Kever,
On 13 Feb 2018, at 09:04, Kever Yang kever.yang@rock-chips.com wrote:
Simon,
On 02/12/2018 10:35 PM, Simon Glass wrote:
Hi Kever,
On 4 February 2018 at 18:00, Kever Yang kever.yang@rock-chips.com wrote:
On 02/04/2018 09:40 PM, Simon Glass wrote:
Hi Kever,
On 4 February 2018 at 00:44, Kever Yang kever.yang@rock-chips.com wrote:
Hi Simon, Philipp,
When I try to convert to live dt, I fount there are many APIs work in fdt are missing in live dt,
do you have any suggestion to add these APIs in live dt quickly? I need:
fdtdec_get_addr_size_auto_noparent
dev_read_addr_size() - not having a parent doesn't happen with livetree
fdt_alloc_phandle
We don't support changing the live tree yet.
fdt_device_is_available
dev_read_enabled()
fdt_for_each_subnode
dev_for_each_subnode()
fdt_getprop
dev_read_prop()
fdt_getprop_u32_default_node
This is an odd function. Can you first check that the property exists, and then use a dev_read_...() function to read it?
fdt_get_named_resource
dev_read_resource_byname()
fdt_get_name
dev_read_name() - although I see that the comment is wrong
fdt_get_path
Not available but you can add it
fdt_get_phandle
Why do you need this?
Most of the APIs are used in this file or other files in this folder, https://github.com/rockchip-linux/u-boot/blob/release/drivers/video/drm/rock... It needs to handle quite complicated dts node for display system in rockchip drm display driver(not upstream yet): https://github.com/rockchip-linux/u-boot/blob/release/arch/arm/dts/rk3128.dt... https://github.com/rockchip-linux/u-boot/blob/release/arch/arm/dts/rk3126-bn...
One difference I see with Linux is that U-Boot creates devices for all nodes automatically, provided that they have a compatible string and matching driver. This should simplify things in U-Boot.
The supernode-at-depth function looks like it just takes the parent of the parent when an argument of -2 is used.
The existing rockchip driver in U-Boot handles a similar binding, doesn't it? It has phandles and multiple nodes and subnodes.
Yes, but it does not able to migrate to support both live dt and fdt, because there is no same api in live dt, and here is what I do locally for live dt: 823 phandle = ofnode_read_u32_default(node, "connect", -1); 824 if (phandle < 0) { 825 printf("Warn: can't find connect node's handle\n"); 826 continue; 827 } 828 ep_node = of_find_node_by_phandle(phandle); 829 if (!ofnode_valid(np_to_ofnode(ep_node))) { 830 printf("Warn: can't find endpoint node from phandle\n"); 831 continue; 832 } 833 port_node = of_get_parent(ep_node); 834 if (!ofnode_valid(np_to_ofnode(port_node))) { 835 printf("Warn: can't find port node from phandle\n"); 836 continue; 837 } 838 vop_node = of_get_parent(port_node); 839 if (!ofnode_valid(np_to_ofnode(vop_node))) { 840 printf("Warn: can't find crtc node from phandle\n"); 841 continue; 842 } 843 ret = uclass_get_device_by_ofnode(UCLASS_VIDEO_CRTC, 844 np_to_ofnode(vop_node), 845 &crtc_dev);
In usb phy, we have similar requirement, but only need find "-1" depth parent.
Can you use dev_get_parent() to get the parent and then use dev_read_*() on the parent?
Thanks,
- Kever
Thanks,
- Kever
fdt_node_depth fdt_node_offset_by_phandle fdt_node_offset_by_phandle_node
uclass_get_device_by_phandle() or similar?
fdt_path_offset
ofnode_path() although it does not return a device. Best avoided.
fdt_set_phandle
You can't change the livtree at present.
fdt_stringlist_get
dev_read_string_index()
fdt_stringlist_search
dev_read_stringlist_search()
fdt_subnode_offset
Why do you want that?
fdt_supernode_atdepth_offset
This should be found by scanning, generally using separate drivers for each DT node.
If you like you could send a patch with the info above, to doc/driver-model/livetree.txt to help others.
Regards, Simon