On Mon, 27 Jan 2014 08:42:51 -0800 (PST), [email protected]
<[email protected]> wrote:
> 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
> >
> > <[email protected]> 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, [email protected] a écrit :
> >
> > > > Em quinta-feira, 23 de janeiro de 2014 13h59min19s UTC-3,
> > > > [email protected] 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.
>
Hi Vinicius,
finally the osc frequency was harcoded to mcp251x driver and the device is
now being initialized. I was just curious if there is some clean way.
Unfortunately mcp chip is not working yet as there is some problem
with communication over spi. I will check spi with some analyzer soon. But
this is different story...
Thanks for your help,
Tomas
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