Patchwork [5/6,V2] atmel/nand: add DT support

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Submitter Jean-Christophe PLAGNIOL-VILLARD
Date Feb. 6, 2012, 10:35 a.m.
Message ID <1328524512-18159-2-git-send-email-plagnioj@jcrosoft.com>
Download mbox | patch
Permalink /patch/139708/
State New
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Comments

Jean-Christophe PLAGNIOL-VILLARD - Feb. 6, 2012, 10:35 a.m.
use a local copy of board informatin and fill with DT data

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-mtd@lists.infradead.org
---
V2:
	comment from Grant
	rebase over rc3

Best Regards,
J.
 .../devicetree/bindings/mtd/atmel-nand.txt         |   41 ++++++++
 drivers/mtd/nand/atmel_nand.c                      |  105 ++++++++++++++++----
 2 files changed, 126 insertions(+), 20 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/atmel-nand.txt
Nicolas Ferre - Feb. 7, 2012, 10:30 a.m.
On 02/06/2012 11:35 AM, Jean-Christophe PLAGNIOL-VILLARD :
> use a local copy of board informatin and fill with DT data
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: devicetree-discuss@lists.ozlabs.org
> Cc: linux-mtd@lists.infradead.org

[..]

> +static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
> +					 struct device_node *np)

Maybe you will need to protect this function in case of !DT builds: I
suspect that some of the of_xxxxx() calls are not provided if !CONFIG_OF.

> +{
> +	u32 val;
> +	int ecc_mode;
> +	struct atmel_nand_data *board = &host->board;
> +	enum of_gpio_flags flags;
> +
> +	if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
> +		if (val >= 32) {
> +			dev_err(host->dev, "invalid addr-offset %u\n", val);
> +			return -EINVAL;
> +		}
> +		board->ale = val;
> +	}
> +
> +	if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
> +		if (val >= 32) {
> +			dev_err(host->dev, "invalid cmd-offset %u\n", val);
> +			return -EINVAL;
> +		}
> +		board->cle = val;
> +	}
> +
> +	ecc_mode = of_get_nand_ecc_mode(np);
> +
> +	board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
> +
> +	board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
> +
> +	if (of_get_nand_bus_width(np) == 16)
> +		board->bus_width_16 = 1;
> +
> +	board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
> +	board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW);
> +
> +	board->enable_pin = of_get_gpio(np, 1);
> +	board->det_pin = of_get_gpio(np, 2);
> +
> +	return 0;
> +}
> +
>  /*
>   * Probe for the NAND device.
>   */
> @@ -479,6 +525,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  	struct nand_chip *nand_chip;
>  	struct resource *regs;
>  	struct resource *mem;
> +	struct mtd_part_parser_data ppdata = {};
>  	int res;
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -505,8 +552,15 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  
>  	mtd = &host->mtd;
>  	nand_chip = &host->nand_chip;
> -	host->board = pdev->dev.platform_data;
>  	host->dev = &pdev->dev;
> +	if (pdev->dev.of_node) {
> +		res = atmel_of_init_port(host, pdev->dev.of_node);

Called here: must compile with !CONFIG_OF

> +		if (res)
> +			goto err_nand_ioremap;
> +	} else {
> +		memcpy(&host->board, pdev->dev.platform_data,
> +		       sizeof(struct atmel_nand_data));
> +	}
>  
>  	nand_chip->priv = host;		/* link the private data structures */
>  	mtd->priv = nand_chip;

Best regards,
Jean-Christophe PLAGNIOL-VILLARD - Feb. 7, 2012, 11:53 a.m.
On 11:30 Tue 07 Feb     , Nicolas Ferre wrote:
> On 02/06/2012 11:35 AM, Jean-Christophe PLAGNIOL-VILLARD :
> > use a local copy of board informatin and fill with DT data
> > 
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > Acked-by: Grant Likely <grant.likely@secretlab.ca>
> > Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> > Cc: devicetree-discuss@lists.ozlabs.org
> > Cc: linux-mtd@lists.infradead.org
> 
> [..]
> 
> > +static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
> > +					 struct device_node *np)
> 
> Maybe you will need to protect this function in case of !DT builds: I
> suspect that some of the of_xxxxx() calls are not provided if !CONFIG_OF.
no-need on the of_ function are static inline it !CONFIG_OF

Best Regards,
J.
Jean-Christophe PLAGNIOL-VILLARD - Feb. 20, 2012, 5:17 p.m.
On 11:35 Mon 06 Feb     , Jean-Christophe PLAGNIOL-VILLARD wrote:
> use a local copy of board informatin and fill with DT data
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: devicetree-discuss@lists.ozlabs.org
> Cc: linux-mtd@lists.infradead.org
> ---
> V2:
> 	comment from Grant
> 	rebase over rc3
HI David,

	I've depeancy on other at91 patch can I apply this series via at91
	tree?

