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bh=b5YLUBhVLY7mkfopkFQjIkzP3Gwv/ZY13l4EfD4a/cA=; b=kE+CBconqeysWWiT+4E9XZNQpdoCNUQAwC2/QBfmXu3rVO0tAv0/g+AedtnpkgeoaZ 4HX0IvVbMoMFpMvaYc2bj/2WSgGpdWlrVsJYxUXtdSKTM8pgPWrCbBCoifC5TZ39upAe OE7l+rESMhEwcm8t23sGrbIzB8dMwZjN0I0FzNCTdgEAj/jVHUp3sr7vcSHpdLTjdqXx AUuAw96Di4oQsHRv4ucDdwLOBpU45ZGIMlv5YKr1jKufSx+OgJhVTDNg/paXoJ9qEg61 kayCodUeNl+6yM2ZTNcC3pBIn7U/aIGsKJHDNgS1l2iu8EtQTLlRJFa2U4tlPop+TRrR FwMA== X-Gm-Message-State: APjAAAW7Vy2I8fu4C2J5fH9+cpoBhiag2rjAKVOTliDT3BtRYczob/pD XgZlRx/hfEYnzbfYKROjY0oz2pe6OxY2 X-Google-Smtp-Source: APXvYqx8DIwao7Qeicx77irHcsITaRHETyMc24ZgVrUbqrPzxKZF5aW+yMwNH21N6DXctR0ATjDV0ngcwmzI X-Received: by 2002:ac8:93d:: with SMTP id t58mr3643003qth.41.1554734544323; Mon, 08 Apr 2019 07:42:24 -0700 (PDT) Date: Mon, 8 Apr 2019 07:42:16 -0700 Message-Id: <20190408144216.160082-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v10 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-20190408_074226_762510_D0DDC9E9 X-CRM114-Status: GOOD ( 13.27 ) 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: Rob Herring , 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 Reviewed-by: Rob Herring Reviewed-by: Andrew Jeffery --- Changes for v10: - Chopped out nearly identical information. Changes for v9: - Added missing details about syscon parent 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 | 47 +++++++++++++++++++ 1 file changed, 47 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..854bd67ffec68 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt @@ -0,0 +1,47 @@ +====================================================================== +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" + +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>; + }; +};