Commit 75d3625e authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Tony Lindgren
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ARM: OMAP2+: gpmc: add DT bindings for OneNAND 



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

Signed-off-by: default avatarEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent faf5d2ff

Documentation/devicetree/bindings/mtd/gpmc-onenand.txt

0 → 100644
+43 −0
Original line number Diff line number Diff line 
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 */

		};

	};

arch/arm/mach-omap2/gpmc.c

+45 −0
Original line number Diff line number Diff line
@@ -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