Re: [PATCH v2 04/18] arm64: dts: m3ulcb-kf: initial device tree

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Hi Simon, Geert,

Do you need extra actions from my side to accept this patch?

On 20.09.2017 15:32, Geert Uytterhoeven wrote:
Hi Vladimir,

[CC Pantelis]

On Thu, Sep 14, 2017 at 4:18 PM, Vladimir Barinov
<vladimir.barinov@xxxxxxxxxxxxxxxxxx> wrote:
Add the initial device tree for the M3ULCB with Kingfisher extension
infotainment board.

Signed-off-by: Vladimir Barinov <vladimir.barinov@xxxxxxxxxxxxxxxxxx>
---
Changes in version 2:
- added own compatible value "shimafuji,kingfisher"
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

Some food for thought below...

--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a7796-m3ulcb-kf.dts
@@ -0,0 +1,19 @@
+/*
+ * Device Tree Source for the M3ULCB Kingfisher board
+ *
+ * Copyright (C) 2017 Renesas Electronics Corp.
+ * Copyright (C) 2017 Cogent Embedded, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include "r8a7796-m3ulcb.dts"
Ideally, we don't include *.dts files, only *.dtsi.
But I don't see a better immediate solution.

+#include "ulcb-kf.dtsi"
As the Kingfisher is actually an expansion board for H3ULCB (with R-Car H3
ES1.1 and ES2.0) and M3ULCB (with R-Car M3-W), turning ulcb-kf.dtsi into a
DT overlay would make sense.
That would also solve the issue of the 3 extra DTSes needed for all possible
combinations of ULCB and Kingfisher (r8a7795-es1-h3ulcb-kf.dts,
r8a7795-h3ulcb-kf.dts, r8a7796-h3ulcb-kf.dts (perhaps more to follow?)).

But that's too premature, without upstream support for the easy loading of
DT overlays.

+/ {
+       model = "Renesas M3ULCB Kingfisher board based on r8a7796";
+       compatible = "shimafuji,kingfisher", "renesas,m3ulcb",
+                    "renesas,r8a7796";
+};
And how to support from an overlay the addition of "shimafuji,kingfisher" to
(not replacement of!) the main compatible value?

Gr{oetje,eeting}s,

                         Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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


--
Regards,
Vladimir

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