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mtd: rawnand: Allocate the interface configurations dynamically

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Instead of manipulating the statically allocated structure and copy
timings around, allocate one at identification time and save it in the
nand_chip structure once it has been initialized.

All NAND chips using the same interface configuration during reset and
startup, we define a helper to retrieve a single reset interface
configuration object, shared across all NAND chips.

We use a second pointer to always have a reference on the currently
applied interface configuration, which may either point to the "best
interface configuration" or to the "default reset interface
configuration".

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200529111322.7184-29-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal
2020-05-29 13:13:22 +02:00
parent a69ad11168
commit 35b6bcc970
4 changed files with 68 additions and 36 deletions
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11
include/linux/mtd/rawnand.h
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@@ -1069,7 +1069,11 @@ struct nand_manufacturer {
* @options: Various chip options. They can partly be set to inform nand_scan
* about special functionality. See the defines for further
* explanation.
* @interface_config: NAND interface timing information
* @current_interface_config: The currently used NAND interface configuration
* @best_interface_config: The best NAND interface configuration which fits both
* the NAND chip and NAND controller constraints. If
* unset, the default reset interface configuration must
* be used.
* @bbt_erase_shift: Number of address bits in a bbt entry
* @bbt_options: Bad block table specific options. All options used here must
* come from bbm.h. By default, these options will be copied to
@@ -1116,7 +1120,8 @@ struct nand_chip {
unsigned int options;
/* Data interface */
struct nand_interface_config interface_config;
const struct nand_interface_config *current_interface_config;
struct nand_interface_config *best_interface_config;
/* Bad block information */
unsigned int bbt_erase_shift;
@@ -1209,7 +1214,7 @@ static inline struct device_node *nand_get_flash_node(struct nand_chip *chip)
static inline const struct nand_interface_config *
nand_get_interface_config(struct nand_chip *chip)
{
return &chip->interface_config;
return chip->current_interface_config;
}
/*