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

[Baruch Siach]

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?

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(-)


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