atmel,sam-flash

Vendor: Atmel Corporation

Description

This binding describes the Atmel SAM flash area layout.

The Atmel SAM flash area varies in write-block-size, memory area,
and the layout of erase-blocks.

E.g. the flash area layout of the ATSAM4E16C:

  |--------------------|
  | 8 Kbytes           |  erase block size = 2048
  |--------------------|
  | 8 Kbytes           |  erase block size = 2048
  |--------------------|
  | 48 Kbytes          |  erase block size = 4096
  |--------------------|
  | 64 Kbytes          |  erase block size = 4096
  |--------------------|
  | ...                |

The ATSAM4E16C has a flash area which is 1000Kbytes
(1024 * 1024 bytes) with a write-block-size of 8 bytes. The first
16 Kbytes can be erased in blocks of 2048 bytes
(8 blocks of 2048 bytes), the remaining flash area is erasable
in blocks of 4096 bytes (252 blocks of 4096 bytes).

This flash area layout would described as:

  / {
    soc {
      eefc: flash-controller@400e0a00 {
      compatible = "atmel,sam-flash-controller";
      reg = <0x400e0a00 0x200>;
      clocks = <&pmc PMC_TYPE_PERIPHERAL 6>;
      status = "okay";

      #address-cells = <1>;
      #size-cells = <1>;
      #erase-block-cells = <2>;

      flash0: flash@400000 {
        compatible = "atmel,sam-flash", "soc-nv-flash";
        reg = <0x400000 0x100000>;
        write-block-size = <8>;
        erase-block-size = <4096>;
        erase-blocks = <&eefc 8 2048>, <&eefc 252 4096>;
      };
    };
  };

Notes:
  The flash area layout node flash0 should have both this
  compatible, "atmel,sam-flash", and the "soc-nv-flash"
  compatible. The latter is used from mcuboot and other
  modules to identify the flash area.

  If partitions are used, remember that their addresses are
  offsets relative to the flash area address.  E.g. using
  mcuboot and a allocating a storage partition:

    &flash0 {
      partitions {
        compatible = "fixed-partitions";
        #address-cells = <1>;
        #size-cells = <1>;

        boot_partition: partition@0 {
          label = "mcuboot";
          reg = <0x0 0x10000>;
        };

        slot0_partition: partition@10000 {
          label = "slot0";
          reg = <0x10000 0x70000>;
        };

        slot1_partition: partition@80000 {
          label = "slot1";
          reg = <0x80000 0x70000>;
        };

        storage_partition: partition@f0000 {
          label = "storage";
          reg = <0xf0000 0x100000>;
        };
      };
    };

Properties

Node specific properties

Properties not inherited from the base binding file.

Name	Type	Details
write-block-size	int	The flash controller is limited by hardware to writing blocks of this size, aligned to this size, in bytes, to previously erased flash, within the flash memory area.
erase-block-size	int	The flash controller is limited by hardware to erase whole blocks of flash at a time. This property describes the largest erase block size in erase-blocks.
erase-blocks	phandle-array	The flash controller is limited by hardware to erase whole blocks of flash at a time. This property describes the layout of the erase-blocks, which can vary in size within the flash memory area. This property is required.

Deprecated node specific properties

Deprecated properties not inherited from the base binding file.

(None)

Base properties

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “atmel,sam-flash” compatible.

Name	Type	Details
status	string	indicates the operational status of a device Legal values: 'ok', 'okay', 'disabled', 'reserved', 'fail', 'fail-sss' See Important properties for more information.
compatible	string-array	compatible strings This property is required. See Important properties for more information.
reg	array	register space See Important properties for more information.
reg-names	string-array	name of each register space
interrupts	array	interrupts for device See Important properties for more information.
interrupts-extended	compound	extended interrupt specifier for device
interrupt-names	string-array	name of each interrupt
interrupt-parent	phandle	phandle to interrupt controller node
label	string	Human readable string describing the device (used as device_get_binding() argument) See Important properties for more information. This property is deprecated.
clocks	phandle-array	Clock gate information
clock-names	string-array	name of each clock
#address-cells	int	number of address cells in reg property
#size-cells	int	number of size cells in reg property
dmas	phandle-array	DMA channels specifiers
dma-names	string-array	Provided names of DMA channel specifiers
io-channels	phandle-array	IO channels specifiers
io-channel-names	string-array	Provided names of IO channel specifiers
mboxes	phandle-array	mailbox / IPM channels specifiers
mbox-names	string-array	Provided names of mailbox / IPM channel specifiers
power-domains	phandle-array	Power domain specifiers
power-domain-names	string-array	Provided names of power domain specifiers
#power-domain-cells	int	Number of cells in power-domains property
zephyr,deferred-init	boolean	Do not initialize device automatically on boot. Device should be manually initialized using device_init().
wakeup-source	boolean	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.
zephyr,pm-device-runtime-auto	boolean	Automatically configure the device for runtime power management after the init function runs.
zephyr,disabling-power-states	phandles	List of power states that will disable this device power.