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bh=2eptaMvxu/Yjv7wstKV5wbLlhTQnULNRTprcgCrZVTA=; b=CF98u+FtarUT1f2SKhpil2NtWEK/SW5N+0g7Qz1lVvRCcCFni3rKaHdNIIJIZG4N4y v7HCti7AOLHJvC3Htf4WO+1kpOc4w3z6G6Bh00gDWltXZAZ1a5/0VNelRqtgMTnrE7Bl 9a70ZGkbZUXSXdQamiC439KOKyezgso+XUEVnvGvk50DCv7dtVadeCcCrL6uVxuei3If l/sZsAx9wC1SBHF4Dxjv/hSa/cjCsvLEMFgSKMj0BF3WBeTutRvHrj0WXelh2ACQ+iQQ K3IwVU+75+EHoEOthl5OxWfujGAfNUHxf1/6iVML7/pENm5imHGFhiSi1kYVt0h+H2TA L8LQ== X-Gm-Message-State: AHQUAuYgBYz6ZgEdFlG5o85FJ+2emNAreD05oU8CxJmZltQVEQOSzX45 SErJpUpRvqGUvhSzxO+I5Li2qvDlFijp X-Google-Smtp-Source: AHgI3IanU/eCFiw7CWFWFrcfmEO6ShyPi8W35xztC/xt6XZCMHYRktRiMC6jXoX5SV873BIJlyKQ9RdJUIiG X-Received: by 2002:a24:5e94:: with SMTP id h142mr103861itb.35.1551286730735; Wed, 27 Feb 2019 08:58:50 -0800 (PST) Date: Wed, 27 Feb 2019 08:58:41 -0800 Message-Id: <20190227165841.143802-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.rc2.261.ga7da99ff1b-goog Subject: [PATCH v4 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-20190227_085852_824025_52391E09 X-CRM114-Status: GOOD ( 13.20 ) 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 v4: - None Changes for v3: - None Changes for v2: - Added comment about syscon required parameter. --- .../bindings/misc/aspeed-p2a-ctrl.txt | 32 +++++++++++++++++++ 1 file changed, 32 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 000000000000..1092d62d1c92 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt @@ -0,0 +1,32 @@ +====================================================================== +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 + +Example: + +p2a: p2a-control@1e6e2000 { + compatible = "aspeed,ast2400-p2a-ctrl"; + memory-region = <&reserved_memory>; + syscon = <&syscon>; +};