[PATCH u-boot 0/3] renesas: Fix RPC-IF enablement

[Geert Uytterhoeven]

On Tue, Mar 29, 2022 at 2:19 PM Geert Uytterhoeven
<geert+renesas at glider.be> wrote:
> On Renesas R-Car Gen3 platforms, the SPI Multi I/O Bus Controllers
> (RPC-IF) provide access to HyperFlash or QSPI storage.  On production
> systems, they are typically locked by the TF-A firmware, unless TF-A is
> built with RCAR_RPC_HYPERFLASH_LOCKED=0.  When unlocked, TF-A
> communicates this to subsequent software by passing a DT fragment that
> sets the "status" property of the RPC-IF device node to "okay".
>
> Unfortunately there are several issues preventing this from working all
> the way to Linux:
>   1. TF-A (and U-Boot on the receiving side) uses a device node name
>      that does not conform to the DT specification nor the DT bindings
>      for RPC-IF,
>   2. While U-Boot receives the RPC-IF enablement from TF-A, it does not
>      propagate it to Linux yet,
>   3. The DTS files that are part of Linux do not have RPC HyperFlash
>      support yet.
>
> The first issue in TF-A is handled by [1].
>
> This patch series takes care of the first and second issue in U-Boot, by
> renaming the RPC-IF device node, and by propagating the enablement from
> TF-A, if present, to Linux.  The third patch updates the RPC-IF
> compatible values to match the actual DT bindings, but this is not
> critical for operation, and can be postponed (e.g. by syncing DTS with
> Linux v5.19).
>
> Patches to enable RPC-IF support in Linux are available at [2].

The patches to enable RPC HyperFlash support in Linux are now in
v5.19-rc1.  What needs to be done to accept the U-Boot counterpart?

Thanks!

>
> Thanks for your comments!
>
> [1] "[PATCH TF-A] fix(plat/rcar3): Fix RPC-IF device node name"
>     https://lore.kernel.org/r/3685623bed84674039adb61e723288d359ab0a50.1648544199.git.geert+renesas@glider.be
> [2] "[PATCH 0/5] arm64: dts: renesas: rcar-gen3: Enable HyperFlash support"
>     https://lore.kernel.org/r/cover.1648548339.git.geert+renesas@glider.be
>
> Geert Uytterhoeven (3):
>   ARM: dts: rmobile: Fix RPC-IF device node names
>   ARM: renesas: Propagate RPC-IF enablement to subsequent software
>   [RFC] renesas: Fix RPC-IF compatible values
>
>  arch/arm/dts/r7s72100-gr-peach-u-boot.dts |  4 +-
>  arch/arm/dts/r8a774c0-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77950-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77960-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77965-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77970-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77980-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77990-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a77995-u-boot.dtsi         |  4 +-
>  arch/arm/dts/r8a779a0-u-boot.dtsi         |  2 +-
>  board/renesas/rcar-common/common.c        | 46 ++++++++++++++++++++++-
>  drivers/mtd/renesas_rpc_hf.c              |  3 +-
>  drivers/spi/renesas_rpc_spi.c             |  9 +----
>  13 files changed, 67 insertions(+), 29 deletions(-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds