[PATCH v2 1/5] cmd: bind: allow to bind driver with driver data

[Simon Glass]

On Wed, 29 Apr 2020 at 06:20, Patrice Chotard <patrice.chotard at st.com> wrote:
>
> Initial implementation invokes device_bind_with_driver_data()
> with driver_data parameter equal to 0.
> For driver with driver data, the bind command can't bind
> correctly this driver or even worse causes data abort as shown below:
>
> As example, for debug purpose on STM32MP1 platform, ethernet (dwc_eth_qos.c)
> driver needed to be unbinded/binded. This driver is using driver data:
>
> static const struct udevice_id eqos_ids[] = {
>     {
>         .compatible = "nvidia,tegra186-eqos",
>         .data = (ulong)&eqos_tegra186_config
>     },
>     {
>         .compatible = "snps,dwmac-4.20a",
>         .data = (ulong)&eqos_stm32_config
>     },
>
>     { }
> };
>
> After unbinding/binding this driver and probing it (with the dhcp command),
> we got a prefetch abort as below:
>
> STM32MP> unbind eth ethernet at 5800a000
> STM32MP> bind /soc/ethernet at 5800a000 eth_eqos
> STM32MP> dhcp
> prefetch abort
> pc : [<4310801c>]          lr : [<ffc8f4ad>]
> reloc pc : [<035ba01c>]    lr : [<c01414ad>]
> sp : fdaf19b0  ip : ffcea83c     fp : 00000001
> r10: ffcfd4a0  r9 : fdaffed0     r8 : 00000000
> r7 : ffcff304  r6 : fdc63220     r5 : 00000000  r4 : fdc5b108
> r3 : 43108020  r2 : 00003d39     r1 : ffcea544  r0 : fdc63220
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> Code: data abort
> pc : [<ffc4f9c0>]          lr : [<ffc4f9ad>]
> reloc pc : [<c01019c0>]    lr : [<c01019ad>]
> sp : fdaf18b8  ip : 00000000     fp : 00000001
> r10: ffcd69b2  r9 : fdaffed0     r8 : ffcd69aa
> r7 : 00000000  r6 : 00000008     r5 : 4310801c  r4 : fffffffc
> r3 : 00000001  r2 : 00000028     r1 : 00000000  r0 : 00000006
> Flags: NzCv  IRQs on  FIQs on  Mode SVC_32 (T)
> Code: 2f00 d1e9 2c00 dce9 (f855) 2024
> Resetting CPU ...
>
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
> Cc: Jean-Jacques Hiblot <jjhiblot at ti.com>
>
> ---
>
> Changes in v2:
>    - add a bind command test
>    - add bind command documentation in doc/driver/model/bind.rst
>    - simplify patch 1 by using lists_bind_fdt()
>
>  cmd/bind.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Reviewed-by: Simon Glass <sjg at chromium.org>