From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Date: Fri, 22 Jun 2018 14:37:55 +1000 Subject: [PATCH 1/2] dt-bindings: fsi: Add optional chip-id to CFAMs Message-ID: <20180622043756.21158-1-benh@kernel.crashing.org> List-Id: To: linux-aspeed@lists.ozlabs.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit This represents a physical chip in the system and allows a stable numbering scheme to be passed to udev for userspace to recognize which chip is which. Signed-off-by: Benjamin Herrenschmidt --- Documentation/devicetree/bindings/fsi/fsi.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/fsi/fsi.txt b/Documentation/devicetree/bindings/fsi/fsi.txt index ab516c673a4b..afb4eccab131 100644 --- a/Documentation/devicetree/bindings/fsi/fsi.txt +++ b/Documentation/devicetree/bindings/fsi/fsi.txt @@ -83,6 +83,10 @@ addresses and sizes in the slave address space: #address-cells = <1>; #size-cells = <1>; +Optionally, a slave can provide a global unique chip ID which is used to +identify the physical location of the chip in a system specific way + + chip-id = <0>; FSI engines (devices) --------------------- @@ -125,6 +129,7 @@ device tree if no extra platform information is required. reg = <0 0>; #address-cells = <1>; #size-cells = <1>; + chip-id = <0>; /* FSI engine at 0xc00, using a single page. In this example, * it's an I2C master controller, so subnodes describe the -- 2.17.1