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
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-----Ursprüngliche Nachricht-----
Von: Sascha Hauer [mailto:s.hauer@xxxxxxxxxxxxxx]
Gesendet: Freitag, 1. August 2014 08:31
An: Priebe, Sebastian
Cc: devicetree@xxxxxxxxxxxxxxx
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
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