]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/of/of_spi.c
2 * SPI OF support routines
3 * Copyright (C) 2008 Secret Lab Technologies Ltd.
5 * Support routines for deriving SPI device attachments from the device
10 #include <linux/device.h>
11 #include <linux/spi/spi.h>
12 #include <linux/of_spi.h>
15 * of_register_spi_devices - Register child devices onto the SPI bus
16 * @master: Pointer to spi_master device
17 * @np: parent node of SPI device nodes
19 * Registers an spi_device for each child node of 'np' which has a 'reg'
22 void of_register_spi_devices(struct spi_master
*master
, struct device_node
*np
)
24 struct spi_device
*spi
;
25 struct device_node
*nc
;
30 for_each_child_of_node(np
, nc
) {
31 /* Alloc an spi_device */
32 spi
= spi_alloc_device(master
);
34 dev_err(&master
->dev
, "spi_device alloc error for %s\n",
40 /* Select device driver */
41 if (of_modalias_node(nc
, spi
->modalias
,
42 sizeof(spi
->modalias
)) < 0) {
43 dev_err(&master
->dev
, "cannot find modalias for %s\n",
50 prop
= of_get_property(nc
, "reg", &len
);
51 if (!prop
|| len
< sizeof(*prop
)) {
52 dev_err(&master
->dev
, "%s has no 'reg' property\n",
57 spi
->chip_select
= *prop
;
59 /* Mode (clock phase/polarity/etc.) */
60 if (of_find_property(nc
, "spi-cpha", NULL
))
61 spi
->mode
|= SPI_CPHA
;
62 if (of_find_property(nc
, "spi-cpol", NULL
))
63 spi
->mode
|= SPI_CPOL
;
66 prop
= of_get_property(nc
, "spi-max-frequency", &len
);
67 if (!prop
|| len
< sizeof(*prop
)) {
68 dev_err(&master
->dev
, "%s has no 'spi-max-frequency' property\n",
73 spi
->max_speed_hz
= *prop
;
76 spi
->irq
= irq_of_parse_and_map(nc
, 0);
78 /* Store a pointer to the node in the device structure */
80 spi
->dev
.archdata
.of_node
= nc
;
82 /* Register the new device */
83 request_module(spi
->modalias
);
84 rc
= spi_add_device(spi
);
86 dev_err(&master
->dev
, "spi_device register error %s\n",
93 EXPORT_SYMBOL(of_register_spi_devices
);