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ARM: OMAP2+: gpmc: add DT bindings for OneNAND

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This patch adds device tree bindings for OMAP OneNAND devices.
Tested on an OMAP3 3430 IGEPv2 board.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Ezequiel Garcia 2013-01-25 09:23:11 -03:00 committed by Tony Lindgren
parent faf5d2ff82
commit 75d3625e0e
2 changed files with 88 additions and 0 deletions
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43
Documentation/devicetree/bindings/mtd/gpmc-onenand.txt Normal file
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@ -0,0 +1,43 @@
Device tree bindings for GPMC connected OneNANDs
GPMC connected OneNAND (found on OMAP boards) are represented as child nodes of
the GPMC controller with a name of "onenand".
All timing relevant properties as well as generic gpmc child properties are
explained in a separate documents - please refer to
Documentation/devicetree/bindings/bus/ti-gpmc.txt
Required properties:
- reg: The CS line the peripheral is connected to
Optional properties:
- dma-channel: DMA Channel index
For inline partiton table parsing (optional):
- #address-cells: should be set to 1
- #size-cells: should be set to 1
Example for an OMAP3430 board:
gpmc: gpmc@6e000000 {
compatible = "ti,omap3430-gpmc";
ti,hwmods = "gpmc";
reg = <0x6e000000 0x1000000>;
interrupts = <20>;
gpmc,num-cs = <8>;
gpmc,num-waitpins = <4>;
#address-cells = <2>;
#size-cells = <1>;
onenand@0 {
reg = <0 0 0>; /* CS0, offset 0 */
#address-cells = <1>;
#size-cells = <1>;
/* partitions go here */
};
};

45
arch/arm/mach-omap2/gpmc.c
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@ -39,6 +39,7 @@
#include "omap_device.h"
#include "gpmc.h"
#include "gpmc-nand.h"
#include "gpmc-onenand.h"
#define DEVICE_NAME "omap-gpmc"
@ -1263,6 +1264,43 @@ static int gpmc_probe_nand_child(struct platform_device *pdev,
}
#endif
#ifdef CONFIG_MTD_ONENAND
static int gpmc_probe_onenand_child(struct platform_device *pdev,
struct device_node *child)
{
u32 val;
struct omap_onenand_platform_data *gpmc_onenand_data;
if (of_property_read_u32(child, "reg", &val) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
child->full_name);
return -ENODEV;
}
gpmc_onenand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_onenand_data),
GFP_KERNEL);
if (!gpmc_onenand_data)
return -ENOMEM;
gpmc_onenand_data->cs = val;
gpmc_onenand_data->of_node = child;
gpmc_onenand_data->dma_channel = -1;
if (!of_property_read_u32(child, "dma-channel", &val))
gpmc_onenand_data->dma_channel = val;
gpmc_onenand_init(gpmc_onenand_data);
return 0;
}
#else
static int gpmc_probe_onenand_child(struct platform_device *pdev,
struct device_node *child)
{
return 0;
}
#endif
static int gpmc_probe_dt(struct platform_device *pdev)
{
int ret;
@ -1281,6 +1319,13 @@ static int gpmc_probe_dt(struct platform_device *pdev)
}
}
for_each_node_by_name(child, "onenand") {
ret = gpmc_probe_onenand_child(pdev, child);
if (ret < 0) {
of_node_put(child);
return ret;
}
}
return 0;
}
#else