linux-kernel - [PATCH v3 1/2] dt-bindings: exynos-dw-mshc-common: add exynos78xx variants

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Date:   Sun, 12 Mar 2023 16:03:15 +0300
From:   Sergey Lisov <sleirsgoevy@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] dt-bindings: exynos-dw-mshc-common: add exynos78xx
 variants

Some Samsung Exynos boards using the arm64 architecture have DW MMC
controllers configured for a 32-bit data bus but a 64-bit FIFO. On these
systems the 64-bit FIFO registers must be accessed in two 32-bit halves.

Add two new compatible strings, "samsung,exynos78xx-dw-mshc" and
"samsung,exynos78xx-dw-mshc-smu" respectively, to denote exynos78xx
boards that need this quirk. But it's very possible that all
"samsung,exynos7-dw-mshc" boards are actually affected.
---
 .../devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml         | 2 ++
 arch/arm64/boot/dts/exynos/exynos7885.dtsi                      | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml b/Documentation/devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml
index fdaa18481..a72a67792 100644
--- a/Documentation/devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml
+++ b/Documentation/devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml
@@ -22,6 +22,8 @@ properties:
       - samsung,exynos5420-dw-mshc-smu
       - samsung,exynos7-dw-mshc
       - samsung,exynos7-dw-mshc-smu
+      - samsung,exynos78xx-dw-mshc
+      - samsung,exynos78xx-dw-mshc-smu
       - axis,artpec8-dw-mshc
 
   reg:
diff --git a/arch/arm64/boot/dts/exynos/exynos7885.dtsi b/arch/arm64/boot/dts/exynos/exynos7885.dtsi
index 23c2e0bb0..4b94ac9da 100644
--- a/arch/arm64/boot/dts/exynos/exynos7885.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos7885.dtsi
@@ -294,7 +294,7 @@ pmu_system_controller: system-controller@...80000 {
 		};
 
 		mmc_0: mmc@...00000 {
-			compatible = "samsung,exynos7-dw-mshc-smu";
+			compatible = "samsung,exynos78xx-dw-mshc-smu";
 			reg = <0x13500000 0x2000>;
 			interrupts = <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>;
 			#address-cells = <1>;
-- 
2.38.3