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Fri, 07 Feb 2020 10:08:36 +0000 MIME-Version: 1.0 Date: Fri, 07 Feb 2020 10:08:36 +0000 From: Marc Zyngier To: peng.fan@nxp.com Subject: Re: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports In-Reply-To: <1580994086-17850-2-git-send-email-peng.fan@nxp.com> References: <1580994086-17850-1-git-send-email-peng.fan@nxp.com> <1580994086-17850-2-git-send-email-peng.fan@nxp.com> Message-ID: <7875e2533c4ba23b8ca0a2a296699497@kernel.org> X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.8 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: peng.fan@nxp.com, sudeep.holla@arm.com, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, f.fainelli@gmail.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com, andre.przywara@arm.com, linux-arm-kernel@lists.infradead.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200207_020839_052219_C2083293 X-CRM114-Status: GOOD ( 16.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, f.fainelli@gmail.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, andre.przywara@arm.com, robh+dt@kernel.org, linux-imx@nxp.com, sudeep.holla@arm.com, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020-02-06 13:01, peng.fan@nxp.com wrote: > From: Peng Fan > > SCMI could use SMC/HVC as tranports, so add into devicetree > binding doc. > > Signed-off-by: Peng Fan > --- > Documentation/devicetree/bindings/arm/arm,scmi.txt | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt > b/Documentation/devicetree/bindings/arm/arm,scmi.txt > index f493d69e6194..03cff8b55a93 100644 > --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt > +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt > @@ -14,7 +14,7 @@ Required properties: > > The scmi node with the following properties shall be under the > /firmware/ node. > > -- compatible : shall be "arm,scmi" > +- compatible : shall be "arm,scmi" or "arm,scmi-smc" > - mboxes: List of phandle and mailbox channel specifiers. It should > contain > exactly one or two mailboxes, one for transmitting messages("tx") > and another optional for receiving the notifications("rx") if > @@ -25,6 +25,8 @@ The scmi node with the following properties shall be > under the /firmware/ node. > protocol identifier for a given sub-node. > - #size-cells : should be '0' as 'reg' property doesn't have any size > associated with it. > +- arm,smc-id : SMC id required when using smc transports > +- arm,hvc-id : HVC id required when using hvc transports > > Optional properties: Not directly related to DT: Why do we need to distinguish between SMC and HVC? Other SMC/HVC capable protocols are able to pick the right one based on the PSCI conduit. This is how the Spectre mitigations work already. Why is that any different? Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel