linux-kernel - [PATCH] mmc: dt: add host-off-card-on dt property

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Message-ID: <1373534129-9017-1-git-send-email-wni@nvidia.com>
Date:	Thu, 11 Jul 2013 17:15:29 +0800
From:	Wei Ni <wni@...dia.com>
To:	<grant.likely@...aro.org>, <rob@...dley.net>,
	<rob.herring@...xeda.com>, <cjb@...top.org>
CC:	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, Wei Ni <wni@...dia.com>
Subject: [PATCH] mmc: dt: add host-off-card-on dt property

Add "host-off-card-on" dt property and parse it to support the
quirk SDHCI_QUIRK2_HOST_OFF_CARD_ON.

Signed-off-by: Wei Ni <wni@...dia.com>
---
 Documentation/devicetree/bindings/mmc/mmc.txt |    2 ++
 drivers/mmc/host/sdhci-pltfm.c                |    3 +++
 2 files changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 85aada2..95ebe3e 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -28,6 +28,8 @@ Optional properties:
 - cap-mmc-highspeed: MMC high-speed timing is supported
 - cap-power-off-card: powering off the card is safe
 - cap-sdio-irq: enable SDIO IRQ signalling on this interface
+- host-off-card-on: when resume, denote that card keeps power
+  but host controller does not, so that it will reset sdhci all.
 
 *NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line
 polarity properties, we have to fix the meaning of the "normal" and "inverted"
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index cd0f1f6..b3730cc 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -89,6 +89,9 @@ void sdhci_get_of_property(struct platform_device *pdev)
 		if (of_get_property(np, "no-1-8-v", NULL))
 			host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 
+		if (of_get_property(np, "host-off-card-on", NULL))
+			host->quirks2 |= SDHCI_QUIRK2_HOST_OFF_CARD_ON;
+
 		if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
 			host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 
-- 
1.7.9.5

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