From: Zev Weiss <zev@bewilderbeest.net> To: linux-i2c@vger.kernel.org, Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org Cc: Zev Weiss <zev@bewilderbeest.net>, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>, Peter Rosin <peda@axentia.se> Subject: [PATCH v2 2/2] dt-bindings: i2c: add nxp,pca9541 release-delay-us property Date: Mon, 31 Jan 2022 16:18:10 -0800 [thread overview] Message-ID: <20220201001810.19516-3-zev@bewilderbeest.net> (raw) In-Reply-To: <20220201001810.19516-1-zev@bewilderbeest.net> This property can be used to reduce arbitration overhead on busy i2c busses by retaining ownership for a brief period in anticipation of another transaction in the near future. Signed-off-by: Zev Weiss <zev@bewilderbeest.net> --- Documentation/devicetree/bindings/i2c/nxp,pca9541.txt | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt index 42bfc09c8918..9e8819593271 100644 --- a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt +++ b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt @@ -6,6 +6,14 @@ Required Properties: - reg: The I2C address of the device. +Optional Properties: + + - release-delay-us: the number of microseconds to delay before + releasing the bus after a transaction. If unspecified the default + is zero (the bus is released immediately). Non-zero values can + reduce arbitration overhead for back-to-back transactions, at the + cost of delaying the other master's access to the bus. + The following required properties are defined externally: - I2C arbitration bus node. See i2c-arb.txt in this directory. @@ -16,6 +24,7 @@ Example: i2c-arbitrator@74 { compatible = "nxp,pca9541"; reg = <0x74>; + release-delay-us = <20000>; i2c-arb { #address-cells = <1>; -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Zev Weiss <zev@bewilderbeest.net> To: linux-i2c@vger.kernel.org, Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org Cc: openbmc@lists.ozlabs.org, Guenter Roeck <linux@roeck-us.net>, linux-kernel@vger.kernel.org, Zev Weiss <zev@bewilderbeest.net>, Peter Rosin <peda@axentia.se> Subject: [PATCH v2 2/2] dt-bindings: i2c: add nxp, pca9541 release-delay-us property Date: Mon, 31 Jan 2022 16:18:10 -0800 [thread overview] Message-ID: <20220201001810.19516-3-zev@bewilderbeest.net> (raw) In-Reply-To: <20220201001810.19516-1-zev@bewilderbeest.net> This property can be used to reduce arbitration overhead on busy i2c busses by retaining ownership for a brief period in anticipation of another transaction in the near future. Signed-off-by: Zev Weiss <zev@bewilderbeest.net> --- Documentation/devicetree/bindings/i2c/nxp,pca9541.txt | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt index 42bfc09c8918..9e8819593271 100644 --- a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt +++ b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt @@ -6,6 +6,14 @@ Required Properties: - reg: The I2C address of the device. +Optional Properties: + + - release-delay-us: the number of microseconds to delay before + releasing the bus after a transaction. If unspecified the default + is zero (the bus is released immediately). Non-zero values can + reduce arbitration overhead for back-to-back transactions, at the + cost of delaying the other master's access to the bus. + The following required properties are defined externally: - I2C arbitration bus node. See i2c-arb.txt in this directory. @@ -16,6 +24,7 @@ Example: i2c-arbitrator@74 { compatible = "nxp,pca9541"; reg = <0x74>; + release-delay-us = <20000>; i2c-arb { #address-cells = <1>; -- 2.34.1
next prev parent reply other threads:[~2022-02-01 0:18 UTC|newest] Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-02-01 0:18 [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support Zev Weiss 2022-02-01 0:18 ` Zev Weiss 2022-02-01 0:18 ` [PATCH v2 1/2] i2c: " Zev Weiss 2022-02-01 0:18 ` Zev Weiss 2022-02-01 0:18 ` Zev Weiss [this message] 2022-02-01 0:18 ` [PATCH v2 2/2] dt-bindings: i2c: add nxp, pca9541 release-delay-us property Zev Weiss 2022-02-09 21:47 ` [PATCH v2 2/2] dt-bindings: i2c: add nxp,pca9541 " Rob Herring 2022-02-09 21:47 ` Rob Herring 2022-02-28 8:43 ` [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support Zev Weiss 2022-02-28 8:43 ` Zev Weiss 2022-02-28 13:57 ` Guenter Roeck 2022-02-28 13:57 ` Guenter Roeck 2022-02-28 17:11 ` Zev Weiss 2022-02-28 17:11 ` Zev Weiss 2022-02-28 17:19 ` Wolfram Sang 2022-02-28 17:19 ` Wolfram Sang 2022-02-28 18:10 ` Guenter Roeck 2022-02-28 18:10 ` Guenter Roeck 2022-02-28 21:54 ` Peter Rosin 2022-02-28 21:54 ` Peter Rosin 2022-02-28 22:38 ` Zev Weiss 2022-02-28 22:38 ` Zev Weiss 2022-03-02 14:43 ` Peter Rosin 2022-03-02 14:43 ` Peter Rosin 2022-03-03 0:43 ` Zev Weiss 2022-03-03 0:43 ` Zev Weiss 2022-03-18 11:00 ` Wolfram Sang 2022-03-18 11:00 ` Wolfram Sang 2022-03-21 22:32 ` Zev Weiss
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20220201001810.19516-3-zev@bewilderbeest.net \ --to=zev@bewilderbeest.net \ --cc=devicetree@vger.kernel.org \ --cc=linux-i2c@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux@roeck-us.net \ --cc=openbmc@lists.ozlabs.org \ --cc=peda@axentia.se \ --cc=robh+dt@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.