[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 06/31] dt: add helper for empty dt creation
From: |
Peter Crosthwaite |
Subject: |
Re: [Qemu-devel] [PATCH 06/31] dt: add helper for empty dt creation |
Date: |
Wed, 06 Jun 2012 15:34:23 +1000 |
On Wed, 2012-06-06 at 01:52 +0200, Alexander Graf wrote:
> We want to get rid of the concept of loading an external device tree and
> instead
> generate our own. However, to do this we need to also create a device tree
> template programatically.
>
> This patch adds a helper to create an empty device tree in memory.
>
> Signed-off-by: Alexander Graf <address@hidden>
Reviewed-by: Peter Crosthwaite <address@hidden>
> ---
> device_tree.c | 37 +++++++++++++++++++++++++++++++++++++
> device_tree.h | 1 +
> 2 files changed, 38 insertions(+), 0 deletions(-)
>
> diff --git a/device_tree.c b/device_tree.c
> index 6745d17..d4f1f0a 100644
> --- a/device_tree.c
> +++ b/device_tree.c
> @@ -25,6 +25,43 @@
>
> #include <libfdt.h>
>
> +#define FDT_MAX_SIZE 0x10000
> +
> +void *create_device_tree(int *sizep)
> +{
> + void *fdt;
> + int ret;
> +
> + *sizep = FDT_MAX_SIZE;
> + fdt = g_malloc0(FDT_MAX_SIZE);
> + ret = fdt_create(fdt, FDT_MAX_SIZE);
> + if (ret < 0) {
> + goto fail;
> + }
> + ret = fdt_begin_node(fdt, "");
> + if (ret < 0) {
> + goto fail;
> + }
> + ret = fdt_end_node(fdt);
> + if (ret < 0) {
> + goto fail;
> + }
> + ret = fdt_finish(fdt);
> + if (ret < 0) {
> + goto fail;
> + }
> + ret = fdt_open_into(fdt, fdt, *sizep);
> + if (ret) {
> + fprintf(stderr, "Unable to copy device tree in memory\n");
> + exit(1);
> + }
> +
> + return fdt;
> +fail:
> + fprintf(stderr, "%s Couldn't create dt: %s\n", __func__,
> fdt_strerror(ret));
> + exit(1);
> +}
> +
> void *load_device_tree(const char *filename_path, int *sizep)
> {
> int dt_size;
> diff --git a/device_tree.h b/device_tree.h
> index 376287a..5464dc7 100644
> --- a/device_tree.h
> +++ b/device_tree.h
> @@ -14,6 +14,7 @@
> #ifndef __DEVICE_TREE_H__
> #define __DEVICE_TREE_H__
>
> +void *create_device_tree(int *sizep);
> void *load_device_tree(const char *filename_path, int *sizep);
>
> int qemu_devtree_setprop(void *fdt, const char *node_path,
- [Qemu-devel] [PATCH 08/31] dt: add helper for 64bit cell adds, (continued)
- [Qemu-devel] [PATCH 08/31] dt: add helper for 64bit cell adds, Alexander Graf, 2012/06/05
- [Qemu-devel] [PATCH 26/31] PPC: e500: Use new MPIC dt format, Alexander Graf, 2012/06/05
- [Qemu-devel] [PATCH 04/31] dt: temporarily disable subtree creation failure check, Alexander Graf, 2012/06/05
- [Qemu-devel] [PATCH 01/31] dt: allow add_subnode to create root subnodes, Alexander Graf, 2012/06/05
- [Qemu-devel] [PATCH 06/31] dt: add helper for empty dt creation, Alexander Graf, 2012/06/05
- Re: [Qemu-devel] [PATCH 06/31] dt: add helper for empty dt creation,
Peter Crosthwaite <=
- Re: [Qemu-devel] [PATCH 00/31] PPC: mpc8544ds: Create device tree dynamically, Blue Swirl, 2012/06/07
- [Qemu-devel] [PATCH 00/31] PPC: mpc8544ds: Create device tree dynamically, Alexander Graf, 2012/06/19