[U-Boot] [PATCH v2 0/7] Align U-Boot I2C DM bus ID handling with Linux
Heiko Schocher
hs at denx.de
Mon Feb 11 06:20:58 UTC 2019
Hello Michal,
Am 08.02.2019 um 12:24 schrieb Michal Simek:
> On 08. 02. 19 12:14, Michal Simek wrote:
>> On 08. 02. 19 10:57, Heiko Schocher wrote:
>>> Hello Michael,
>>>
>>> Am 31.01.2019 um 16:30 schrieb Michal Simek:
>>>> U-Boot with I2C_DM enabled is not capable to list i2c busses connected
>>>> to i2c mux. For getting this work there is a need to find out highest
>>>> alias ID and use this uniq number for new buses connected to I2C mux.
>>>> This series is making this happen.
>>>>
>>>> There is only one missing piece which is that also i2c controllers which
>>>> are not listed in DT are not using this feature.
>>>>
>>>> Removing setting up aliases from i2c mux code and unifying it in the
>>>> same code ensures that numbering schema is proper if no alias is
>>>> specified.
>>>>
>>>> ZynqMP> i2c bus
>>>> Bus 0: i2c at ff020000
>>>> 20: gpio at 20, offset len 1, flags 0
>>>> 21: gpio at 21, offset len 1, flags 0
>>>> 75: i2c-mux at 75, offset len 1, flags 0
>>>> Bus 1: i2c at ff020000->i2c-mux at 75->i2c at 0
>>>> Bus 2: i2c at ff020000->i2c-mux at 75->i2c at 1
>>>> Bus 3: i2c at ff020000->i2c-mux at 75->i2c at 2
>>>> Bus 4: i2c at ff030000 (active 4)
>>>> 74: i2c-mux at 74, offset len 1, flags 0
>>>> 75: i2c-mux at 75, offset len 1, flags 0
>>>> Bus 5: i2c at ff030000->i2c-mux at 74->i2c at 0 (active 5)
>>>> 54: eeprom at 54, offset len 1, flags 0
>>>> Bus 6: i2c at ff030000->i2c-mux at 74->i2c at 1
>>>> Bus 7: i2c at ff030000->i2c-mux at 74->i2c at 2
>>>> Bus 8: i2c at ff030000->i2c-mux at 74->i2c at 3
>>>> Bus 9: i2c at ff030000->i2c-mux at 74->i2c at 4
>>>> Bus 10: i2c at ff030000->i2c-mux at 75->i2c at 0
>>>> Bus 11: i2c at ff030000->i2c-mux at 75->i2c at 1
>>>> Bus 12: i2c at ff030000->i2c-mux at 75->i2c at 2
>>>> Bus 13: i2c at ff030000->i2c-mux at 75->i2c at 3
>>>> Bus 14: i2c at ff030000->i2c-mux at 75->i2c at 4
>>>> Bus 15: i2c at ff030000->i2c-mux at 75->i2c at 5
>>>> Bus 16: i2c at ff030000->i2c-mux at 75->i2c at 6
>>>> Bus 17: i2c at ff030000->i2c-mux at 75->i2c at 7
>>>>
>>>> Thanks,
>>>> Michal
>>>>
>>>> Changes in v2:
>>>> - Update kernel-doc binding
>>>> - Return -1 in case of error. -1 means that the next free alias is 0.
>>>> - New patch
>>>> - New patch
>>>> - Use dev_read_alias_highest_id()
>>>> - Use uclass private data
>>>> - Use private uclass data
>>>> - Fix headers
>>>> - Change patch description to focus only on bus name
>>>>
>>>> Michal Simek (7):
>>>> dm: core: Add of_alias_get_highest_id()
>>>> fdt: Introduce fdtdec_get_alias_highest_id()
>>>> dm: core: Introduce dev_read_alias_highest_id()
>>>> dm: core: Add tests for dev_read_alias_highest_id()
>>>> i2c: dm: Record maximum id of devices before probing devices
>>>> i2c: Fill req_seq in i2c_post_bind()
>>>> i2c: mux: Generate longer i2c mux name
>>>>
>>>> drivers/core/of_access.c | 18 ++++++++++++++
>>>> drivers/core/read.c | 8 ++++++
>>>> drivers/i2c/i2c-uclass.c | 50
>>>> +++++++++++++++++++++++++++++++++++---
>>>> drivers/i2c/muxes/i2c-mux-uclass.c | 29 +++++++++++++++++++---
>>>> include/dm/of_access.h | 10 ++++++++
>>>> include/dm/read.h | 16 ++++++++++++
>>>> include/fdtdec.h | 13 ++++++++++
>>>> lib/fdtdec.c | 33 +++++++++++++++++++++++++
>>>> test/dm/test-fdt.c | 23 ++++++++++++++++++
>>>> 9 files changed, 194 insertions(+), 6 deletions(-)
>>>>
>>>
>>> I just applied your patches and triggered a build on travis:
>>>
>>> It shows error for omap boards:
>>>
>>> https://travis-ci.org/hsdenx/u-boot-i2c/jobs/490393822
>>>
>>> I try to find time to look into it, but may you have time too?
>>>
>>
>> This should be the fix. (I tried that on omap35_logic_somlv_defconfig)
>>
>> diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
>> index 6f3fca2d2326..391fb1289983 100644
>> --- a/drivers/i2c/i2c-uclass.c
>> +++ b/drivers/i2c/i2c-uclass.c
>> @@ -655,8 +655,12 @@ int i2c_uclass_init(struct uclass *class)
>> if (!priv)
>> return -ENOMEM;
>>
>> +#if CONFIG_IS_ENABLED(OF_CONTROL)
>> /* Get the last allocated alias. */
>> priv->max_id = dev_read_alias_highest_id("i2c");
>> +#else
>> + priv->max_id = -1;
>> +#endif
>>
>> debug("%s: highest alias id is %d\n", __func__, priv->max_id);
>>
>>
>> SPL has no OF_CONTROL and also no LIBFDT that's why it is trying to call
>> it.
>
> :-) that sentence doesn't make sense. Correction:
> ...that's why it shouldn't be called.
;-)
> Maybe it should be enough to have dependency on OF_LIBFDT but Kconfig is
> saying that OF_LIBFDT is bool setup to y when OF_CONTROL is enabled.
> And in Makefile fdtdec is enabled
>
> obj-$(CONFIG_$(SPL_TPL_)OF_CONTROL) += fdtdec.o
> or just
> obj-$(CONFIG_OF_LIBFDT) += fdtdec.o
>
> Anyway it should be likely enough to have dependency just on OF_LIBFDT.
Ok, do you want to send a v3 of the patch:
dm: core: Add of_alias_get_highest_id()
or is it OK for you, if I add the above fix to this patch directly?
bye,
Heiko
--
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