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bh=48scp4XmiicMd1uJB9R9oC5WIEZgJYNMZkP6/YkFhCc=; b=HFhiRzUJ6ei419e3kGS7mDOna6w9DWWsUdN/d8FKbTICSRJyY5Cn8/7+HBeAXmqcKD 343cGKgdWIhl6Q+womttPT35vNjMEkbVH0pR9k3AbmRDV9lsyKrvTVtrvhoDfI4w2wQU 1+YxB5ka4DWSIFJ/0z8zbYaWHgHY2YSNS6eR1VCZdJBnqIHPlVBVhPOWNiRbF4DNbW7G 8SYZSqRi4AIVT+WpH+8mUngIoAtdI9YEjNBDjpf3vWK0QETEzosUyrkkEbuoZWDlMBI7 QMW1UTgPuL4zjm7cKnm/Avd4t5pN86QBRX/10I4FhUZGSJPT3MpThJrbEElp75DHeZHO D/FQ== X-Gm-Message-State: APjAAAWZxXliOzqQ0ewCHtIXetmbGH7oekKRYxloUsnLZLTdXxOoSO/J qH1ep0d1T7JE2KmjLH1dYrbZZodAspOe X-Google-Smtp-Source: APXvYqwu0UXYWUO2Au194kl9CxcUr6cu8AT+tKYOIEQUMOHJprFLKJq9sEDQmpHMlwoJ3w1etKSm7myJKCHi X-Received: by 2002:aed:3e16:: with SMTP id l22mr1962071qtf.50.1553721724234; Wed, 27 Mar 2019 14:22:04 -0700 (PDT) Date: Wed, 27 Mar 2019 14:21:55 -0700 Message-Id: <20190327212155.80730-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v8 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support From: Patrick Venture To: venture@google.com, robh+dt@kernel.org, mark.rutland@arm.com, joel@jms.id.au, andrew@aj.id.au, gregkh@linuxfoundation.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190327_142208_021045_87955721 X-CRM114-Status: GOOD ( 13.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Document the ast2400, ast2500 PCI-to-AHB bridge control driver bindings. Signed-off-by: Patrick Venture --- Changes for v8: - None Changes for v7: - Moved node under the syscon node it requires Changes for v6: - None Changes for v5: - None Changes for v4: - None Changes for v3: - None Changes for v2: - Added comment about syscon required parameter. --- .../bindings/misc/aspeed-p2a-ctrl.txt | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt diff --git a/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt new file mode 100644 index 0000000000000..088cc4e3dc54b --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt @@ -0,0 +1,48 @@ +====================================================================== +Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver +====================================================================== + +The bridge is available on platforms with the VGA enabled on the Aspeed device. +In this case, the host has access to a 64KiB window into all of the BMC's +memory. The BMC can disable this bridge. If the bridge is enabled, the host +has read access to all the regions of memory, however the host only has read +and write access depending on a register controlled by the BMC. + +Required properties: +=================== + + - compatible: must be one of: + - "aspeed,ast2400-p2a-ctrl" + - "aspeed,ast2500-p2a-ctrl" + + - syscon: handle to syscon device node controlling PCI. + +Optional properties: +=================== + +- memory-region: A phandle to a reserved_memory region to be used for the PCI + to AHB mapping + +The p2a-control node should be the child of a syscon node with the required +property: + +- compatible : Should be one of the following: + "aspeed,ast2400-scu", "syscon", "simple-mfd" + "aspeed,g4-scu", "syscon", "simple-mfd" + "aspeed,ast2500-scu", "syscon", "simple-mfd" + "aspeed,g5-scu", "syscon", "simple-mfd" + +Example: + +g4 Example +---------- + +syscon: scu@1e6e2000 { + compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd"; + reg = <0x1e6e2000 0x1a8>; + + p2a: p2a-control { + compatible = "aspeed,ast2400-p2a-ctrl"; + memory-region = <&reserved_memory>; + }; +};