Best Regards,
J.
> 
> Best Regards,
> J.
>  .../devicetree/bindings/mtd/atmel-nand.txt         |   41 ++++++++
>  drivers/mtd/nand/atmel_nand.c                      |  105 ++++++++++++++++----
>  2 files changed, 126 insertions(+), 20 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mtd/atmel-nand.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
> new file mode 100644
> index 0000000..a910ab9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
> @@ -0,0 +1,41 @@
> +Atmel NAND flash
> +
> +Required properties:
> +- compatible : "atmel,at91rm9200-nand".
> +- reg : should specify localbus address and size used for the chip,
> +	and if availlable the ECC.
> +- atmel,nand-addr-offset : offset for the address latch.
> +- atmel,nand-cmd-offset : offset for the command latch.
> +- #address-cells, #size-cells : Must be present if the device has sub-nodes
> +  representing partitions.
> +
> +- gpios : specifies the gpio pins to control the NAND device. detect is an
> +  optional gpio and may be set to 0 if not present.
> +
> +Optional properties:
> +- nand-ecc-mode : String, operation mode of the NAND ecc mode, soft by default.
> +  Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
> +  "soft_bch".
> +- nand-bus-width : 8 or 16 bus width if not present 8
> +- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
> +
> +Examples:
> +nand0: nand@40000000,0 {
> +	compatible = "atmel,at91rm9200-nand";
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	reg = <0x40000000 0x10000000
> +	       0xffffe800 0x200
> +	      >;
> +	atmel,nand-addr-offset = <21>;
> +	atmel,nand-cmd-offset = <22>;
> +	nand-on-flash-bbt = <1>;
> +	nand-ecc-mode = "soft";
> +	gpios = <&pioC 13 0
> +		 &pioC 14 0
> +		 0
> +		>;
> +	partition@0 {
> +		...
> +	};
> +};
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 045d174..7f91ed2 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -27,6 +27,10 @@
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
>  #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_mtd.h>
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/nand.h>
>  #include <linux/mtd/partitions.h>
> @@ -83,7 +87,7 @@ struct atmel_nand_host {
>  	struct mtd_info		mtd;
>  	void __iomem		*io_base;
>  	dma_addr_t		io_phys;
> -	struct atmel_nand_data	*board;
> +	struct atmel_nand_data	board;
>  	struct device		*dev;
>  	void __iomem		*ecc;
>  
> @@ -101,8 +105,8 @@ static int cpu_has_dma(void)
>   */
>  static void atmel_nand_enable(struct atmel_nand_host *host)
>  {
> -	if (gpio_is_valid(host->board->enable_pin))
> -		gpio_set_value(host->board->enable_pin, 0);
> +	if (gpio_is_valid(host->board.enable_pin))
> +		gpio_set_value(host->board.enable_pin, 0);
>  }
>  
>  /*
> @@ -110,8 +114,8 @@ static void atmel_nand_enable(struct atmel_nand_host *host)
>   */
>  static void atmel_nand_disable(struct atmel_nand_host *host)
>  {
> -	if (gpio_is_valid(host->board->enable_pin))
> -		gpio_set_value(host->board->enable_pin, 1);
> +	if (gpio_is_valid(host->board.enable_pin))
> +		gpio_set_value(host->board.enable_pin, 1);
>  }
>  
>  /*
> @@ -132,9 +136,9 @@ static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl
>  		return;
>  
>  	if (ctrl & NAND_CLE)
> -		writeb(cmd, host->io_base + (1 << host->board->cle));
> +		writeb(cmd, host->io_base + (1 << host->board.cle));
>  	else
> -		writeb(cmd, host->io_base + (1 << host->board->ale));
> +		writeb(cmd, host->io_base + (1 << host->board.ale));
>  }
>  
>  /*
> @@ -145,8 +149,8 @@ static int atmel_nand_device_ready(struct mtd_info *mtd)
>  	struct nand_chip *nand_chip = mtd->priv;
>  	struct atmel_nand_host *host = nand_chip->priv;
>  
> -	return gpio_get_value(host->board->rdy_pin) ^
> -                !!host->board->rdy_pin_active_low;
> +	return gpio_get_value(host->board.rdy_pin) ^
> +                !!host->board.rdy_pin_active_low;
>  }
>  
>  /*
> @@ -261,7 +265,7 @@ static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
>  		if (atmel_nand_dma_op(mtd, buf, len, 1) == 0)
>  			return;
>  
> -	if (host->board->bus_width_16)
> +	if (host->board.bus_width_16)
>  		atmel_read_buf16(mtd, buf, len);
>  	else
>  		atmel_read_buf8(mtd, buf, len);
> @@ -277,7 +281,7 @@ static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
>  		if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0)
>  			return;
>  
> -	if (host->board->bus_width_16)
> +	if (host->board.bus_width_16)
>  		atmel_write_buf16(mtd, buf, len);
>  	else
>  		atmel_write_buf8(mtd, buf, len);
> @@ -469,6 +473,48 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
>  	}
>  }
>  
> +static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
> +					 struct device_node *np)
> +{
> +	u32 val;
> +	int ecc_mode;
> +	struct atmel_nand_data *board = &host->board;
> +	enum of_gpio_flags flags;
> +
> +	if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
> +		if (val >= 32) {
> +			dev_err(host->dev, "invalid addr-offset %u\n", val);
> +			return -EINVAL;
> +		}
> +		board->ale = val;
> +	}
> +
> +	if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
> +		if (val >= 32) {
> +			dev_err(host->dev, "invalid cmd-offset %u\n", val);
> +			return -EINVAL;
> +		}
> +		board->cle = val;
> +	}
> +
> +	ecc_mode = of_get_nand_ecc_mode(np);
> +
> +	board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
> +
> +	board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
> +
> +	if (of_get_nand_bus_width(np) == 16)
> +		board->bus_width_16 = 1;
> +
> +	board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
> +	board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW);
> +
> +	board->enable_pin = of_get_gpio(np, 1);
> +	board->det_pin = of_get_gpio(np, 2);
> +
> +	return 0;
> +}
> +
>  /*
>   * Probe for the NAND device.
>   */
> @@ -479,6 +525,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  	struct nand_chip *nand_chip;
>  	struct resource *regs;
>  	struct resource *mem;
> +	struct mtd_part_parser_data ppdata = {};
>  	int res;
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -505,8 +552,15 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  
>  	mtd = &host->mtd;
>  	nand_chip = &host->nand_chip;
> -	host->board = pdev->dev.platform_data;
>  	host->dev = &pdev->dev;
> +	if (pdev->dev.of_node) {
> +		res = atmel_of_init_port(host, pdev->dev.of_node);
> +		if (res)
> +			goto err_nand_ioremap;
> +	} else {
> +		memcpy(&host->board, pdev->dev.platform_data,
> +		       sizeof(struct atmel_nand_data));
> +	}
>  
>  	nand_chip->priv = host;		/* link the private data structures */
>  	mtd->priv = nand_chip;
> @@ -517,10 +571,10 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  	nand_chip->IO_ADDR_W = host->io_base;
>  	nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl;
>  
> -	if (gpio_is_valid(host->board->rdy_pin))
> +	if (gpio_is_valid(host->board.rdy_pin))
>  		nand_chip->dev_ready = atmel_nand_device_ready;
>  
> -	nand_chip->ecc.mode = host->board->ecc_mode;
> +	nand_chip->ecc.mode = host->board.ecc_mode;
>  
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>  	if (!regs && nand_chip->ecc.mode == NAND_ECC_HW) {
> @@ -545,7 +599,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  
>  	nand_chip->chip_delay = 20;		/* 20us command delay time */
>  
> -	if (host->board->bus_width_16)	/* 16-bit bus width */
> +	if (host->board.bus_width_16)	/* 16-bit bus width */
>  		nand_chip->options |= NAND_BUSWIDTH_16;
>  
>  	nand_chip->read_buf = atmel_read_buf;
> @@ -554,15 +608,15 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, host);
>  	atmel_nand_enable(host);
>  
> -	if (gpio_is_valid(host->board->det_pin)) {
> -		if (gpio_get_value(host->board->det_pin)) {
> +	if (gpio_is_valid(host->board.det_pin)) {
> +		if (gpio_get_value(host->board.det_pin)) {
>  			printk(KERN_INFO "No SmartMedia card inserted.\n");
>  			res = -ENXIO;
>  			goto err_no_card;
>  		}
>  	}
>  
> -	if (host->board->on_flash_bbt || on_flash_bbt) {
> +	if (host->board.on_flash_bbt || on_flash_bbt) {
>  		printk(KERN_INFO "atmel_nand: Use On Flash BBT\n");
>  		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
>  	}
> @@ -637,8 +691,9 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	mtd->name = "atmel_nand";
> -	res = mtd_device_parse_register(mtd, NULL, 0,
> -			host->board->parts, host->board->num_parts);
> +	ppdata.of_node = pdev->dev.of_node;
> +	res = mtd_device_parse_register(mtd, NULL, &ppdata,
> +			host->board.parts, host->board.num_parts);
>  	if (!res)
>  		return res;
>  
> @@ -682,11 +737,21 @@ static int __exit atmel_nand_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#if defined(CONFIG_OF)
> +static const struct of_device_id atmel_nand_dt_ids[] = {
> +	{ .compatible = "atmel,at91rm9200-nand" },
> +	{ /* sentinel */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, atmel_nand_dt_ids);
> +#endif
> +
>  static struct platform_driver atmel_nand_driver = {
>  	.remove		= __exit_p(atmel_nand_remove),
>  	.driver		= {
>  		.name	= "atmel_nand",
>  		.owner	= THIS_MODULE,
> +		.of_match_table	= of_match_ptr(atmel_nand_dt_ids),
>  	},
>  };
>  
> -- 
> 1.7.7
David Woodhouse - Feb. 20, 2012, 9:37 p.m.
On Mon, 2012-02-20 at 18:17 +0100, Jean-Christophe PLAGNIOL-VILLARD 
> HI David,
> I've depeancy on other at91 patch can I apply this series via at91
> tree? 

Yes, please do.
Nicolas Ferre - Feb. 21, 2012, 9:22 a.m.
On 02/07/2012 12:53 PM, Jean-Christophe PLAGNIOL-VILLARD :
> On 11:30 Tue 07 Feb     , Nicolas Ferre wrote:
>> On 02/06/2012 11:35 AM, Jean-Christophe PLAGNIOL-VILLARD :
>>> use a local copy of board informatin and fill with DT data
>>>
>>> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
>>> Acked-by: Grant Likely <grant.likely@secretlab.ca>
>>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
>>> Cc: devicetree-discuss@lists.ozlabs.org
>>> Cc: linux-mtd@lists.infradead.org
>>
>> [..]
>>
>>> +static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
>>> +					 struct device_node *np)
>>
>> Maybe you will need to protect this function in case of !DT builds: I
>> suspect that some of the of_xxxxx() calls are not provided if !CONFIG_OF.
> no-need on the of_ function are static inline it !CONFIG_OF

Sorry to come back to this but:

of_get_nand_ecc_mode(np);
of_get_nand_on_flash_bbt(np);

for example are not available in case of non-DT compilation: so we must
protect the atmel_of_init_port() against this error.

Can you please rework another patch.

Bye,
Jean-Christophe PLAGNIOL-VILLARD - Feb. 21, 2012, 9:32 a.m.
On 10:22 Tue 21 Feb     , Nicolas Ferre wrote:
> On 02/07/2012 12:53 PM, Jean-Christophe PLAGNIOL-VILLARD :
> > On 11:30 Tue 07 Feb     , Nicolas Ferre wrote:
> >> On 02/06/2012 11:35 AM, Jean-Christophe PLAGNIOL-VILLARD :
> >>> use a local copy of board informatin and fill with DT data
> >>>
> >>> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> >>> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> >>> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> >>> Cc: devicetree-discuss@lists.ozlabs.org
> >>> Cc: linux-mtd@lists.infradead.org
> >>
> >> [..]
> >>
> >>> +static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
> >>> +					 struct device_node *np)
> >>
> >> Maybe you will need to protect this function in case of !DT builds: I
> >> suspect that some of the of_xxxxx() calls are not provided if !CONFIG_OF.
> > no-need on the of_ function are static inline it !CONFIG_OF
> 
> Sorry to come back to this but:
> 
> of_get_nand_ecc_mode(np);
> of_get_nand_on_flash_bbt(np);
> 
> for example are not available in case of non-DT compilation: so we must
> protect the atmel_of_init_port() against this error.
> 
> Can you please rework another patch.
yes seen too update send

Best Regards,
J.

