lkml.org 
[lkml]   [2015]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173
    From
    Date
    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




    \
     
     \ /
      Last update: 2015-05-13 16:01    [W:3.859 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site