From: Simon Horman <horms+renesas@verge.net.au>
To: Mark Brown <broonie@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Magnus Damm <magnus.damm@gmail.com>,
linux-spi@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Simon Horman <horms+renesas@verge.net.au>
Subject: [PATCH spi/for-next] spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings
Date: Mon, 12 Dec 2016 10:49:35 +0100 [thread overview]
Message-ID: <1481536175-17238-1-git-send-email-horms+renesas@verge.net.au> (raw)
In the case of Renesas R-Car hardware we know that there are generations of
SoCs, e.g. Gen 2 and Gen 3. But beyond that it's not clear what the
relationship between IP blocks might be. For example, I believe that
r8a7790 is older than r8a7791 but that doesn't imply that the latter is a
descendant of the former or vice versa.
We can, however, by examining the documentation and behaviour of the
hardware at run-time observe that the current driver implementation appears
to be compatible with the IP blocks on SoCs within a given generation.
For the above reasons and convenience when enabling new SoCs a
per-generation fallback compatibility string scheme is being adopted for
drivers for Renesas SoCs.
Also:
* Deprecate renesas,sh-msiof. It seems poorly named as it is only
compatible with SH-Mobile. It also appears unused in mainline.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
Documentation/devicetree/bindings/spi/sh-msiof.txt | 19 +++++++++++++------
drivers/spi/spi-sh-msiof.c | 4 +++-
2 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/spi/sh-msiof.txt b/Documentation/devicetree/bindings/spi/sh-msiof.txt
index da6614c63796..dc975064fa27 100644
--- a/Documentation/devicetree/bindings/spi/sh-msiof.txt
+++ b/Documentation/devicetree/bindings/spi/sh-msiof.txt
@@ -1,17 +1,23 @@
Renesas MSIOF spi controller
Required properties:
-- compatible : "renesas,msiof-<soctype>" for SoCs,
- "renesas,sh-msiof" for SuperH, or
- "renesas,sh-mobile-msiof" for SH Mobile series.
- Examples with soctypes are:
- "renesas,msiof-r8a7790" (R-Car H2)
+- compatible : "renesas,msiof-r8a7790" (R-Car H2)
"renesas,msiof-r8a7791" (R-Car M2-W)
"renesas,msiof-r8a7792" (R-Car V2H)
"renesas,msiof-r8a7793" (R-Car M2-N)
"renesas,msiof-r8a7794" (R-Car E2)
"renesas,msiof-r8a7796" (R-Car M3-W)
"renesas,msiof-sh73a0" (SH-Mobile AG5)
+ "renesas,sh-mobile-msiof" (generic SH-Mobile compatibile device)
+ "renesas,rcar-gen2-msiof" (generic R-Car Gen2 compatible device)
+ "renesas,rcar-gen3-msiof" (generic R-Car Gen3 compatible device)
+ "renesas,sh-msiof" (deprecated)
+
+ When compatible with the generic version, nodes
+ must list the SoC-specific version corresponding
+ to the platform first followed by the generic
+ version.
+
- reg : A list of offsets and lengths of the register sets for
the device.
If only one register set is present, it is to be used
@@ -61,7 +67,8 @@ Documentation/devicetree/bindings/pinctrl/renesas,*.
Example:
msiof0: spi@e6e20000 {
- compatible = "renesas,msiof-r8a7791";
+ compatible = "renesas,msiof-r8a7791",
+ "renesas,rcar-gen2-msiof";
reg = <0 0xe6e20000 0 0x0064>;
interrupts = <0 156 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&mstp0_clks R8A7791_CLK_MSIOF0>;
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 0012ad02e569..471ca211b76c 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -973,14 +973,16 @@ static const struct sh_msiof_chipdata r8a779x_data = {
};
static const struct of_device_id sh_msiof_match[] = {
- { .compatible = "renesas,sh-msiof", .data = &sh_data },
{ .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
{ .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
{ .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
{ .compatible = "renesas,msiof-r8a7792", .data = &r8a779x_data },
{ .compatible = "renesas,msiof-r8a7793", .data = &r8a779x_data },
{ .compatible = "renesas,msiof-r8a7794", .data = &r8a779x_data },
+ { .compatible = "renesas,rcar-gen2-msiof", .data = &r8a779x_data },
{ .compatible = "renesas,msiof-r8a7796", .data = &r8a779x_data },
+ { .compatible = "renesas,rcar-gen3-msiof", .data = &r8a779x_data },
+ { .compatible = "renesas,sh-msiof", .data = &sh_data }, // Deprecated
{},
};
MODULE_DEVICE_TABLE(of, sh_msiof_match);
--
2.7.0.rc3.207.g0ac5344
next reply other threads:[~2016-12-12 9:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-12 9:49 Simon Horman [this message]
2016-12-13 13:51 ` [PATCH spi/for-next] spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings Geert Uytterhoeven
[not found] ` <1481536175-17238-1-git-send-email-horms+renesas-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>
2016-12-14 17:38 ` Mark Brown
[not found] ` <20161214173811.iporb5qqulmndvg3-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-12-20 10:21 ` Simon Horman
2016-12-14 18:03 ` Applied "spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings" to the spi tree Mark Brown
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