Patch

diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
new file mode 100644
index 0000000..a910ab9
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
@@ -0,0 +1,41 @@ 
+Atmel NAND flash
+
+Required properties:
+- compatible : "atmel,at91rm9200-nand".
+- reg : should specify localbus address and size used for the chip,
+	and if availlable the ECC.
+- atmel,nand-addr-offset : offset for the address latch.
+- atmel,nand-cmd-offset : offset for the command latch.
+- #address-cells, #size-cells : Must be present if the device has sub-nodes
+  representing partitions.
+
+- gpios : specifies the gpio pins to control the NAND device. detect is an
+  optional gpio and may be set to 0 if not present.
+
+Optional properties:
+- nand-ecc-mode : String, operation mode of the NAND ecc mode, soft by default.
+  Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
+  "soft_bch".
+- nand-bus-width : 8 or 16 bus width if not present 8
+- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
+
+Examples:
+nand0: nand@40000000,0 {
+	compatible = "atmel,at91rm9200-nand";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	reg = <0x40000000 0x10000000
+	       0xffffe800 0x200
+	      >;
+	atmel,nand-addr-offset = <21>;
+	atmel,nand-cmd-offset = <22>;
+	nand-on-flash-bbt = <1>;
+	nand-ecc-mode = "soft";
+	gpios = <&pioC 13 0
+		 &pioC 14 0
+		 0
+		>;
+	partition@0 {
+		...
+	};
+};
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 045d174..7f91ed2 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -27,6 +27,10 @@ 
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_mtd.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
@@ -83,7 +87,7 @@  struct atmel_nand_host {
 	struct mtd_info		mtd;
 	void __iomem		*io_base;
 	dma_addr_t		io_phys;
-	struct atmel_nand_data	*board;
+	struct atmel_nand_data	board;
 	struct device		*dev;
 	void __iomem		*ecc;
 
@@ -101,8 +105,8 @@  static int cpu_has_dma(void)
  */
 static void atmel_nand_enable(struct atmel_nand_host *host)
 {
-	if (gpio_is_valid(host->board->enable_pin))
-		gpio_set_value(host->board->enable_pin, 0);
+	if (gpio_is_valid(host->board.enable_pin))
+		gpio_set_value(host->board.enable_pin, 0);
 }
 
 /*
@@ -110,8 +114,8 @@  static void atmel_nand_enable(struct atmel_nand_host *host)
  */
 static void atmel_nand_disable(struct atmel_nand_host *host)
 {
-	if (gpio_is_valid(host->board->enable_pin))
-		gpio_set_value(host->board->enable_pin, 1);
+	if (gpio_is_valid(host->board.enable_pin))
+		gpio_set_value(host->board.enable_pin, 1);
 }
 
 /*
@@ -132,9 +136,9 @@  static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl
 		return;
 
 	if (ctrl & NAND_CLE)
-		writeb(cmd, host->io_base + (1 << host->board->cle));
+		writeb(cmd, host->io_base + (1 << host->board.cle));
 	else
-		writeb(cmd, host->io_base + (1 << host->board->ale));
+		writeb(cmd, host->io_base + (1 << host->board.ale));
 }
 
 /*
@@ -145,8 +149,8 @@  static int atmel_nand_device_ready(struct mtd_info *mtd)
 	struct nand_chip *nand_chip = mtd->priv;
 	struct atmel_nand_host *host = nand_chip->priv;
 
-	return gpio_get_value(host->board->rdy_pin) ^
-                !!host->board->rdy_pin_active_low;
+	return gpio_get_value(host->board.rdy_pin) ^
+                !!host->board.rdy_pin_active_low;
 }
 
 /*
@@ -261,7 +265,7 @@  static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 		if (atmel_nand_dma_op(mtd, buf, len, 1) == 0)
 			return;
 
-	if (host->board->bus_width_16)
+	if (host->board.bus_width_16)
 		atmel_read_buf16(mtd, buf, len);
 	else
 		atmel_read_buf8(mtd, buf, len);
@@ -277,7 +281,7 @@  static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 		if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0)
 			return;
 
-	if (host->board->bus_width_16)
+	if (host->board.bus_width_16)
 		atmel_write_buf16(mtd, buf, len);
 	else
 		atmel_write_buf8(mtd, buf, len);
@@ -469,6 +473,48 @@  static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
 	}
 }
 
