From mboxrd@z Thu Jan 1 00:00:00 1970 From: zajec5@gmail.com (=?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?=) Date: Thu, 8 Jun 2017 22:04:27 +0200 Subject: [PATCH V2 4/5] dt-bindings: phy: Modify Broadcom NS USB 3.0 PHY binding to use MDIO In-Reply-To: <20170608200428.9187-1-zajec5@gmail.com> References: <20170511132925.14564-1-zajec5@gmail.com> <20170608200428.9187-1-zajec5@gmail.com> Message-ID: <20170608200428.9187-5-zajec5@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Rafa? Mi?ecki Thanks to work done by Broadcom explaining their USB 3.0 PHY details we know it's attached to the MDIO bus. Use this knowledge to update the binding: make it a subnode to the MDIO bus and rework way of specifying required registers. This will describe hardware more precisely and will allow to support (describe) more devices attached to the MDIO. While compatibility strings remain the same there isn't a direct conflict (compatibility breakage) for the binding. Originally it wasn't supposed to be used for MDIO subnode so this change should be safe unless some operating system was probing MDIO subnodes as standalone devices. Signed-off-by: Rafa? Mi?ecki --- V2: Extend commit message to better describe reason and includ info on (non-)breakage. --- .../devicetree/bindings/phy/bcm-ns-usb3-phy.txt | 27 +++++++++++++++------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt index 09aeba94538d..32f057260351 100644 --- a/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt +++ b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt @@ -3,9 +3,10 @@ Driver for Broadcom Northstar USB 3.0 PHY Required properties: - compatible: one of: "brcm,ns-ax-usb3-phy", "brcm,ns-bx-usb3-phy". -- reg: register mappings for DMP (Device Management Plugin) and ChipCommon B - MMI. -- reg-names: "dmp" and "ccb-mii" +- reg: address of MDIO bus device +- usb3-dmp-syscon: phandle to syscon with DMP (Device Management Plugin) + registers +- #phy-cells: must be 0 Initialization of USB 3.0 PHY depends on Northstar version. There are currently three known series: Ax, Bx and Cx. @@ -15,9 +16,19 @@ Known B1: BCM4707 rev 6 Known C0: BCM47094 rev 0 Example: - usb3-phy { - compatible = "brcm,ns-ax-usb3-phy"; - reg = <0x18105000 0x1000>, <0x18003000 0x1000>; - reg-names = "dmp", "ccb-mii"; - #phy-cells = <0>; + mdio: mdio at 0 { + reg = <0x0>; + #size-cells = <1>; + #address-cells = <0>; + + usb3-phy at 10 { + compatible = "brcm,ns-ax-usb3-phy"; + reg = <0x10>; + usb3-dmp-syscon = <&usb3_dmp>; + #phy-cells = <0>; + }; + }; + + usb3_dmp: syscon at 18105000 { + reg = <0x18105000 0x1000>; }; -- 2.11.0