diff options
Diffstat (limited to 'include/spi.h')
| -rw-r--r-- | include/spi.h | 42 |
1 files changed, 32 insertions, 10 deletions
diff --git a/include/spi.h b/include/spi.h index ec17bd0..c58e453 100644 --- a/include/spi.h +++ b/include/spi.h @@ -56,20 +56,42 @@ #define SPI_DEFAULT_WORDLEN 8 #ifdef CONFIG_DM_SPI +/* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */ struct dm_spi_bus { uint max_hz; }; +/** + * struct dm_spi_platdata - platform data for all SPI slaves + * + * This describes a SPI slave, a child device of the SPI bus. To obtain this + * struct from a spi_slave, use dev_get_parent_platdata(dev) or + * dev_get_parent_platdata(slave->dev). + * + * This data is immuatable. Each time the device is probed, @max_hz and @mode + * will be copied to struct spi_slave. + * + * @cs: Chip select number (0..n-1) + * @max_hz: Maximum bus speed that this slave can tolerate + * @mode: SPI mode to use for this device (see SPI mode flags) + */ +struct dm_spi_slave_platdata { + unsigned int cs; + uint max_hz; + uint mode; +}; + #endif /* CONFIG_DM_SPI */ /** * struct spi_slave - Representation of a SPI slave * * For driver model this is the per-child data used by the SPI bus. It can - * be accessed using dev_get_parentdata() on the slave device. Each SPI - * driver should define this child data in its U_BOOT_DRIVER() definition: - * - * .per_child_auto_alloc_size = sizeof(struct spi_slave), + * be accessed using dev_get_parentdata() on the slave device. The SPI uclass + * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the + * driver should not override it. Two platform data fields (max_hz and mode) + * are copied into this structure to provide an initial value. This allows + * them to be changed, since we should never change platform data in drivers. * * If not using driver model, drivers are expected to extend this with * controller-specific data. @@ -97,8 +119,8 @@ struct spi_slave { uint mode; #else unsigned int bus; -#endif unsigned int cs; +#endif u8 op_mode_rx; u8 op_mode_tx; unsigned int wordlen; @@ -545,16 +567,16 @@ int spi_chip_select(struct udevice *slave); int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp); /** - * spi_ofdata_to_platdata() - decode standard SPI platform data + * spi_slave_ofdata_to_platdata() - decode standard SPI platform data * - * This decodes the speed and mode from a device tree node and puts it into - * the spi_slave structure. + * This decodes the speed and mode for a slave from a device tree node * * @blob: Device tree blob * @node: Node offset to read from - * @spi: Place to put the decoded information + * @plat: Place to put the decoded information */ -int spi_ofdata_to_platdata(const void *blob, int node, struct spi_slave *spi); +int spi_slave_ofdata_to_platdata(const void *blob, int node, + struct dm_spi_slave_platdata *plat); /** * spi_cs_info() - Check information on a chip select |