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mmc: sdhci-tegra: Add 8-bit support to device tree binding.

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The previous patch which implemented a DT binding for sdhci-tegra did not
allow all platform data fields to be initialized from DT. The following
were missing:

is_8bit: Implemented by this patch.

pm_flags: Not implemented yet. There are no mainline users of this field.
  I'm not quite sure what it's for, and hence how to represent this
  in DT; the value ends up being assigned to host->mmc->pm_caps.

While we're at it, fix the binding documentation to refer to "SD/MMC"
instead of "eSDHC", since that's the correct name; "eSDHC" was cut/paste
from the Freescale binding docs.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Stephen Warren 2011-08-30 13:17:16 -06:00 committed by Chris Ball
parent 1a5c8e1f4f
commit 55cd65e48b
2 changed files with 7 additions and 2 deletions
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6
Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
View file

@ -5,13 +5,14 @@ and SDIO types of memory cards.
Required properties:
- compatible : Should be "nvidia,<chip>-sdhci"
- reg : Should contain eSDHC registers location and length
- interrupts : Should contain eSDHC interrupt
- reg : Should contain SD/MMC registers location and length
- interrupts : Should contain SD/MMC interrupt
Optional properties:
- cd-gpios : Specify GPIOs for card detection
- wp-gpios : Specify GPIOs for write protection
- power-gpios : Specify GPIOs for power control
- support-8bit : Boolean, indicates if 8-bit mode should be used.
Example:
@ -22,4 +23,5 @@ sdhci@c8000200 {
cd-gpios = <&gpio 69 0>; /* gpio PI5 */
wp-gpios = <&gpio 57 0>; /* gpio PH1 */
power-gpios = <&gpio 155 0>; /* gpio PT3 */
support-8bit;
};

3
drivers/mmc/host/sdhci-tegra.c
View file

@ -17,6 +17,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
@ -152,6 +153,8 @@ static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
if (of_find_property(np, "support-8bit", NULL))
plat->is_8bit = 1;
return plat;
}