[PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Neil Armstrong]

In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
platform MHU driver based on arm_mhu.c.

This patchset follows a RFC thread along the GXBB SCPI support at :
http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
And specific MHU discussions at :
http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com

Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
 - Fix irq to signed to detect platform_get_irq() failures
 - Introduced back the secure channel
 - Fixed indexes

Changes since RFC v2 :
 - Rename to platform_mhu
 - Sync all link functions with arm_mhu

Neil Armstrong (3):
  mailbox: Add Platform Message-Handling-Unit variant driver
  dt-bindings: mailbox: Add Amlogic Meson MHU Bindings
  ARM64: dts: meson-gxbb: Add Meson MHU Node

 .../devicetree/bindings/mailbox/meson-mhu.txt      |  34 ++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   9 +
 drivers/mailbox/Kconfig                            |  10 +
 drivers/mailbox/Makefile                           |   2 +
 drivers/mailbox/platform_mhu.c                     | 205 +++++++++++++++++++++
 5 files changed, 260 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt
 create mode 100644 drivers/mailbox/platform_mhu.c

-- 
1.9.1

[PATCH v2 1/3] mailbox: Add Platform Message-Handling-Unit variant driver

[Neil Armstrong]

Add Message-Handling-Unit driver for platform variants as mailbox controller.
Actually, only the Amlogic Meson GXBB SoC MHU is supported.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/mailbox/Kconfig        |  10 ++
 drivers/mailbox/Makefile       |   2 +
 drivers/mailbox/platform_mhu.c | 205 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 217 insertions(+)
 create mode 100644 drivers/mailbox/platform_mhu.c

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 97c3729..4cc93c6 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -15,6 +15,16 @@ config ARM_MHU
 	  The controller has 3 mailbox channels, the last of which can be
 	  used in Secure mode only.
 
+config PLATFORM_MHU
+	tristate "Platform MHU Mailbox"
+	depends on OF
+	depends on HAS_IOMEM
+	help
+	  Say Y here if you want to build a platform specific variant MHU
+	  controller driver.
+	  The controller has a maximum of 3 mailbox channels, the last of
+	  which can be used in Secure mode only.
+
 config PL320_MBOX
 	bool "ARM PL320 Mailbox"
 	depends on ARM_AMBA
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 66c38e3..ace6fed 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -6,6 +6,8 @@ obj-$(CONFIG_MAILBOX_TEST)	+= mailbox-test.o
 
 obj-$(CONFIG_ARM_MHU)	+= arm_mhu.o
 
+obj-$(CONFIG_PLATFORM_MHU)	+= platform_mhu.o
+
 obj-$(CONFIG_PL320_MBOX)	+= pl320-ipc.o
 
