From: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
To: Brendan Higgins <brendanhiggins@google.com>,
Wolfram Sang <wsa@the-dreams.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Joel Stanley <joel@jms.id.au>, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Andrew Jeffery <andrew@aj.id.au>, Tao Ren <taoren@fb.com>,
Cedric Le Goater <clg@kaod.org>
Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org,
Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Subject: [PATCH v4 1/4] dt-bindings: i2c: aspeed: add transfer mode support
Date: Wed, 24 Feb 2021 11:17:17 -0800 [thread overview]
Message-ID: <20210224191720.7724-2-jae.hyun.yoo@linux.intel.com> (raw)
In-Reply-To: <20210224191720.7724-1-jae.hyun.yoo@linux.intel.com>
Append bindings to support transfer mode.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
---
Changes since v3:
- None
Changes since v2:
- Moved SRAM resources back to default dtsi and added mode selection
property.
Changes since v1:
- Removed buffer reg settings from default device tree and added the settings
into here to show the predefined buffer range per each bus.
.../devicetree/bindings/i2c/i2c-aspeed.txt | 37 +++++++++++++++----
1 file changed, 30 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
index b47f6ccb196a..242343177324 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
@@ -17,6 +17,20 @@ Optional Properties:
- bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not
specified
- multi-master : states that there is another master active on this bus.
+- aspeed,i2c-xfer-mode : should be "byte", "buf" or "dma" to select transfer
+ mode defaults to "byte" mode when not specified.
+
+ I2C DMA mode on AST2500 has these restrictions:
+ - If one of these controllers is enabled
+ * UHCI host controller
+ * MCTP controller
+ I2C has to use buffer mode or byte mode instead
+ since these controllers run only in DMA mode and
+ I2C is sharing the same DMA H/W with them.
+ - If one of these controllers uses DMA mode, I2C
+ can't use DMA mode
+ * SD/eMMC
+ * Port80 snoop
Example:
@@ -26,20 +40,29 @@ i2c {
#size-cells = <1>;
ranges = <0 0x1e78a000 0x1000>;
- i2c_ic: interrupt-controller@0 {
- #interrupt-cells = <1>;
- compatible = "aspeed,ast2400-i2c-ic";
+ i2c_gr: i2c-global-regs@0 {
+ compatible = "aspeed,ast2500-i2c-gr", "syscon";
reg = <0x0 0x40>;
- interrupts = <12>;
- interrupt-controller;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x0 0x40>;
+
+ i2c_ic: interrupt-controller@0 {
+ #interrupt-cells = <1>;
+ compatible = "aspeed,ast2500-i2c-ic";
+ reg = <0x0 0x4>;
+ interrupts = <12>;
+ interrupt-controller;
+ };
};
i2c0: i2c-bus@40 {
#address-cells = <1>;
#size-cells = <0>;
#interrupt-cells = <1>;
- reg = <0x40 0x40>;
- compatible = "aspeed,ast2400-i2c-bus";
+ reg = <0x40 0x40>, <0x200 0x10>;
+ compatible = "aspeed,ast2500-i2c-bus";
clocks = <&syscon ASPEED_CLK_APB>;
resets = <&syscon ASPEED_RESET_I2C>;
bus-frequency = <100000>;
--
2.17.1
next prev parent reply other threads:[~2021-02-24 19:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-24 19:17 [PATCH v4 0/4] i2c: aspeed: Add buffer and DMA modes support Jae Hyun Yoo
2021-02-24 19:17 ` Jae Hyun Yoo [this message]
2021-03-06 20:30 ` [PATCH v4 1/4] dt-bindings: i2c: aspeed: add transfer mode support Rob Herring
2021-03-09 17:02 ` Jae Hyun Yoo
2021-03-10 2:15 ` Rob Herring
2021-03-10 15:55 ` Jae Hyun Yoo
2021-04-08 17:50 ` Jae Hyun Yoo
2021-04-13 19:50 ` Brendan Higgins
2021-10-01 17:05 ` Jae Hyun Yoo
2021-02-24 19:17 ` [PATCH v4 2/4] ARM: dts: aspeed: modify I2C node to support buffer mode Jae Hyun Yoo
2021-02-24 19:17 ` [PATCH v4 3/4] i2c: aspeed: add buffer mode transfer support Jae Hyun Yoo
2021-04-13 21:24 ` Brendan Higgins
2021-02-24 19:17 ` [PATCH v4 4/4] i2c: aspeed: add DMA " Jae Hyun Yoo
2021-04-13 21:32 ` Brendan Higgins
2021-04-14 15:08 ` Jae Hyun Yoo
2021-05-19 18:38 ` Jae Hyun Yoo
2021-09-30 2:44 ` [PATCH v4 0/4] i2c: aspeed: Add buffer and DMA modes support Zev Weiss
2021-10-01 17:06 ` Jae Hyun Yoo
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