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mtd: nand: denali: introduce capability flag 

The Denali NAND controller IP has various customizable features.
SoC vendors can choose desired functions when a delivery RTL is
created.  It means there are several variants for this IP.  For
example, the Intel version is equipped with 32bit DMA, whereas the
IP for UniPhier SoC family with 64bit DMA.

This driver was originally written for some Intel platforms with
Intel specific things hard-coded.  What is worse, the revision
register of this IP does not work to distinguish such features.
We need to do something to make the driver available for other SoCs.

Let's introduce a caps member to the denali_nand_info structure to
switch on/off various features.  Also, add struct denali_dt_data to
store the capability associated with compatible string.

Boris suggested this approach in discussion [1] instead of a new DT
property for every feature.

[1] https://lkml.org/lkml/2016/3/29/142

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Masahiro Yamada 2017-03-23 05:07:07 +09:00 committed by Boris Brezillon
parent 1aded58a27
commit be72a4aa8e
2 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/mtd/nand/denali.h
View File

@ -338,6 +338,7 @@ struct denali_nand_info {
uint32_t devnum; /* represent how many nands connected */
uint32_t bbtskipbytes;
uint32_t max_banks;
unsigned int caps;
};
extern int denali_init(struct denali_nand_info *denali);

18
drivers/mtd/nand/denali_dt.c
View File

@ -29,6 +29,10 @@ struct denali_dt {
struct clk *clk;
};
struct denali_dt_data {
unsigned int caps;
};
static const struct of_device_id denali_nand_dt_ids[] = {
{ .compatible = "denali,denali-nand-dt" },
{ /* sentinel */ }
@ -42,23 +46,19 @@ static int denali_dt_probe(struct platform_device *ofdev)
{
struct resource *denali_reg, *nand_data;
struct denali_dt *dt;
const struct denali_dt_data *data;
struct denali_nand_info *denali;
int ret;
const struct of_device_id *of_id;
of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
if (of_id) {
ofdev->id_entry = of_id->data;
} else {
pr_err("Failed to find the right device id.\n");
return -ENOMEM;
}
dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
if (!dt)
return -ENOMEM;
denali = &dt->denali;
data = of_device_get_match_data(&ofdev->dev);
if (data)
denali->caps = data->caps;
denali->platform = DT;
denali->dev = &ofdev->dev;
denali->irq = platform_get_irq(ofdev, 0);