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. > Sure, it's just an insn or two, so no strong opinion here --- just curious. I tried to put it down above ;-) > Best Regards, > Michał Mirosław Best regards, Marek Vasut -- 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