Re: driver using another driver

On Fri, Aug 01, 2014 at 07:15:41AM +0000, Priebe, Sebastian wrote:

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,
};

Why do you manually register a platform_device? You should add the CPLD
device to the device tree instead.

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?

In the fsl,weim-cs-timing property. See
Documentation/devicetree/bindings/bus/imx-weim.txt

Sascha

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