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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, May 17, 2024 at 06:13:21PM +0100, Conor Dooley wrote: > On Fri, May 17, 2024 at 01:10:05PM -0400, Frank Li wrote: > > On Fri, May 17, 2024 at 05:21:32PM +0100, Conor Dooley wrote: > > > On Thu, May 16, 2024 at 11:56:27PM -0400, Frank Li wrote: > > > > > > > Look like it is easy to register auxdev "reset" devices. But I have a > > > > problem. How to use it by DT phandle? "reset" devices is service provider. > > > > Some client will use it. > > > > > > > > Generally, reset node will used by other devices nodes. like > > > > > > > > ABC: reset { > > > > compatible="simple-reset"; > > > > ... > > > > } > > > > > > > > other node will use "reset = <&ABC 0>". If use auxdev, how to get &ABC > > > > in dts file. > > > > > > Whether or not you use auxdev or any other method etc, does not matter > > > in a DT system, the consumer will always have a phandle to the provider > > > node: > > > > > > ABC: whatever { > > > compatible = "whatever"; > > > #clock-cells = <...>; > > > #reset-cells = <...>; > > > } > > > > > > something-else { > > > clocks = <&ABC ...>; > > > resets = <&ABC ...>; > > > } > > > > > > It goes back to old problem, "reset-cells" will be in "clock-controller". > > > > clock-controller@30e20000 { > > compatible = "fsl,imx8mp-audio-blk-ctrl", "syscon", "simple-mfd"; > > reg = <0x30e20000 0x10000>; > > ... > > > > #reset-cells = <...>; > > ^^^ > > }; > > > > If create new "whatever" auxdev bus driver which included two aux devices, > > (clock and reset). > > > > it will be similar with mfd. Still need change > > clock-controller@30e20000 drivers. > > > > "Which is I suspect is gonna require a change to your clock driver, > > because the range in the existing clock nodes: > > audio_blk_ctrl: clock-controller@30e20000 { > > compatible = "fsl,imx8mp-audio-blk-ctrl"; > > reg = <0x30e20000 0x10000>; > > }; > > would then have to move to the mfd parent node, and your clock child > > would have a reg property that overlaps the reset region. You'd need to > > then define a new binding that splits the range in two - obviously > > doable, but significantly more work and more disruptive than using an > > auxdev." > > > > So I don't know why auxdev will be better than mfd. > > I think Stephen and I have spent enough time trying to explain why using > auxdev is beneficial here. I, at least, won't be wasting any more of my > (metaphorical) breath. Thanks for your time. After I did more rearch, especially read your previous patch: https://lore.kernel.org/linux-clk/20240424-strangle-sharpener-34755c5e6e3e@spud/ I have better view about auxdev. Frank > > > A possible benefit may be that Auxdev needn't binding doc for clock and > > reset node devices. > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel