Em quinta-feira, 23 de janeiro de 2014 17h24min27s UTC-3, Tomas Novotny
escreveu:
> On Thu, 23 Jan 2014 19:11:32 +0100, Gustavo Zamboni
>
> <gustavozamb...@gmail.com> wrote:
>
>
>
> Hi Gustavo,
>
>
>
> > Why dont you just add the device to the fex file ??
>
> >
>
> > activate your spix_para parameters
>
> >
>
> > and add something like:
>
> >
>
> >
>
> > |[spi_devices]|
>
> > spi_dev_num=1
>
> >
>
> > |[spi_board0]|
>
> > |modalias| |= ||"|mcp251x|"|||
>
> > |max_speed_hz| |= ||12000000|
>
> > |bus_num| |= ||1|
>
> > |chip_select| |= ||0|
>
> > |mode| |= ||3|
>
> > |full_duplex| |= ||0|
>
> > |manual_cs| |= ||0|
>
> >
>
> >
>
> > With spidev it works well with modalias "spidev".
>
>
>
> yes, this is exactly what I did. I was trying both spidev and mcp251x. There
>
> is no problem with spidev (it is currently working) but for mcp251x I need to
>
> pass (very simple) platform data with oscillator frequency. The mcp251x is
>
> being initialized during boot but it fails because of missing platform data.
>
> I don't know if there is some "clean" way how to pass platform data
>
> of the mcp251x driver. I think that FEX is not able to do that (there is no
>
> handling in sunxi spi).
>
> Thanks for you answer,
>
>
>
> Tomas
>
>
>
> > Gustavo Zamboni
>
> >
>
> >
>
> >
>
> >
>
> > Le 23/01/2014 18:03, vinicius...@gmail.com a écrit :
>
> > > Em quinta-feira, 23 de janeiro de 2014 13h59min19s UTC-3,
> > > vinic...@gmail.com escreveu:
>
> > >> Em terça-feira, 21 de janeiro de 2014 08h44min19s UTC-3, Tomas Novotny
> > >> escreveu:
>
> > >>
>
> > >>> Hi All,
>
> > >>> I'm trying to use some SPI devices on A10s OLinuXino. It was flawless
> > >>> for
>
> > >>> simple MCU driven by spidev (everything needed is defined in FEX). Now
> > >>> I'm
>
> > >>> trying to connect external CAN over SPI (MCP2515).
>
> > >>> The mcp251x driver needs to pass oscillator frequency through
> > >>> the
>
> > >>> mcp251x_platform_data structure. Is there any clean way how to do it on
> > >>> 3.4
>
> > >>> linux-sunxi? It seems that platform data for SPI board aren't passed by
> > >>> sunxi
>
> > >>> SPI driver.
>
> > >>> I'm using Debian image with custom built 3.4.61 linux-sunxi.
>
> > >>> Thanks to all,
>
> > >>> Tomas
>
> > >>
>
> > >>
>
> > >> You can change by yourself spi_sunxi.c, something like that:
>
> > >>
>
> > >>
>
> > >>
>
> > >> diff --git a/drivers/spi/spi_sunxi.c b/drivers/spi/spi_sunxi.c
>
> > >>
>
> > >> index a3792fd..2f0ab7c 100644
>
> > >>
>
> > >> --- a/drivers/spi/spi_sunxi.c
>
> > >>
>
> > >> +++ b/drivers/spi/spi_sunxi.c
>
> > >>
>
> > >> @@ -28,6 +28,7 @@
>
> > >>
>
> > >>
>
> > >>
>
> > >> #include <linux/spi/spi.h>
>
> > >>
>
> > >> #include <linux/spi/spi_bitbang.h>
>
> > >>
>
> > >> +#include <linux/can/platform/mcp251x.h>
>
> > >>
>
> > >>
>
> > >>
>
> > >> #include <asm/io.h>
>
> > >>
>
> > >> #include <plat/dma.h>
>
> > >>
>
> > >> @@ -134,6 +135,10 @@ struct sunxi_spi {
>
> > >>
>
> > >> int cs_bitmap;/* cs0- 0x1; cs1-0x2, cs0&cs1-0x3. */
>
> > >>
>
> > >> };
>
> > >>
>
> > >>
>
> > >>
>
> > >> +static struct mcp251x_platform_data mcp251x_info = {
>
> > >>
>
> > >> + .oscillator_frequency = 8000000,
>
> > >>
>
> > >> +};
>
> > >>
>
> > >> +
>
> > > Sorry, something like that:
>
> > >
>
> > > diff --git a/drivers/spi/spi_sunxi.c b/drivers/spi/spi_sunxi.c
>
> > > index a3792fd..2f0ab7c 100644
>
> > > --- a/drivers/spi/spi_sunxi.c
>
> > > +++ b/drivers/spi/spi_sunxi.c
>
> > > @@ -28,6 +28,7 @@
>
> > >
>
> > > #include <linux/spi/spi.h>
>
> > > #include <linux/spi/spi_bitbang.h>
>
> > > +#include <linux/can/platform/mcp251x.h>
>
> > >
>
> > > #include <asm/io.h>
>
> > > #include <plat/dma.h>
>
> > > @@ -134,6 +135,10 @@ struct sunxi_spi {
>
> > > int cs_bitmap;/* cs0- 0x1; cs1-0x2, cs0&cs1-0x3. */
>
> > > };
>
> > >
>
> > > +static struct mcp251x_platform_data mcp251x_info = {
>
> > > + .oscillator_frequency = 8000000,
>
> > > +};
>
> > > +
>
> > > /* config chip select */
>
> > > s32 aw_spi_set_cs(u32 chipselect, void *base_addr)
>
> > > {
>
> > > @@ -1922,6 +1927,7 @@ int __devinit spi_sunxi_register_spidev(void)
>
> > > {
>
> > > board = &spi_boards[i];
>
> > > sprintf(spi_board_name, "spi_board%d", i);
>
> > > + board->platform_data = &mcp251x_info;
>
> > > ret = script_parser_fetch(spi_board_name, "modalias",
> > > (void*)board->modalias, sizeof(char*));
>
> > > if(ret != SCRIPT_PARSER_OK) {
>
> > > spi_msg("Get spi devices modalias failed\n");
>
> > >
>
> >
Hi Tomas,
your fex is ok, now you just change spi_sunxi.c as suggested or the way you
think best, that is enough.
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