On 01/07/2022 10:06, Marek Vasut wrote: > In the local patch I have to imx8mp.dtsi , the simple-mfd had to be > added for the ldb bridge child node to bind. > >> 'simple-mfd' is saying the child has 0 dependence on the parent. IMO, >> 'syscon' contradicts that, but that's an all to common pattern. You are >> saying all the clocks (or any other resources) in the parent can be off >> and the LDB bridge is still functional. > > The bridge itself should work even if the block control is clocked off. > The block controller apb (register) clock have to be enabled only when > accessing these two LDB registers, which should be handled by runtime > PM. Or what am I missing here ? If I understand correctly, you need the device's APB clocks to be enabled to use the child device? You have a dependency between child and parent, so it is not a simple-mfd. Best regards, Krzysztof
