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[34.34.173.130]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436611ea387sm17436705e9.6.2024.12.19.05.07.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Dec 2024 05:07:52 -0800 (PST) From: Tudor Ambarus Date: Thu, 19 Dec 2024 13:07:46 +0000 Subject: [PATCH 1/2] dt-bindings: mailbox: add support for referencing controllers solely by node Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241219-mbox_request_channel_by_args-v1-1-617a6910f842@linaro.org> References: <20241219-mbox_request_channel_by_args-v1-0-617a6910f842@linaro.org> In-Reply-To: <20241219-mbox_request_channel_by_args-v1-0-617a6910f842@linaro.org> To: Jassi Brar , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, andre.draszik@linaro.org, peter.griffin@linaro.org, kernel-team@android.com, willmcvicker@google.com, daniel.lezcano@linaro.org, vincent.guittot@linaro.org, ulf.hansson@linaro.org, arnd@arndb.de, Tudor Ambarus X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1734613671; l=1946; i=tudor.ambarus@linaro.org; s=20241212; h=from:subject:message-id; bh=1yf/YbX5zzLVOPLgM9Mf3iD1fLxwVX2uCkX7LRhP57Y=; b=73v7sR57R4aQx/YJWHUxGp/CxrhVmSD74UnblBJ4DVkdsJAKq1xaT2O5VdZSGL1GGLJRbSanH 61XYqh9IhL6AXZvYy040Qec9Tor97M/d9bMF8JF4KqLS+B5w682WxlH X-Developer-Key: i=tudor.ambarus@linaro.org; a=ed25519; pk=uQzE0NXo3dIjeowMTOPCpIiPHEz12IA/MbyzrZVh9WI= There are mailbox clients that can discover the mailbox channel ID at run-time. For such cases passing the channel identifier via DT is redundant. Add support for referencing controllers solely by node. Signed-off-by: Tudor Ambarus --- Documentation/devicetree/bindings/mailbox/mailbox.txt | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/mailbox/mailbox.txt b/Documentation/devicetree/bindings/mailbox/mailbox.txt index af8ecee2ac68..0c4295a62f61 100644 --- a/Documentation/devicetree/bindings/mailbox/mailbox.txt +++ b/Documentation/devicetree/bindings/mailbox/mailbox.txt @@ -5,9 +5,10 @@ assign appropriate mailbox channel to client drivers. * Mailbox Controller -Required property: -- #mbox-cells: Must be at least 1. Number of cells in a mailbox - specifier. +Optional property: +- #mbox-cells: Must be at least 1. Number of cells in a mailbox specifier. + The property becomes mandatory for the cases where the clients + reference the controller via the mboxes property. Example: mailbox: mailbox { @@ -19,7 +20,11 @@ Example: * Mailbox Client Required property: +Clients must reference the mailbox controller either via the mboxes or mbox +properties. - mboxes: List of phandle and mailbox channel specifiers. +- mbox: phandle pointing to the controller. Used by clients that can discover + the channel identifiers at runtime. Optional property: - mbox-names: List of identifier strings for each mailbox channel. @@ -29,7 +34,13 @@ Optional property: communication between the mailbox client and the remote. -Example: +Example using mbox: + power-management { + ... + mbox = <&mailbox>; + }; + +Example using mboxes: pwr_cntrl: power { ... mbox-names = "pwr-ctrl", "rpc";