On 01/21/2013 10:32 PM, Marek Vasut wrote: > Dear Michał Mirosław, > >> 2013/1/21 Marek Vasut <marex@xxxxxxx>: >>> Dear Michał Mirosław, >>> >>>> 2013/1/21 Marek Vasut <marex@xxxxxxx>: >>>>> This patch adds support for i.MX23 into the LRADC driver. The LRADC >>>>> block on MX23 is not much different from the one on MX28, thus this >>>>> is only a few changes fixing the parts that are specific to MX23. >>>> >>>> [...] >>>> >>>>> +struct mxs_lradc_of_config { >>>>> + const int irq_count; >>>>> + const char * const *irq_name; >>>>> +}; >>>>> + >>>>> +static const struct mxs_lradc_of_config const mxs_lradc_of_config[] = >>>>> { + [IMX23_LRADC] = { >>>>> + .irq_count = ARRAY_SIZE(mx23_lradc_irq_names), >>>>> + .irq_name = mx23_lradc_irq_names, >>>>> + }, >>>>> + [IMX28_LRADC] = { >>>>> + .irq_count = ARRAY_SIZE(mx28_lradc_irq_names), >>>>> + .irq_name = mx28_lradc_irq_names, >>>>> + }, >>>>> +}; >>>>> + >>>>> >>>>> enum mxs_lradc_ts { >>>>> >>>>> MXS_LRADC_TOUCHSCREEN_NONE = 0, >>>>> MXS_LRADC_TOUCHSCREEN_4WIRE, >>>>> >>>>> @@ -857,8 +890,19 @@ static void mxs_lradc_hw_stop(struct mxs_lradc >>>>> *lradc) >>>>> >>>>> writel(0, lradc->base + LRADC_DELAY(i)); >>>>> >>>>> } >>>>> >>>>> +static const struct of_device_id mxs_lradc_dt_ids[] = { >>>>> + { .compatible = "fsl,imx23-lradc", .data = (void >>>>> *)IMX23_LRADC, }, + { .compatible = "fsl,imx28-lradc", .data = >>>>> (void >>>>> *)IMX28_LRADC, }, + { /* sentinel */ } >>>>> +}; >>>>> +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); >>>>> + >>>> >>>> Why not s/(void \*)\(IMX.._LRADC\)/\&mxs_lradc_of_config[\1]/ ? >>> >>> Check the register layout, it differs between MX23 and MX28, that's one >>> reason, since were we to access differently placed registers, we can do >>> it easily as in the SSP/I2C drivers. >>> >>> Moreover, there are some features on the MX28 that are not on the MX23 >>> (like voltage treshold triggers and touchbuttons), with this setup, we >>> can easily check what we're running at at runtime and determine to >>> disallow these. >>> >>> From my point of view, using the number (IMX23_LRADC / IMX28_LRADC) is >>> much more convenient in the long run. >> >> I'm asking, because you don't use this number anywhere other than in >> mxs_lradc_probe() >> and there only to dereference the irq-names table. After that the >> structure and number >> are forgotten. > > Certainly, so far it's used only this way. But please see my argument about > register layout, that's why I went down this road of abstraction. You'll probably be better of by putting these differences into the mxs_lradc_of_config struct as well, instead of adding switch statements here and there throughout the code. - Lars -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html