From mboxrd@z Thu Jan 1 00:00:00 1970 From: aisheng.dong@nxp.com (Dong Aisheng) Date: Sun, 17 Jun 2018 20:49:48 +0800 Subject: [PATCH V2 3/4] dt-bindings: arm: fsl: add scu binding doc In-Reply-To: <1529239789-26849-1-git-send-email-aisheng.dong@nxp.com> References: <1529239789-26849-1-git-send-email-aisheng.dong@nxp.com> Message-ID: <1529239789-26849-4-git-send-email-aisheng.dong@nxp.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The System Controller Firmware (SCFW) is a low-level system function which runs on a dedicated Cortex-M core to provide power, clock, and resource management. It exists on some i.MX8 processors. e.g. i.MX8QM (QM, QP), and i.MX8QX (QXP, DX). Cc: Shawn Guo Cc: Sascha Hauer Cc: Fabio Estevam Cc: Rob Herring Cc: Mark Rutland Cc: devicetree at vger.kernel.org Signed-off-by: Dong Aisheng --- v1->v2: * remove status * changed to mu1 --- .../devicetree/bindings/arm/freescale/fsl,scu.txt | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt new file mode 100644 index 0000000..9b7c9fe --- /dev/null +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt @@ -0,0 +1,38 @@ +NXP i.MX System Controller Firmware (SCFW) +-------------------------------------------------------------------- + +The System Controller Firmware (SCFW) is a low-level system function +which runs on a dedicated Cortex-M core to provide power, clock, and +resource management. It exists on some i.MX8 processors. e.g. i.MX8QM +(QM, QP), and i.MX8QX (QXP, DX). + +The AP communicates with the SC using a multi-ported MU module found +in the LSIO subsystem. The current definition of this MU module provides +5 remote AP connections to the SC to support up to 5 execution environments +(TZ, HV, standard Linux, etc.). The SC side of this MU module interfaces +with the LSIO DSC IP bus. The SC firmware will communicate with this MU +using the MSI bus. + +System Controller Device Node: +============================= + +Required properties: +------------------- +- compatible: should be "fsl,imx8qxp-scu" or "fsl,imx8qm-scu" +- fsl,mu: a phandle to the Message Unit used by SCU. Should be + one of LSIO MU0~M4 for imx8qxp and imx8qm. Users need + to make sure not use the one which is conflict with + other execution environments. e.g. ATF. + +Examples: +-------- +lsio_mu1: mu at 5d1c0000 { + compatible = "fsl,imx8qxp-mu"; + reg = <0x0 0x5d1c0000 0x0 0x10000>; + interrupts = ; +}; + +scu { + compatible = "fsl,imx8qxp-scu"; + fsl,mu = <&lsio_mu1>; +}; -- 2.7.4