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Thu, 19 Dec 2024 07:42:12 -0800 (PST) Message-ID: Date: Thu, 19 Dec 2024 15:42:11 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: mailbox: add support for referencing controllers solely by node To: Conor Dooley Cc: Jassi Brar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , 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 References: <20241219-mbox_request_channel_by_args-v1-0-617a6910f842@linaro.org> <20241219-mbox_request_channel_by_args-v1-1-617a6910f842@linaro.org> <20241219-recent-everyone-865b19864693@wendy> Content-Language: en-US From: Tudor Ambarus In-Reply-To: <20241219-recent-everyone-865b19864693@wendy> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, Conor, On 12/19/24 2:11 PM, Conor Dooley wrote: >> 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. > I don't really get your implementation, why not just allow #mbox-cells = 0? > That's what's done for things like fixed frequency clocks that only have > a single output. Ah, indeed! instead of: of_parse_phandle(dev->of_node, "mbox", 0); I can do a: of_parse_phandle_with_args(dev->of_node, "mboxes", "#mbox-cells", 0, &of_args) where #mbox-cells = 0; Or ... can I pass NULL for cells_name and make the #mbox-cells property optional and still keeping its requirement of being at least 1? Thanks! ta