linux-kernel - [PATCH 33/41] ARM: dts: dra7: Add "max-frequency" property to MMC dt nodes

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Date:   Fri, 19 May 2017 13:45:33 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jonathan Corbet <corbet@....net>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>, <nsekhar@...com>,
        <kishon@...com>
Subject: [PATCH 33/41] ARM: dts: dra7: Add "max-frequency" property to MMC dt nodes

Add "max-frequency" property to MMC dt nodes and set the
maximum frequency to 192MHz for MMC1/MMC2, 64MHz for MMC3
and 192MHz for MMC4. pdata quirks must be utilized to
detect presence of rev 1.1/1.0 of silicon and adjust
maximum frequencies as per restrictions documented in i843.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 arch/arm/boot/dts/dra7.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index 5a262e1a0313..38fb1828e26a 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -1045,6 +1045,7 @@
 			dma-names = "tx", "rx";
 			status = "disabled";
 			pbias-supply = <&pbias_mmc_reg>;
+			max-frequency = <192000000>;
 		};
 
 		mmc2: mmc@...b4000 {
@@ -1056,6 +1057,7 @@
 			dmas = <&sdma_xbar 47>, <&sdma_xbar 48>;
 			dma-names = "tx", "rx";
 			status = "disabled";
+			max-frequency = <192000000>;
 		};
 
 		mmc3: mmc@...ad000 {
@@ -1067,6 +1069,8 @@
 			dmas = <&sdma_xbar 77>, <&sdma_xbar 78>;
 			dma-names = "tx", "rx";
 			status = "disabled";
+			/* Errata i887 limits max-frequency of MMC3 to 64 MHz */
+			max-frequency = <64000000>;
 		};
 
 		mmc4: mmc@...d1000 {
@@ -1078,6 +1082,7 @@
 			dmas = <&sdma_xbar 57>, <&sdma_xbar 58>;
 			dma-names = "tx", "rx";
 			status = "disabled";
+			max-frequency = <192000000>;
 		};
 
 		mmu0_dsp1: mmu@...01000 {
-- 
2.11.0