Hi Paul,
I didn't get patch #2, so I don't get to see how the read/write functions ar
eused for example.
On Thu, Feb 09, 2012 at 04:51:25AM +0800, Ying-Chun Liu (PaulLiu) wrote:
> From: "Ying-Chun Liu (PaulLiu)" <paul....@linaro.org>
>
> Anatop is a mfd chip embedded in Freescale i.MX6Q SoC.
> Anatop provides regulators and thermal.
> This driver handles the address space and the operation of the mfd device.
A few comments here:
> +static u32 anatop_read(struct anatop *adata, u32 addr, int bit_shift, int
> bits)
> +{
> + u32 val;
> + int mask;
> + if (bits == 32)
> + mask = 0xff;
> + else
> + mask = (1 << bits) - 1;
> +
> + val = ioread32(adata->ioreg+addr);
> + val = (val >> bit_shift) & mask;
> + return val;
> +}
> +
> +static void anatop_write(struct anatop *adata, u32 addr, int bit_shift,
> + int bits, u32 data)
> +{
> + u32 val;
> + int mask;
> + if (bits == 32)
> + mask = 0xff;
> + else
> + mask = (1 << bits) - 1;
> +
> + val = ioread32(adata->ioreg+addr) & ~(mask << bit_shift);
> + iowrite32((data << bit_shift) | val, adata->ioreg);
> +}
Don't you need some sort of read/write atomic routine as well ? Locking would
be needed then...
> +static const struct of_device_id of_anatop_regulator_match[] = {
> + {
> + .compatible = "fsl,anatop-regulator",
> + },
> + {
> + .compatible = "fsl,anatop-thermal",
> + },
> + { },
> +};
> +
> +static int of_anatop_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + u64 ofaddr;
> + u64 ofsize;
> + void *ioreg;
> + struct anatop *drvdata;
> + int ret = 0;
> + const __be32 *rval;
> +
> + rval = of_get_address(np, 0, &ofsize, NULL);
> + if (rval)
> + ofaddr = be32_to_cpu(*rval);
> + else
> + return -EINVAL;
> +
> + ioreg = ioremap(ofaddr, ofsize);
> + if (!ioreg)
> + return -EINVAL;
> + drvdata = devm_kzalloc(dev, sizeof(struct anatop), GFP_KERNEL);
> + if (!drvdata)
> + return -EINVAL;
> + drvdata->ioreg = ioreg;
> + drvdata->read = anatop_read;
> + drvdata->write = anatop_write;
> + platform_set_drvdata(pdev, drvdata);
> + of_platform_bus_probe(np, of_anatop_regulator_match, dev);
> + return ret;
> +}
So it seems that your driver here does nothing but extending your device tree
definition. Correct me if I'm wrong, aren't you trying to fix a broken device
tree definition here ?
Cheers,
Samuel.
--
Intel Open Source Technology Centre
http://oss.intel.com/
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