AW: driver using another driver

Hello Sascha,

thanks for your answer.
We are using an imx35 cpu and our CPLD is in fact connected via weim (CS1).
Though I created the following device node in our dts:
&weim {
        pinctrl-names = "default";
        status = "okay";

        pld@1,0 {
                compatible = "roche,hbm-pld";
                reg = <1 0x00000000 0x0001000>;
                fsl,weim-cs-timing = <0x0 0x0 0x0>; /* don't know what to put here */
        };
};

And I turned the CPLD driver into a platform driver. But I don't get the resource in probe:
res = platform_get_resource(pdev, IORESOURCE_MEM, 0) returns NULL.

In our platform code we had:
static struct resource hbm_pld_resource_data = {
        .start = 0xA8000000,
        .end = 0xA8000000 + 0x1000 - 1,
        .flags = IORESOURCE_MEM,
};

And for the setting of CS1:
__raw_writel((0x22 << 8), MX35_IO_ADDRESS(MX3x_WEIM_BASE_ADDR) + 0x10);
__raw_writel(((0x0a << 28) | (0x06 << 12) | (0x03 << 8) | (0x04 << 4) | (0x01 << 0)), MX35_IO_ADDRESS(MX3x_WEIM_BASE_ADDR) + 0x14);

Where do I put this in the device tree?

Gruß
Sebastian Priebe
Telefon: +49 (0)621 685996-26




==========================================
CADCON
Ingenieurgesellschaft mbH & Co. KG
Geschaeftsfuehrer: Robert Bauer, Andreas Gundel
Sitz der Gesellschaft: D-86368 Gersthofen
Registergericht: Amtsgericht Augsburg HRA 14521
==========================================

-----Ursprüngliche Nachricht-----
Von: Sascha Hauer [mailto:s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org]
Gesendet: Freitag, 1. August 2014 08:31
An: Priebe, Sebastian
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Betreff: Re: driver using another driver

Hi Sebastian,

On Wed, Jul 30, 2014 at 02:45:51PM +0000, Priebe, Sebastian wrote:

Hello,

I am working on a project with an ARMv6 cpu and I am currently trying
to port our board file to a device tree.  Our custom hardware has a
CPLD with is used by multiple driver.  In the past we shared the CPLD
driver resource (struct resource...) among the drivers platform data
to be able to access the CPLD registers from all the drivers.  The
CPLD driver allocated the resource, returned it to our platform code
and our platform code passed it to the other drivers.
In other words the CPLD driver is used by the other driver.
How can I achieve the same with a device tree?

You can use a toplevel device node for your CPLD on which your toplevel driver matches. Call of_platform_populate() with this toplevel node to create the child devices. drivers/bus/ contains some examples, like drivers/bus/imx-weim.c.

Sascha

--
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |


--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html