[RFC 0/7] mx6cuboxi: enable OF_PLATDATA with MMC support

[Walter Lozano]

Hi Baruch,

On 30/3/20 00:54, Baruch Siach wrote:
> Hi Walter,
>
> On Mon, Mar 30 2020, Walter Lozano wrote:
>> The SPL in iMX6 boards is restricted to 68 KB as this is the free available
>> space in OCRAM for most revisions. In this context, adding OF_CONTROL and DM
>> increases the SPL size which could make it difficult to add specific features
>> required for custom scenarios.
>>
>> These patches aim to take advantage of OF_PLATADATA in order to reduce the SPL
>> size in this scenario, by parsing DT data to generate platdata structures,
>> and thus removing the overhead caused by DT and related libraries.
>>
>> This series is focused in MMC driver, which is used for boot in boards such as
>> Cubox-i. Also, in order to support CD, the OF_PLATDATA support is also
>> implemented on GPIO driver.
>>
>> To make possible to link the CD information found in platdata with a GPIO,
>> a new API is suggested, to find/get a device based on its platdata. This
>> new API was discussed in [1] but the lack of context made the discussion
>> not to progress. With this series, the general idea should be clearer,
>> so a better solution could be discussed.
>>
>> Finally, in order to make use of these new features, enable OF_PLATADATA for
>> Cubox-i board, for which OF_CONTROL support is being discussed in [2].
> What is the net SPL size reduction of OF_PLATDATA in the Cubox-i case?

For the Cubox-i defconfig the reduction is 6 KB. Please take into 
account that this tries to reduce the impact of enabling OF_CONTROL and 
DM in SPL which increased the size by 12 KB, as described in [1]

Regards,

[1] https://patchwork.ozlabs.org/project/uboot/list/?series=163738


>
> Thanks,
> baruch
>
>> [1] https://patchwork.ozlabs.org/patch/1249198/
>> [2] https://patchwork.ozlabs.org/project/uboot/list/?series=163738
>>
>> Walter Lozano (7):
>>    mmc: fsl_esdhc_imx: add OF_PLATDATA support
>>    mmc: fsl_esdhc_imx: add ofdata_to_platdata support
>>    dtoc: update dtb_platdata to support cd-gpio
>>    dm: uclass: add functions to get device by platdata
>>    gpio: mxc_gpio: add OF_PLATDATA support
>>    mmc: fsl_esdhc_imx: add CD support when OF_PLATDATA is enabled
>>    mx6cuboxi: enable OF_PLATDATA
>>
>>   configs/mx6cuboxi_defconfig  |   2 +
>>   drivers/core/device.c        |  19 +++++++
>>   drivers/core/uclass.c        |  34 ++++++++++++
>>   drivers/gpio/mxc_gpio.c      |  27 ++++++++-
>>   drivers/mmc/fsl_esdhc_imx.c  | 105 ++++++++++++++++++++++++++++++-----
>>   include/dm/device.h          |  11 ++++
>>   include/dm/uclass-internal.h |  15 +++++
>>   include/dm/uclass.h          |  15 +++++
>>   tools/dtoc/dtb_platdata.py   |   9 ++-
>>   9 files changed, 218 insertions(+), 19 deletions(-)
>
> --
>       http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>     - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -