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mmc: omap_hsmmc: Convert hsmmc driver to use device tree

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Define dt bindings for the ti-omap-hsmmc, and adapt the driver to extract
data (which was earlier passed as platform_data) from device tree.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Rajendra Nayak 2012-03-12 20:32:37 +05:30 committed by Chris Ball
parent f3c55a7b5d
commit 46856a68dc
2 changed files with 106 additions and 0 deletions
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33
Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt Normal file
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@ -0,0 +1,33 @@
* TI Highspeed MMC host controller for OMAP
The Highspeed MMC Host Controller on TI OMAP family
provides an interface for MMC, SD, and SDIO types of memory cards.
Required properties:
- compatible:
Should be "ti,omap2-hsmmc", for OMAP2 controllers
Should be "ti,omap3-hsmmc", for OMAP3 controllers
Should be "ti,omap4-hsmmc", for OMAP4 controllers
- ti,hwmods: Must be "mmc<n>", n is controller instance starting 1
- reg : should contain hsmmc registers location and length
Optional properties:
ti,dual-volt: boolean, supports dual voltage cards
<supply-name>-supply: phandle to the regulator device tree node
"supply-name" examples are "vmmc", "vmmc_aux" etc
ti,bus-width: Number of data lines, default assumed is 1 if the property is missing.
cd-gpios: GPIOs for card detection
wp-gpios: GPIOs for write protection
ti,non-removable: non-removable slot (like eMMC)
ti,needs-special-reset: Requires a special softreset sequence
Example:
mmc1: mmc@0x4809c000 {
compatible = "ti,omap4-hsmmc";
reg = <0x4809c000 0x400>;
ti,hwmods = "mmc1";
ti,dual-volt;
ti,bus-width = <4>;
vmmc-supply = <&vmmc>; /* phandle to regulator node */
ti,non-removable;
};

73
drivers/mmc/host/omap_hsmmc.c
View File

@ -26,6 +26,9 @@
#include <linux/platform_device.h>
#include <linux/timer.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/mmc/host.h>
#include <linux/mmc/core.h>
#include <linux/mmc/mmc.h>
@ -1710,6 +1713,65 @@ static void omap_hsmmc_debugfs(struct mmc_host *mmc)
#endif
#ifdef CONFIG_OF
static u16 omap4_reg_offset = 0x100;
static const struct of_device_id omap_mmc_of_match[] = {
{
.compatible = "ti,omap2-hsmmc",
},
{
.compatible = "ti,omap3-hsmmc",
},
{
.compatible = "ti,omap4-hsmmc",
.data = &omap4_reg_offset,
},
{},
}
MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
{
struct omap_mmc_platform_data *pdata;
struct device_node *np = dev->of_node;
u32 bus_width;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL; /* out of memory */
if (of_find_property(np, "ti,dual-volt", NULL))
pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
/* This driver only supports 1 slot */
pdata->nr_slots = 1;
pdata->slots[0].switch_pin = of_get_named_gpio(np, "cd-gpios", 0);
pdata->slots[0].gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
if (of_find_property(np, "ti,non-removable", NULL)) {
pdata->slots[0].nonremovable = true;
pdata->slots[0].no_regulator_off_init = true;
}
of_property_read_u32(np, "ti,bus-width", &bus_width);
if (bus_width == 4)
pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
else if (bus_width == 8)
pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
if (of_find_property(np, "ti,needs-special-reset", NULL))
pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
return pdata;
}
#else
static inline struct omap_mmc_platform_data
*of_get_hsmmc_pdata(struct device *dev)
{
return NULL;
}
#endif
static int __init omap_hsmmc_probe(struct platform_device *pdev)
{
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
@ -1717,6 +1779,16 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
struct omap_hsmmc_host *host = NULL;
struct resource *res;
int ret, irq;
const struct of_device_id *match;
match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
if (match) {
pdata = of_get_hsmmc_pdata(&pdev->dev);
if (match->data) {
u16 *offsetp = match->data;
pdata->reg_offset = *offsetp;
}
}
if (pdata == NULL) {
dev_err(&pdev->dev, "Platform Data is missing\n");
@ -2122,6 +2194,7 @@ static struct platform_driver omap_hsmmc_driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.pm = &omap_hsmmc_dev_pm_ops,
.of_match_table = of_match_ptr(omap_mmc_of_match),
},
};