Re: [Qemu-devel] [PATCH v4 5/6] hw/arm/sysbus-fdt: helpers for platform bus nodes addition

[Alexander Graf <agraf@suse.de>]

On 31.10.14 14:53, Eric Auger wrote:
> This new C module will be used by ARM machine files to generate
> platform bus node and their dynamic sysbus device tree nodes.
> 
> Dynamic sysbus device node addition is done in a machine init
> done notifier. arm_register_platform_bus_fdt_creator does the
> registration of this latter and is supposed to be called by
> ARM machine files that support platform bus and their dynamic
> sysbus. Addition of dynamic sysbus nodes is done only if the
> user did not provide any dtb.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> Signed-off-by: Eric Auger <eric.auger@linaro.org>
> 
> ---
> 
> v3 -> v4:
> - dyn_sysbus_devtree.c renamed into sysbus-fdt.c
> - use new PlatformBusDevice object
> - the dtb upgrade is done through modify_dtb. Before the fdt
>   was recreated from scratch. When the user provided a dtb this
>   latter was overwritten which was not correct.
> - an array contains the association between device type names
>   and their node creation function
> - I must aknowledge I did not find any cleaner way to implement
>   a FDT_BUILDER interface, as suggested by Paolo. The class method
>   would need to be initialized somewhere and since it cannot
>   happen in the device itself - according to Alex & Peter comments -,
>   I don't see when I shall associate the device type and its
>   interface implementation.
> 
> v2 -> v3:
> - add arm_ prefix
> - arm_sysbus_device_create_devtree becomes static
> 
> v1 -> v2:
> - Code moved in an arch specific file to accomodate architecture
>   dependent specificities.
> - remove platform_bus_base from PlatformDevtreeData
> 
> v1: code originally written by Alex Graf in e500.c and reused for
> ARM [Eric Auger]
> ---
>  hw/arm/Makefile.objs        |   1 +
>  hw/arm/sysbus-fdt.c         | 181 ++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/arm/sysbus-fdt.h |  50 ++++++++++++
>  3 files changed, 232 insertions(+)
>  create mode 100644 hw/arm/sysbus-fdt.c
>  create mode 100644 include/hw/arm/sysbus-fdt.h
> 
> diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
> index 6088e53..0cc63e1 100644
> --- a/hw/arm/Makefile.objs
> +++ b/hw/arm/Makefile.objs
> @@ -3,6 +3,7 @@ obj-$(CONFIG_DIGIC) += digic_boards.o
>  obj-y += integratorcp.o kzm.o mainstone.o musicpal.o nseries.o
>  obj-y += omap_sx1.o palm.o realview.o spitz.o stellaris.o
>  obj-y += tosa.o versatilepb.o vexpress.o virt.o xilinx_zynq.o z2.o
> +obj-y += sysbus-fdt.o
>  
>  obj-y += armv7m.o exynos4210.o pxa2xx.o pxa2xx_gpio.o pxa2xx_pic.o
>  obj-$(CONFIG_DIGIC) += digic.o
> diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
> new file mode 100644
> index 0000000..d5476f1
> --- /dev/null
> +++ b/hw/arm/sysbus-fdt.c
> @@ -0,0 +1,181 @@
> +/*
> + * ARM Platform Bus device tree generation helpers
> + *
> + * Copyright (c) 2014 Linaro Limited
> + *
> + * Authors:
> + *  Alex Graf <agraf@suse.de>
> + *  Eric Auger <eric.auger@linaro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2 or later, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + *
> + */
> +
> +#include "hw/arm/sysbus-fdt.h"
> +#include "qemu/error-report.h"
> +#include "sysemu/device_tree.h"
> +#include "hw/platform-bus.h"
> +#include "sysemu/sysemu.h"
> +#include "hw/platform-bus.h"
> +
> +/*
> + * internal struct that contains the information to create dynamic
> + * sysbus device node
> + */
> +typedef struct PlatformBusFdtData {
> +    void *fdt; /* device tree handle */
> +    int irq_start; /* index of the first IRQ usable by platform bus devices */
> +    const char *pbus_node_name; /* name of the platform bus node */
> +    PlatformBusDevice *pbus;
> +} PlatformBusFdtData;
> +
> +/*
> + * struct used when calling the machine init done notifier
> + * that constructs the fdt nodes of platform bus devices
> + */
> +typedef struct PlatformBusFdtNotifierParams {
> +    ARMPlatformBusFdtParams *fdt_params;
> +    Notifier notifier;
> +} PlatformBusFdtNotifierParams;
> +
> +/* struct that associates a device type name and a node creation function */
> +typedef struct NodeCreationPair {
> +    const char *typename;
> +    int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
> +} NodeCreationPair;
> +
> +/* list of supported dynamic sysbus devices */
> +NodeCreationPair add_fdt_node_functions[] = {
> +        {"", NULL}, /*last element*/

s/    // :)


Alex