 obj-$(CONFIG_OMAP2PLUS_MBOX)	+= omap-mailbox.o
diff --git a/drivers/mailbox/platform_mhu.c b/drivers/mailbox/platform_mhu.c
new file mode 100644
index 0000000..e13201a
--- /dev/null
+++ b/drivers/mailbox/platform_mhu.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2016 BayLibre SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ * Synchronised with arm_mhu.c from :
+ * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd.
+ * Copyright (C) 2015 Linaro Ltd.
+ * Author: Jassi Brar <jaswinder.singh@linaro.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mailbox_controller.h>
+
+#define INTR_SET_OFS	0x0
+#define INTR_STAT_OFS	0x4
+#define INTR_CLR_OFS	0x8
+
+#define MHU_SEC_OFFSET	0x0
+#define MHU_LP_OFFSET	0xc
+#define MHU_HP_OFFSET	0x18
+#define TX_REG_OFFSET	0x24
+
+#define MHU_CHANS	3
+
+struct platform_mhu_link {
+	int irq;
+	void __iomem *tx_reg;
+	void __iomem *rx_reg;
+};
+
+struct platform_mhu {
+	void __iomem *base;
+	struct platform_mhu_link mlink[MHU_CHANS];
+	struct mbox_chan chan[MHU_CHANS];
+	struct mbox_controller mbox;
+};
+
+static irqreturn_t platform_mhu_rx_interrupt(int irq, void *p)
+{
+	struct mbox_chan *chan = p;
+	struct platform_mhu_link *mlink = chan->con_priv;
+	u32 val;
+
+	val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS);
+	if (!val)
+		return IRQ_NONE;
+
+	mbox_chan_received_data(chan, (void *)&val);
+
+	writel_relaxed(val, mlink->rx_reg + INTR_CLR_OFS);
+
+	return IRQ_HANDLED;
+}
+
+static bool platform_mhu_last_tx_done(struct mbox_chan *chan)
+{
+	struct platform_mhu_link *mlink = chan->con_priv;
+	u32 val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS);
+
+	return (val == 0);
+}
+
+static int platform_mhu_send_data(struct mbox_chan *chan, void *data)
+{
+	struct platform_mhu_link *mlink = chan->con_priv;
+	u32 *arg = data;
+
+	writel_relaxed(*arg, mlink->tx_reg + INTR_SET_OFS);
+
+	return 0;
+}
+
+static int platform_mhu_startup(struct mbox_chan *chan)
+{
+	struct platform_mhu_link *mlink = chan->con_priv;
+	u32 val;
+	int ret;
+
+	val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS);
+	writel_relaxed(val, mlink->tx_reg + INTR_CLR_OFS);
+
+	ret = request_irq(mlink->irq, platform_mhu_rx_interrupt,
+			  IRQF_SHARED, "platform_mhu_link", chan);
+	if (ret) {
+		dev_err(chan->mbox->dev,
+			"Unable to acquire IRQ %d\n", mlink->irq);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void platform_mhu_shutdown(struct mbox_chan *chan)
+{
+	struct platform_mhu_link *mlink = chan->con_priv;
+
+	free_irq(mlink->irq, chan);
+}
+
+static const struct mbox_chan_ops platform_mhu_ops = {
+	.send_data = platform_mhu_send_data,
+	.startup = platform_mhu_startup,
+	.shutdown = platform_mhu_shutdown,
+	.last_tx_done = platform_mhu_last_tx_done,
+};
+
+static int platform_mhu_probe(struct platform_device *pdev)
+{
+	int i, err;
+	struct platform_mhu *mhu;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int platform_mhu_reg[MHU_CHANS] = {
+		MHU_SEC_OFFSET, MHU_LP_OFFSET, MHU_HP_OFFSET
+	};
+
+	/* Allocate memory for device */
+	mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL);
+	if (!mhu)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mhu->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mhu->base)) {
+		dev_err(dev, "ioremap failed\n");
+		return PTR_ERR(mhu->base);
+	}
+
+	for (i = 0; i < MHU_CHANS; i++) {
+		mhu->chan[i].con_priv = &mhu->mlink[i];
+		mhu->mlink[i].irq = platform_get_irq(pdev, i);
+		if (mhu->mlink[i].irq < 0) {
+			dev_err(dev, "failed to get irq%d\n", i);
+			return mhu->mlink[i].irq;
+		}
+		mhu->mlink[i].rx_reg = mhu->base + platform_mhu_reg[i];
+		mhu->mlink[i].tx_reg = mhu->mlink[i].rx_reg + TX_REG_OFFSET;
+	}
+
+	mhu->mbox.dev = dev;
+	mhu->mbox.chans = &mhu->chan[0];
+	mhu->mbox.num_chans = MHU_CHANS;
+	mhu->mbox.ops = &platform_mhu_ops;
+	mhu->mbox.txdone_irq = false;
+	mhu->mbox.txdone_poll = true;
+	mhu->mbox.txpoll_period = 1;
+
+	platform_set_drvdata(pdev, mhu);
+
+	err = mbox_controller_register(&mhu->mbox);
+	if (err) {
+		dev_err(dev, "Failed to register mailboxes %d\n", err);
+		return err;
+	}
+
+	dev_info(dev, "Platform MHU Mailbox registered\n");
+	return 0;
+}
+
+static int platform_mhu_remove(struct platform_device *pdev)
+{
+	struct platform_mhu *mhu = platform_get_drvdata(pdev);
+
+	mbox_controller_unregister(&mhu->mbox);
+
+	return 0;
+}
+
+static const struct of_device_id platform_mhu_dt_ids[] = {
+	{ .compatible = "amlogic,meson-gxbb-mhu", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, platform_mhu_dt_ids);
+
+static struct platform_driver platform_mhu_driver = {
+	.probe	= platform_mhu_probe,
+	.remove	= platform_mhu_remove,
+	.driver = {
+		.name = "platform-mhu",
+		.of_match_table	= platform_mhu_dt_ids,
+	},
+};
+
+module_platform_driver(platform_mhu_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:platform-mhu");
+MODULE_DESCRIPTION("Platform MHU Driver");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
-- 
1.9.1

