于 2017年9月28日 GMT+08:00 下午11:11:03, Maxime Ripard <[email protected]> 写到: >Hi, > >On Thu, Sep 28, 2017 at 09:25:41AM +0000, Icenowy Zheng wrote: >> + /* >> + * The max-frequency properties in all MMC controller nodes >> + * are conservative values proven to work on Banana Pi M2 >> + * Ultra (the first community available R40 board). >> + * As the board doesn't wire MMC3 out, the property is not >> + * set in MMC3. >> + * TODO: measure the accurate max frequency of the controllers. >> + */ >> + mmc0: mmc@1c0f000 { >> + compatible = "allwinner,sun8i-r40-mmc", >> + "allwinner,sun50i-a64-mmc"; >> + reg = <0x01c0f000 0x1000>; >> + clocks = <&ccu CLK_BUS_MMC0>, <&ccu CLK_MMC0>; >> + clock-names = "ahb", "mmc"; >> + resets = <&ccu RST_BUS_MMC0>; >> + reset-names = "ahb"; >> + pinctrl-0 = <&mmc0_pins>; >> + pinctrl-names = "default"; >> + interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>; >> + max-frequency = <25000000>; >> + status = "disabled"; >> + #address-cells = <1>; >> + #size-cells = <0>; >> + }; > >Sorry if it wasn't really clear, but my point was more than you should >just drop the max-frequency property
Then set it in the boards' DTS? > >Maxime
