linux-kernel - [PATCH v2 23/34] ARM: tegra: apalis

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Date:   Fri, 31 Aug 2018 18:38:05 +0200
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 23/34] ARM: tegra: apalis_t30: enable emmc ddr52 mode

From: Marcel Ziswiler <marcel.ziswiler@...adex.com>

Add mmc-ddr-1_8v property enabling eMMC DDR52 mode.

root@...lis-t30:~# cat /sys/kernel/debug/mmc1/ios
clock:          52000000 Hz
actual clock:   52000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    8 (mmc DDR52)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)
root@...lis-t30:~# hdparm -t /dev/mmcblk1

/dev/mmcblk1:
 Timing buffered disk reads: 232 MB in  3.01 seconds =  77.10 MB/sec

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>

---

Changes in v2: None

 arch/arm/boot/dts/tegra30-apalis.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/tegra30-apalis.dtsi b/arch/arm/boot/dts/tegra30-apalis.dtsi
index 2e2cdd454fe3..6d6f17422478 100644
--- a/arch/arm/boot/dts/tegra30-apalis.dtsi
+++ b/arch/arm/boot/dts/tegra30-apalis.dtsi
@@ -1094,6 +1094,7 @@
 		non-removable;
 		vmmc-supply = <&reg_module_3v3>; /* VCC */
 		vqmmc-supply = <&reg_1v8_vio>; /* VCCQ */
+		mmc-ddr-1_8v;
 	};
 
 	clocks {
-- 
2.14.4