Sets the minimum distance (in Hz) between the fundamental
+      frequency of `rf_in` and the corner frequency of the low-pass, output
+      filter when operatred in 'auto' mode. The selected low-pass corner
+      frequency will be greater than, or equal to, `rf_in` + `lpf-margin-hz`. If
+      not setting is found that satisfies this relationship the filter will be
+      put into 'bypass'.
+    default: 0
+
+  adi,hpf-margin-hz:
+    description:
+      Sets the minimum distance (in Hz) between the fundamental
+      frequency of `rf_in` and the corner frequency of the high-pass, input
+      filter when operatred in 'auto' mode. The selected high-pass corner
+      frequency will be less than, or equal to, `rf_in` - `hpf-margin-hz`. If
+      not setting is found that satisfies this relationship the filter will be
+      put into 'bypass'.
+    default: 0
+
 required:
   - compatible
   - reg
@@ -61,6 +82,8 @@ examples:
         spi-max-frequency = <10000000>;
         clocks = <&admv8818_rfin>;
         clock-names = "rf_in";
+        adi,lpf-margin-hz = /bits/ 64 <30000000>;
+        adi,hpf-margin-hz = /bits/ 64 <30000000>;
       };
     };
 ...
-- 
2.48.1