+static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
+					 struct device_node *np)
+{
+	u32 val;
+	int ecc_mode;
+	struct atmel_nand_data *board = &host->board;
+	enum of_gpio_flags flags;
+
+	if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
+		if (val >= 32) {
+			dev_err(host->dev, "invalid addr-offset %u\n", val);
+			return -EINVAL;
+		}
+		board->ale = val;
+	}
+
+	if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
+		if (val >= 32) {
+			dev_err(host->dev, "invalid cmd-offset %u\n", val);
+			return -EINVAL;
+		}
+		board->cle = val;
+	}
+
+	ecc_mode = of_get_nand_ecc_mode(np);
+
+	board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
+
+	board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
+
+	if (of_get_nand_bus_width(np) == 16)
+		board->bus_width_16 = 1;
+
+	board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
+	board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW);
+
+	board->enable_pin = of_get_gpio(np, 1);
+	board->det_pin = of_get_gpio(np, 2);
+
+	return 0;
+}
+
 /*
  * Probe for the NAND device.
  */
@@ -479,6 +525,7 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 	struct nand_chip *nand_chip;
 	struct resource *regs;
 	struct resource *mem;
+	struct mtd_part_parser_data ppdata = {};
 	int res;
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -505,8 +552,15 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 
 	mtd = &host->mtd;
 	nand_chip = &host->nand_chip;
-	host->board = pdev->dev.platform_data;
 	host->dev = &pdev->dev;
+	if (pdev->dev.of_node) {
+		res = atmel_of_init_port(host, pdev->dev.of_node);
+		if (res)
+			goto err_nand_ioremap;
+	} else {
+		memcpy(&host->board, pdev->dev.platform_data,
+		       sizeof(struct atmel_nand_data));
+	}
 
 	nand_chip->priv = host;		/* link the private data structures */
 	mtd->priv = nand_chip;
@@ -517,10 +571,10 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 	nand_chip->IO_ADDR_W = host->io_base;
 	nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl;
 
-	if (gpio_is_valid(host->board->rdy_pin))
+	if (gpio_is_valid(host->board.rdy_pin))
 		nand_chip->dev_ready = atmel_nand_device_ready;
 
-	nand_chip->ecc.mode = host->board->ecc_mode;
+	nand_chip->ecc.mode = host->board.ecc_mode;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!regs && nand_chip->ecc.mode == NAND_ECC_HW) {
@@ -545,7 +599,7 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 
 	nand_chip->chip_delay = 20;		/* 20us command delay time */
 
-	if (host->board->bus_width_16)	/* 16-bit bus width */
+	if (host->board.bus_width_16)	/* 16-bit bus width */
 		nand_chip->options |= NAND_BUSWIDTH_16;
 
 	nand_chip->read_buf = atmel_read_buf;
@@ -554,15 +608,15 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, host);
 	atmel_nand_enable(host);
 
-	if (gpio_is_valid(host->board->det_pin)) {
-		if (gpio_get_value(host->board->det_pin)) {
+	if (gpio_is_valid(host->board.det_pin)) {
+		if (gpio_get_value(host->board.det_pin)) {
 			printk(KERN_INFO "No SmartMedia card inserted.\n");
 			res = -ENXIO;
 			goto err_no_card;
 		}
 	}
 
-	if (host->board->on_flash_bbt || on_flash_bbt) {
+	if (host->board.on_flash_bbt || on_flash_bbt) {
 		printk(KERN_INFO "atmel_nand: Use On Flash BBT\n");
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 	}
@@ -637,8 +691,9 @@  static int __init atmel_nand_probe(struct platform_device *pdev)
 	}
 
 	mtd->name = "atmel_nand";
-	res = mtd_device_parse_register(mtd, NULL, 0,
-			host->board->parts, host->board->num_parts);
+	ppdata.of_node = pdev->dev.of_node;
+	res = mtd_device_parse_register(mtd, NULL, &ppdata,
+			host->board.parts, host->board.num_parts);
 	if (!res)
 		return res;
 
@@ -682,11 +737,21 @@  static int __exit atmel_nand_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_nand_dt_ids[] = {
+	{ .compatible = "atmel,at91rm9200-nand" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, atmel_nand_dt_ids);
+#endif
+
 static struct platform_driver atmel_nand_driver = {
 	.remove		= __exit_p(atmel_nand_remove),
 	.driver		= {
 		.name	= "atmel_nand",
 		.owner	= THIS_MODULE,
+		.of_match_table	= of_match_ptr(atmel_nand_dt_ids),
 	},
 };