linux-kernel - [PATCHv4 3/6] ARM: dts: exynos: update maximum frequency for sdcard to 200MHz

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Message-Id: <20180922075238.884-5-linux.amoon@gmail.com>
Date:   Sat, 22 Sep 2018 07:52:35 +0000
From:   Anand Moon <linux.amoon@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org
Subject: [PATCHv4 3/6] ARM: dts: exynos: update maximum frequency for sdcard to 200MHz

set the max-frequency to 200MHz for optimal performace.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
This patch is new to this series.

microSD card.
root@...oid:~# sudo cat /sys/kernel/debug/mmc1/ios
clock:          200000000 Hz
actual clock:   200000000 Hz
vdd:            16 (2.8 ~ 2.9 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    6 (sd uhs SDR104)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)
---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
index 15ab380e5fcf..a80b6c045154 100644
--- a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
@@ -501,6 +501,7 @@
 	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus1 &sd2_bus4>;
 	bus-width = <4>;
 	cap-sd-highspeed;
+	max-frequency = <200000000>;
 	vmmc-supply = <&ldo19_reg>;
 	vqmmc-supply = <&ldo13_reg>;
 	sd-uhs-sdr50;
-- 
2.17.1