On Tue, Sep 23, 2008 at 02:43:18PM +0200, [EMAIL PROTECTED] wrote: > Hi guys > > I'm using a lite5200b EVB (u-boot 1.2, kernel 2.6.26.3), using the psc-spi > driver and the mmc-spi driver. > > I've modified the lite5200b.dts file, I'd have SPI on PSC6 and mmc_spi > connected to SPI on PSC6 > > and then uncommented > > // PSC6 in spi mode example > [EMAIL PROTECTED] { // PSC6 > compatible = > "fsl,mpc5200b-psc-spi","fsl,mpc5200-psc-spi"; > cell-index = <5>; > reg = <0x2c00 0x100>; > interrupts = <2 4 0>; > interrupt-parent = <&mpc5200_pic>; > [EMAIL PROTECTED] { > linux,modalias = "mmc_spi"; > }; > }; > > I've also added a node to [EMAIL PROTECTED] (I'm not sure about last change). > > My question are: > a) Is this the right way to insert a node in device tree (in this example for > mmc-spi) or there are an other way to pass the information to mmc-spi that > SPI is on PSC6?
Yes, this is mostly right. However, you need to add 2 properties to your PSC6 [EMAIL PROTECTED] node; '#address-cells = <1>;' and '#size-cells = <0>;' These are needed so that the device tree code knows how to interpret the address of the child node. For the [EMAIL PROTECTED] node, you need to remove the linux,modalias property. That method of describing the device is strongly discouraged. Instead, add a property 'compatible = "mmc-spi";' and 'reg = <0>;'. Compatible is the property used to bind to the device and reg gives the device address (which is 0 since you only have one device wired to the SPI bus). Unfortunately, you'll need to hack around a bit with binding code. Support for MMC devices described in the device tree has not yet been merged, so some of this stuff is up in the air. However, as long as you get the device tree description correct now you should be insulated from changes in this area. Take a look at this thread for more details: http://www.mail-archive.com/linuxppc-dev@ozlabs.org/msg18836.html > > b) Why in /proc/devices I do not see any spi device (mpc5200b-psc-spi) or > something like that? > Adding some printk I have: > Fun = mpc52xx_psc_spi_init Ret = 0 > Is my of_register_platform_driver was ok. Poke around in /sys/bus/of_platform/devices/. See if anything shows up there. > > c) BTW a Block device mmc in /proc/devices is added (not mmc-spi as I'm > waiting), if I try to create a node and then write on device nothing happens. > > Any suggestion? > > Thanks J > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-dev _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev