linux-kernel - [PATCH v3 1/2] dt-bindings: mmc: xenon: add AC5 compatible string

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Message-Id: <20220315220549.2749328-2-chris.packham@alliedtelesis.co.nz>
Date:   Wed, 16 Mar 2022 11:05:48 +1300
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     huziji@...vell.com, ulf.hansson@...aro.org, robh+dt@...nel.org,
        adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH v3 1/2] dt-bindings: mmc: xenon: add AC5 compatible string

Import binding documentation from the Marvell SDK which adds
marvell,ac5-sdhci compatible string and documents the requirements for
the for the Xenon SDHCI controller on the 98DX2530.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---

Notes:
    Changes in v3:
    - Split from larger series
    - Add review from Andrew
    Changes in v2:
    - New

 .../bindings/mmc/marvell,xenon-sdhci.txt      | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
index c51a62d751dc..43df466f0cb3 100644
--- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
@@ -14,6 +14,7 @@ Required Properties:
   - "marvell,armada-ap806-sdhci": For controllers on Armada AP806.
   - "marvell,armada-ap807-sdhci": For controllers on Armada AP807.
   - "marvell,armada-cp110-sdhci": For controllers on Armada CP110.
+  - "marvell,ac5-sdhci": For CnM on AC5, AC5X and derived.
 
 - clocks:
   Array of clocks required for SDHC.
@@ -33,6 +34,13 @@ Required Properties:
     in below.
     Please also check property marvell,pad-type in below.
 
+  * For "marvell,ac5-sdhci", one or two register areas.
+    (reg-names "ctrl" & "decoder").
+    The first one is mandatory for the Xenon IP registers.
+    The second one is for systems where DMA mapping is required and is the
+    related address decoder register (the value to configure is derived from
+    the parent "dma-ranges").
+
   * For other compatible strings, one register area for Xenon IP.
 
 Optional Properties:
@@ -171,3 +179,47 @@ Example:
 
 		marvell,pad-type = "sd";
 	};
+
+
+- For eMMC with compatible "marvell,ac5-sdhci" with one reg range (no dma):
+	sdhci0: sdhci@...c0000 {
+		compatible = "marvell,ac5-sdhci";
+		reg = <0x0 0x805c0000 0x0 0x300>;
+		reg-names = "ctrl", "decoder";
+		interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&core_clock>;
+		clock-names = "core";
+		status = "okay";
+		bus-width = <8>;
+		/*marvell,xenon-phy-slow-mode;*/
+		non-removable;
+		mmc-ddr-1_8v;
+		mmc-hs200-1_8v;
+		mmc-hs400-1_8v;
+	};
+
+- For eMMC with compatible "marvell,ac5-sdhci" with two reg ranges (with dma):
+	mmc_dma: mmc-dma-peripherals@...00000 {
+		compatible = "simple-bus";
+		#address-cells = <0x2>;
+		#size-cells = <0x2>;
+		ranges;
+		dma-ranges = <0x2 0x0 0x2 0x80000000 0x1 0x0>;
+		dma-coherent;
+
+		sdhci0: sdhci@...c0000 {
+			compatible = "marvell,ac5-sdhci", "marvell,armada-ap806-sdhci";
+			reg = <0x0 0x805c0000 0x0 0x300>, <0x0 0x80440230 0x0 0x4>;
+			reg-names = "ctrl", "decoder";
+			interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&core_clock>;
+			clock-names = "core";
+			status = "okay";
+			bus-width = <8>;
+			/*marvell,xenon-phy-slow-mode;*/
+			non-removable;
+			mmc-ddr-1_8v;
+			mmc-hs200-1_8v;
+			mmc-hs400-1_8v;
+		};
+	};
-- 
2.35.1