On Thursday 05 December 2013, dinguyen@xxxxxxxxxx wrote: > From: Dinh Nguyen <dinguyen@xxxxxxxxxx> > > Re-use the "rockchip,rk2928-dw-mshc" binding that will support SD/MMC on > Altera's SOCFPGA platform. > > Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx> > --- > v3: Re-use "rockchip,rk2928-dw-mshc" binding > v3: none > v2: none > --- > arch/arm/boot/dts/socfpga.dtsi | 11 +++++++++++ > arch/arm/boot/dts/socfpga_arria5.dtsi | 12 ++++++++++++ > arch/arm/boot/dts/socfpga_cyclone5.dtsi | 12 ++++++++++++ > arch/arm/boot/dts/socfpga_vt.dts | 12 ++++++++++++ > 4 files changed, 47 insertions(+) > > diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi > index f936476..3d9f01b 100644 > --- a/arch/arm/boot/dts/socfpga.dtsi > +++ b/arch/arm/boot/dts/socfpga.dtsi > @@ -469,6 +469,17 @@ > cache-level = <2>; > }; > > + mmc: dwmmc0@ff704000 { > + compatible = "rockchip,rk2928-dw-mshc"; > + reg = <0xff704000 0x1000>; > + interrupts = <0 139 4>; > + fifo-depth = <0x400>; > + #address-cells = <1>; > + #size-cells = <0>; > + clocks = <&l4_mp_clk>, <&sdmmc_clk>; > + clock-names = "biu", "ciu"; > + }; I think it's great that you can reuse the existing driver, but I'd recommend using a generic compatible string here in addition to one that identifies your specific implementation. You can list "rockchip,rk2928-dw-mshc" as well, but that is probably not necessary. What I'd expect to see here is either compatible = "altr,socfpga-dw-mshc", "rockchip,rk2928-dw-mshc", "snps,dw-mshc"; or compatible = "altr,socfpga-dw-mshc", "rockchip,rk2928-dw-mshc", "snps,dw-mshc"; It's probably not too late to generalize the SDMMC_CMD_USE_HOLD_REG handling, which is currently the only difference between the generic "snps,dw-mshc" and the newer "rockchip,rk2928-dw-mshc" variant. It's quite likely that all implementations should actually set SDMMC_CMD_USE_HOLD_REG (if both rockchips and altera set it) and you don't need to have any distinction in the dw_mmc-pltfm.c driver at all. If it's actually needed on some but not others, you could add a binary DT property to tell the driver about it rather than keying it off of the compatible string. If it's needed only on older (or only on newer) versions of the dw-mshc design, it could be encoded as a version in the string, such as "snps,dw-mshc-1.234". Arnd -- 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