[PATCH v2 2/3] dt-bindings: mailbox: Add Amlogic Meson MHU Bindings

[Neil Armstrong]

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 .../devicetree/bindings/mailbox/meson-mhu.txt      | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt

diff --git a/Documentation/devicetree/bindings/mailbox/meson-mhu.txt b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt
new file mode 100644
index 0000000..a530310
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt
@@ -0,0 +1,34 @@
+Amlogic Meson MHU Mailbox Driver
+================================
+
+The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller
+that has 3 independent channels/links to communicate with remote processor(s).
+MHU links are hardwired on a platform. A link raises interrupt for any
+received data. However, there is no specified way of knowing if the sent
+data has been read by the remote. This driver assumes the sender polls
+STAT register and the remote clears it after having read the data.
+
+Mailbox Device Node:
+====================
+
+Required properties:
+--------------------
+- compatible:		Shall be "amlogic,meson-gxbb-mhu"
+- reg:			Contains the mailbox register address range (base
+			address and length)
+- #mbox-cells		Shall be 1 - the index of the channel needed.
+- interrupts:		Contains the interrupt information corresponding to
+			each of the 2 links of MHU.
+
+Example:
+--------
+
+	mailbox: mailbox@c883c404 {
+		#mbox-cells = <1>;
+		compatible = "amlogic,meson-gxbb-mhu";
+		reg = <0 0xc883c404 0 0x4c>;
+		interrupts = <0 208 IRQ_TYPE_EDGE_RISING>,
+			     <0 209 IRQ_TYPE_EDGE_RISING>,
+			     <0 210 IRQ_TYPE_EDGE_RISING>;
+		#mbox-cells = <1>;
+	};
-- 
1.9.1

[PATCH v2 3/3] ARM64: dts: meson-gxbb: Add Meson MHU Node

[Neil Armstrong]

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index e502c24..bdbf6e7 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -321,6 +321,15 @@
 				#clock-cells = <1>;
 				reg = <0x0 0x0 0x0 0x3db>;
 			};
+
+			mailbox: mailbox@404 {
+				compatible = "amlogic,meson-gxbb-mhu";
+				reg = <0 0x404 0 0x4c>;
+				interrupts = <0 208 IRQ_TYPE_EDGE_RISING>,
+					     <0 209 IRQ_TYPE_EDGE_RISING>,
+					     <0 210 IRQ_TYPE_EDGE_RISING>;
+				#mbox-cells = <1>;
+			};
 		};
 
 		apb: apb@d0000000 {
-- 
1.9.1

Re: [PATCH v2 3/3] ARM64: dts: meson-gxbb: Add Meson MHU Node

[Kevin Hilman]

Neil Armstrong <narmstrong@baylibre.com> writes:

> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)

