[PATCH 0/2] mediatek: filogic: update GatoNetworks GDSP support

[Enrico Mioso]

Enable TF card reader, reorganizing things as follows:
1 - Create three DTS overlays: the "default" one (selected by U-Boot)
allowing GPS access via /dev/ttyS1, a second one allowing access to the
MMC controller (which shares some PINs with the UART) and a third that
permits booting from an SD card.
2 - Adapt U-Boot support accordingly: it now offers a boot firmware media
feature, allowing to switch easily from NOR to SD booting and back.
Note that the device will always boot BL2 + BL31+U-Boot from NOR; U-Boot
environment remains there as well.

Why this cover letter
---------------------

To explain the reasons behind some choices I've made.

a - I introduced a new "Build/simplefit" recipe in
target/linux/mediatek/image/filogic.mk since I needed a simpler partition
scheme. Infact, here I am storing only the firmware, and not all of the
rest used by Mediatek devices when booting from SD card (BL2 + BL31...).
b - In boot media selection logic, I preferred to use patterns like:

if test ...; then do_something; else if test ...; then do_something_different; fi; fi

rather than

if test ...; then do_something; else do_something_else; fi

to make it easier to extend things, for me or someone who may find
themlselves in the need to implement something similar but with more
firmware loading options.
c - Choosing to create three overlays instead of two (leaving GPS UART
access possible in the base DTS) makes it necessary to upgrade U-Boot if
sysupgrading past this commit. Still, I deviced to go this way because
it seemed more elegant.

Enrico Mioso (2):
  mediatek: filogic: add SD card support to GatoNetworks GDSP
  uboot-mediatek: GatoNetworks GDSP support fixes and updates

 .../patches/458-add-GatoNetworks-GDSP.patch   | 83 +++++++++++++++----
 .../dts/mt7981b-gatonetworks-gdsp-gps.dtso    | 15 ++++
 .../mt7981b-gatonetworks-gdsp-sd-boot.dtso    | 30 +++++++
 .../dts/mt7981b-gatonetworks-gdsp-sd.dtso     | 15 ++++
 .../dts/mt7981b-gatonetworks-gdsp.dts         | 69 ++++++++++++++-
 .../base-files/lib/upgrade/platform.sh        |  3 +-
 target/linux/mediatek/image/filogic.mk        | 20 ++++-
 7 files changed, 214 insertions(+), 21 deletions(-)
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso

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2.49.0