linux-kernel - [PATCH] arm64: dts: hikey: Enable HS200 mode on eMMC

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Date:   Wed, 17 Jan 2018 14:35:30 -0600
From:   oscardagrach <ryan@...ted.us>
To:     unlisted-recipients:; (no To-header on input)
Cc:     oscardagrach <ryan@...ted.us>, Wei Xu <xuwei5@...ilicon.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: hikey: Enable HS200 mode on eMMC

According to the hi6220 datasheet, the MMC controller is JEDEC eMMC 4.5
compliant, in addition to supporting a clock of up to 150MHz. The Hikey
schematic also indicates the device utilizes 1.8v signaling. Define these
parameters in the device tree to enable HS200 mode.

Signed-off-by: Ryan Grachek <ryan@...ted.us>
---
 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
index 3aee6123d161..964e43e05ac6 100644
--- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
+++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
@@ -299,7 +299,9 @@
 		/* GPIO blocks 16 thru 19 do not appear to be routed to pins */
 
 		dwmmc_0: dwmmc0@...3d000 {
+			max-frequency = <150000000>;
 			cap-mmc-highspeed;
+			mmc-hs200-1_8v;
 			non-removable;
 			bus-width = <0x8>;
 			vmmc-supply = <&ldo19>;
-- 
2.11.0