Applied,

Kevin

> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> index e502c24..bdbf6e7 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> @@ -321,6 +321,15 @@
>  				#clock-cells = <1>;
>  				reg = <0x0 0x0 0x0 0x3db>;
>  			};
> +
> +			mailbox: mailbox@404 {
> +				compatible = "amlogic,meson-gxbb-mhu";
> +				reg = <0 0x404 0 0x4c>;
> +				interrupts = <0 208 IRQ_TYPE_EDGE_RISING>,
> +					     <0 209 IRQ_TYPE_EDGE_RISING>,
> +					     <0 210 IRQ_TYPE_EDGE_RISING>;
> +				#mbox-cells = <1>;
> +			};
>  		};
>  
>  		apb: apb@d0000000 {

Re: [PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Kevin Hilman]

Hi Jassi,

Neil Armstrong <narmstrong@baylibre.com> writes:

> In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
> platform MHU driver based on arm_mhu.c.
>
> This patchset follows a RFC thread along the GXBB SCPI support at :
> http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
> And specific MHU discussions at :
> http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com
>
> Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
>  - Fix irq to signed to detect platform_get_irq() failures
>  - Introduced back the secure channel
>  - Fixed indexes

How is this version looking to you?

With your review/ack on the driver, I'd be happy to take it via the
amlogic tree as there shouldn't be any conflicts with your tree.

Kevin

> Changes since RFC v2 :
>  - Rename to platform_mhu
>  - Sync all link functions with arm_mhu
>
> Neil Armstrong (3):
>   mailbox: Add Platform Message-Handling-Unit variant driver
>   dt-bindings: mailbox: Add Amlogic Meson MHU Bindings
>   ARM64: dts: meson-gxbb: Add Meson MHU Node
>
>  .../devicetree/bindings/mailbox/meson-mhu.txt      |  34 ++++
>  arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   9 +
>  drivers/mailbox/Kconfig                            |  10 +
>  drivers/mailbox/Makefile                           |   2 +
>  drivers/mailbox/platform_mhu.c                     | 205 +++++++++++++++++++++
>  5 files changed, 260 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt
>  create mode 100644 drivers/mailbox/platform_mhu.c

Re: [PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Jassi Brar]

On Sat, Sep 3, 2016 at 5:04 AM, Kevin Hilman <khilman@baylibre.com> wrote:
> Hi Jassi,
>
> Neil Armstrong <narmstrong@baylibre.com> writes:
>
>> In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
>> platform MHU driver based on arm_mhu.c.
>>
>> This patchset follows a RFC thread along the GXBB SCPI support at :
>> http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
>> And specific MHU discussions at :
>> http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com
>>
>> Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
>>  - Fix irq to signed to detect platform_get_irq() failures
>>  - Introduced back the secure channel
>>  - Fixed indexes
>
> How is this version looking to you?
>
> With your review/ack on the driver, I'd be happy to take it via the
> amlogic tree as there shouldn't be any conflicts with your tree.
>
I am ok with the driver, but I don't understand how it helps going via
amlogic tree. I would like to send a pull request every release ;)

cheers.

Re: [PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Kevin Hilman]

On Fri, Sep 2, 2016 at 10:33 PM, Jassi Brar <jassisinghbrar@gmail.com> wrote:
> On Sat, Sep 3, 2016 at 5:04 AM, Kevin Hilman <khilman@baylibre.com> wrote:
>> Hi Jassi,
>>
>> Neil Armstrong <narmstrong@baylibre.com> writes:
>>
>>> In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
>>> platform MHU driver based on arm_mhu.c.
>>>
>>> This patchset follows a RFC thread along the GXBB SCPI support at :
>>> http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
>>> And specific MHU discussions at :
>>> http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com
>>>
>>> Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
>>>  - Fix irq to signed to detect platform_get_irq() failures
>>>  - Introduced back the secure channel
>>>  - Fixed indexes
>>
>> How is this version looking to you?
>>
>> With your review/ack on the driver, I'd be happy to take it via the
>> amlogic tree as there shouldn't be any conflicts with your tree.
>>
> I am ok with the driver, but I don't understand how it helps going via
> amlogic tree. I would like to send a pull request every release ;)

That's fine with me too.  I offered tot take int just in case you had
already sent pull requests for this cycle, and also since I'll take
the DT changes through arm-soc.

Either way is fine with me. Just let me know.

Thanks,

Kevin

Re: [PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Jassi Brar]

On Sun, Sep 4, 2016 at 2:15 AM, Kevin Hilman <khilman@baylibre.com> wrote:
> On Fri, Sep 2, 2016 at 10:33 PM, Jassi Brar <jassisinghbrar@gmail.com> wrote:
>> On Sat, Sep 3, 2016 at 5:04 AM, Kevin Hilman <khilman@baylibre.com> wrote:
>>> Hi Jassi,
>>>
>>> Neil Armstrong <narmstrong@baylibre.com> writes:
>>>
>>>> In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
>>>> platform MHU driver based on arm_mhu.c.
>>>>
>>>> This patchset follows a RFC thread along the GXBB SCPI support at :
>>>> http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
>>>> And specific MHU discussions at :
>>>> http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com
>>>>
>>>> Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
>>>>  - Fix irq to signed to detect platform_get_irq() failures
>>>>  - Introduced back the secure channel
>>>>  - Fixed indexes
>>>
>>> How is this version looking to you?
>>>
>>> With your review/ack on the driver, I'd be happy to take it via the
>>> amlogic tree as there shouldn't be any conflicts with your tree.
>>>
>> I am ok with the driver, but I don't understand how it helps going via
>> amlogic tree. I would like to send a pull request every release ;)
>
> That's fine with me too.  I offered tot take int just in case you had
> already sent pull requests for this cycle, and also since I'll take
> the DT changes through arm-soc.
>
This revision came after rc2, so it wasn't included. I will queue
patch-1 & 2 for next release, and you the patch-3.

Thanks.

Re: [PATCH v2 0/3] Add Platform MHU mailbox driver for Amlogic GXBB

[Kevin Hilman]

Jassi Brar <jassisinghbrar@gmail.com> writes:

> On Sun, Sep 4, 2016 at 2:15 AM, Kevin Hilman <khilman@baylibre.com> wrote:
>> On Fri, Sep 2, 2016 at 10:33 PM, Jassi Brar <jassisinghbrar@gmail.com> wrote:
>>> On Sat, Sep 3, 2016 at 5:04 AM, Kevin Hilman <khilman@baylibre.com> wrote:
>>>> Hi Jassi,
>>>>
>>>> Neil Armstrong <narmstrong@baylibre.com> writes:
>>>>
>>>>> In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
>>>>> platform MHU driver based on arm_mhu.c.
>>>>>
>>>>> This patchset follows a RFC thread along the GXBB SCPI support at :
>>>>> http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong@baylibre.com
>>>>> And specific MHU discussions at :
>>>>> http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ@mail.gmail.com
>>>>>
>>>>> Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong@baylibre.com :
>>>>>  - Fix irq to signed to detect platform_get_irq() failures
>>>>>  - Introduced back the secure channel
>>>>>  - Fixed indexes
>>>>
>>>> How is this version looking to you?
>>>>
>>>> With your review/ack on the driver, I'd be happy to take it via the
>>>> amlogic tree as there shouldn't be any conflicts with your tree.
>>>>
>>> I am ok with the driver, but I don't understand how it helps going via
>>> amlogic tree. I would like to send a pull request every release ;)
>>
>> That's fine with me too.  I offered tot take int just in case you had
>> already sent pull requests for this cycle, and also since I'll take
>> the DT changes through arm-soc.
>>
> This revision came after rc2, so it wasn't included. I will queue
> patch-1 & 2 for next release, and you the patch-3.

OK, sounds good.  Thanks,

Kevin