'\" t
.\"     Title: spi_alloc_master
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Serial Peripheral Interface (SPI)
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "SPI_ALLOC_MASTER" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Serial Peripheral Interface (S"
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.SH "NAME"
spi_alloc_master \- allocate SPI master controller
.SH "SYNOPSIS"
.HP \w'struct\ spi_master\ *\ spi_alloc_master('u
.BI "struct spi_master * spi_alloc_master(struct\ device\ *\ " "dev" ", unsigned\ " "size" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
the controller, possibly using the platform_bus
.RE
.PP
\fIsize\fR
.RS 4
how much zeroed driver\-private data to allocate; the pointer to this memory is in the driver_data field of the returned device, accessible with
\fBspi_master_get_devdata\fR\&.
.RE
.SH "CONTEXT"
.PP
can sleep
.SH "DESCRIPTION"
.PP
This call is used only by SPI master controller drivers, which are the only ones directly touching chip registers\&. It\*(Aqs how they allocate an spi_master structure, prior to calling
\fBspi_register_master\fR\&.
.PP
This must be called from context that can sleep\&. It returns the SPI master structure on success, else NULL\&.
.PP
The caller is responsible for assigning the bus number and initializing the master\*(Aqs methods before calling
\fBspi_register_master\fR; and (after errors adding the device) calling
\fBspi_master_put\fR
to prevent a memory leak\&.
.SH "COPYRIGHT"
.br