mtd: Add orion_nand devicetree bindings
Allow a NAND chip using the orion_nand driver to be described using devicetree. Changes since last submission (V4) [Addressing comments by]:- * WARN when bank-width is out of range [Andrew Lunn] Changes since last submission (V3):- * Document all parameters [Grant Likely] * Convert bank-width to be in bytes * Add explicit defaults for cle, ale and bank-width Signed-off-by: Jamie Lentin <jm@lentin.co.uk> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Jamie Lentin
Jason Cooper
parent
9007d10073
commit
a0fabf722c
|
|
@ -0,0 +1,50 @@
|
|||
NAND support for Marvell Orion SoC platforms
|
||||
|
||||
Required properties:
|
||||
- compatible : "mrvl,orion-nand".
|
||||
- reg : Base physical address of the NAND and length of memory mapped
|
||||
region
|
||||
|
||||
Optional properties:
|
||||
- cle : Address line number connected to CLE. Default is 0
|
||||
- ale : Address line number connected to ALE. Default is 1
|
||||
- bank-width : Width in bytes of the device. Default is 1
|
||||
- chip-delay : Chip dependent delay for transferring data from array to read
|
||||
registers in usecs
|
||||
|
||||
The device tree may optionally contain sub-nodes describing partitions of the
|
||||
address space. See partition.txt for more detail.
|
||||
|
||||
Example:
|
||||
|
||||
nand@f4000000 {
|
||||
#address-cells = <1>;
|
||||
#size-cells = <1>;
|
||||
cle = <0>;
|
||||
ale = <1>;
|
||||
bank-width = <1>;
|
||||
chip-delay = <25>;
|
||||
compatible = "mrvl,orion-nand";
|
||||
reg = <0xf4000000 0x400>;
|
||||
|
||||
partition@0 {
|
||||
label = "u-boot";
|
||||
reg = <0x0000000 0x100000>;
|
||||
read-only;
|
||||
};
|
||||
|
||||
partition@100000 {
|
||||
label = "uImage";
|
||||
reg = <0x0100000 0x200000>;
|
||||
};
|
||||
|
||||
partition@300000 {
|
||||
label = "dtb";
|
||||
reg = <0x0300000 0x100000>;
|
||||
};
|
||||
|
||||
partition@400000 {
|
||||
label = "root";
|
||||
reg = <0x0400000 0x7d00000>;
|
||||
};
|
||||
};
|
||||
|
|
@ -13,6 +13,7 @@
|
|||
#include <linux/slab.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include <linux/mtd/nand.h>
|
||||
#include <linux/mtd/partitions.h>
|
||||
|
|
@ -74,11 +75,13 @@ static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
|
|||
static int __init orion_nand_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct mtd_info *mtd;
|
||||
struct mtd_part_parser_data ppdata = {};
|
||||
struct nand_chip *nc;
|
||||
struct orion_nand_data *board;
|
||||
struct resource *res;
|
||||
void __iomem *io_base;
|
||||
int ret = 0;
|
||||
u32 val = 0;
|
||||
|
||||
nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
|
||||
if (!nc) {
|
||||
|
|
@ -101,7 +104,32 @@ static int __init orion_nand_probe(struct platform_device *pdev)
|
|||
goto no_res;
|
||||
}
|
||||
|
||||
board = pdev->dev.platform_data;
|
||||
if (pdev->dev.of_node) {
|
||||
board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
|
||||
GFP_KERNEL);
|
||||
if (!board) {
|
||||
printk(KERN_ERR "orion_nand: failed to allocate board structure.\n");
|
||||
ret = -ENOMEM;
|
||||
goto no_res;
|
||||
}
|
||||
if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
|
||||
board->cle = (u8)val;
|
||||
else
|
||||
board->cle = 0;
|
||||
if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
|
||||
board->ale = (u8)val;
|
||||
else
|
||||
board->ale = 1;
|
||||
if (!of_property_read_u32(pdev->dev.of_node,
|
||||
"bank-width", &val))
|
||||
board->width = (u8)val * 8;
|
||||
else
|
||||
board->width = 8;
|
||||
if (!of_property_read_u32(pdev->dev.of_node,
|
||||
"chip-delay", &val))
|
||||
board->chip_delay = (u8)val;
|
||||
} else
|
||||
board = pdev->dev.platform_data;
|
||||
|
||||
mtd->priv = nc;
|
||||
mtd->owner = THIS_MODULE;
|
||||
|
|
@ -115,6 +143,10 @@ static int __init orion_nand_probe(struct platform_device *pdev)
|
|||
if (board->chip_delay)
|
||||
nc->chip_delay = board->chip_delay;
|
||||
|
||||
WARN(board->width > 16,
|
||||
"%d bit bus width out of range",
|
||||
board->width);
|
||||
|
||||
if (board->width == 16)
|
||||
nc->options |= NAND_BUSWIDTH_16;
|
||||
|
||||
|
|
@ -129,8 +161,9 @@ static int __init orion_nand_probe(struct platform_device *pdev)
|
|||
}
|
||||
|
||||
mtd->name = "orion_nand";
|
||||
ret = mtd_device_parse_register(mtd, NULL, NULL, board->parts,
|
||||
board->nr_parts);
|
||||
ppdata.of_node = pdev->dev.of_node;
|
||||
ret = mtd_device_parse_register(mtd, NULL, &ppdata,
|
||||
board->parts, board->nr_parts);
|
||||
if (ret) {
|
||||
nand_release(mtd);
|
||||
goto no_dev;
|
||||
|
|
@ -161,11 +194,19 @@ static int __devexit orion_nand_remove(struct platform_device *pdev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static struct of_device_id orion_nand_of_match_table[] = {
|
||||
{ .compatible = "mrvl,orion-nand", },
|
||||
{},
|
||||
};
|
||||
#endif
|
||||
|
||||
static struct platform_driver orion_nand_driver = {
|
||||
.remove = __devexit_p(orion_nand_remove),
|
||||
.driver = {
|
||||
.name = "orion_nand",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(orion_nand_of_match_table),
|
||||
},
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue