On Wed, 2015-05-13 at 12:10 +0100, Mark Brown wrote: > On Wed, May 13, 2015 at 05:26:06PM +0800, Yingjoe Chen wrote: > > On Tue, 2015-05-12 at 17:05 +0100, Mark Brown wrote: > > > > > > There were three compatible strings listed in the DT binding but only > > > > > two here. > > > > > And I test it's ok on MT8135 platform. So I add struct of_device_id > > > > mtk_spi_of_match like this in spi driver code. > > > > You should list all the compatibles documented in the binding here, if > > > some of them are the same just have them map to a single constant. > > > Just for clarification. If we want to add spi support for a new soc, say > > mt8127, which we think is compatible to mt6589. Since it may turn out we > > need special handling for this soc latter, it is suggested to write > > compatible like this in mt8127.dtsi: > > > compatible = "mediatek,mt8127-spi", > > "mediatek,mt6589-spi"; > > > Device tree binding should list all possible compatible string in .dts, > > so we'll have to add that to binding as well. > > > - mediatek,mt6589-spi: for mt6589 platforms > > + - mediatek,mt8127-spi: for mt8127 platforms > > > Then we'll also need to add this to source code to reflect this. > > > { .compatible = "mediatek,mt6589-spi", .data = (void *)COMPAT_MT6589}, > > + { .compatible = "mediatek,mt8127-spi", .data = (void *)COMPAT_MT6589}, > > > This seems to introduce lots of trivial patches just to add a compatible > > device to me... > > Yes, but that's how DT works and as you say these patches are all > trivial so it's not like they take any appreciable effort. Yes, that's shouldn't be a big effort. Thanks for clarification. Joe.C -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html