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From:   Marcel Ziswiler <marcel@ziswiler.com>
To:     devicetree@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH v2 23/34] ARM: tegra: apalis_t30: enable emmc ddr52 mode
Date:   Fri, 31 Aug 2018 18:38:05 +0200
Message-Id: <20180831163817.23970-24-marcel@ziswiler.com>
In-Reply-To: <20180831163817.23970-1-marcel@ziswiler.com>
References: <20180831163817.23970-1-marcel@ziswiler.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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

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

root@apalis-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@apalis-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@toradex.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