[PATCH v3 0/3] Add support for Hi3660 stub clock

[PATCH v3 0/3] Add support for Hi3660 stub clock

[Xu YiPing]

From: Leo Yan <leo.yan@linaro.org>

Hi3660 has stub clocks for two CPU clusters, GPU and DDR; and the stub
clocks use the mailbox to send message to MCU for frequency scaling.

This patch set adds support Hi3660 stub clock, and since it needs to
use mailbox so this patch set has dependency with Hi3660 mailbox
patch set [1].

This patch set has been tested on Hikey960 with CPUFreq enabled.

Changes from v1:
* According to Rob suggestion, moved dt header definition into DT patch;
* According to Julien suggestion, removed "dev" member from stub clock
  structure and refined code for global variable "stub_clk_chan";
* Fixed DT binding patch.

[1] http://archive.armlinux.org.uk/lurker/message/20171027.061501.f895dee8.en.html


Kaihua Zhong (2):
  clk: hisilicon: Add support for Hi3660 stub clocks
  arm64: dts: Hi3660: Add binding for stub clock

Leo Yan (1):
  dt-bindings: clk: Hi3660: Document stub clock

 .../devicetree/bindings/clock/hi3660-clock.txt     |   6 +
 arch/arm64/boot/dts/hisilicon/hi3660.dtsi          |   7 +
 drivers/clk/hisilicon/Kconfig                      |   6 +
 drivers/clk/hisilicon/Makefile                     |   1 +
 drivers/clk/hisilicon/clk-hi3660-stub.c            | 186 +++++++++++++++++++++
 include/dt-bindings/clock/hi3660-clock.h           |   7 +
 6 files changed, 213 insertions(+)
 create mode 100644 drivers/clk/hisilicon/clk-hi3660-stub.c

-- 
1.9.1

[PATCH v3 1/3] dt-bindings: clk: Hi3660: Document stub clock

[Xu YiPing]

From: Leo Yan <leo.yan@linaro.org>

Document the DT binding for stub clock which is used for CPU,
GPU and DDR frequency scaling.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 Documentation/devicetree/bindings/clock/hi3660-clock.txt | 6 ++++++
 include/dt-bindings/clock/hi3660-clock.h                 | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/hi3660-clock.txt b/Documentation/devicetree/bindings/clock/hi3660-clock.txt
index 0035a7e..946da7c 100644
--- a/Documentation/devicetree/bindings/clock/hi3660-clock.txt
+++ b/Documentation/devicetree/bindings/clock/hi3660-clock.txt
@@ -13,12 +13,18 @@ Required Properties:
 	- "hisilicon,hi3660-pmuctrl"
 	- "hisilicon,hi3660-sctrl"
 	- "hisilicon,hi3660-iomcu"
+	- "hisilicon,hi3660-stub-clk"
 
 - reg: physical base address of the controller and length of memory mapped
   region.
 
 - #clock-cells: should be 1.
 
+Optional Properties:
+
+- mboxes: Phandle to the mailbox for sending message to MCU.
+            (See: ../mailbox/hisilicon,hi3660-mailbox.txt for more info)
+
 Each clock is assigned an identifier and client nodes use this identifier
 to specify the clock which they consume.
 
diff --git a/include/dt-bindings/clock/hi3660-clock.h b/include/dt-bindings/clock/hi3660-clock.h
index adb768d..75d583e 100644
--- a/include/dt-bindings/clock/hi3660-clock.h
+++ b/include/dt-bindings/clock/hi3660-clock.h
@@ -208,4 +208,11 @@
 #define HI3660_CLK_I2C6_IOMCU		3
 #define HI3660_CLK_IOMCU_PERI0		4
 
+/* clk in stub clock */
+#define HI3660_CLK_STUB_CLUSTER0	0
+#define HI3660_CLK_STUB_CLUSTER1	1
+#define HI3660_CLK_STUB_GPU		2
+#define HI3660_CLK_STUB_DDR		3
+#define HI3660_CLK_STUB_NUM		4
+
 #endif	/* __DTS_HI3660_CLOCK_H */
-- 
1.9.1

[PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

[Xu YiPing]

From: Kaihua Zhong <zhongkaihua@huawei.com>

Hi3660 has four stub clocks, which are big and LITTLE cluster clocks,
GPU clock and DDR clock.  These clocks ask MCU for frequency scaling
by sending message through mailbox.

This commit adds support for stub clocks, it requests the dedicated
mailbox channel at initialization; then later uses this channel to send
message to MCU to execute frequency scaling. The four stub clocks share
the same mailbox channel, but every stub clock has its own command id so
MCU can distinguish the requirement coming for which clock.

A shared memory is used to present effective frequency value, so the
clock driver uses I/O mapping for the memory and reads back rate value.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
---
 drivers/clk/hisilicon/Kconfig           |   6 ++
 drivers/clk/hisilicon/Makefile          |   1 +
 drivers/clk/hisilicon/clk-hi3660-stub.c | 186 ++++++++++++++++++++++++++++++++
 3 files changed, 193 insertions(+)
 create mode 100644 drivers/clk/hisilicon/clk-hi3660-stub.c

diff --git a/drivers/clk/hisilicon/Kconfig b/drivers/clk/hisilicon/Kconfig
index 7098bfd..1bd4355 100644
--- a/drivers/clk/hisilicon/Kconfig
+++ b/drivers/clk/hisilicon/Kconfig
@@ -49,3 +49,9 @@ config STUB_CLK_HI6220
 	default ARCH_HISI
 	help
 	  Build the Hisilicon Hi6220 stub clock driver.
+
+config STUB_CLK_HI3660
+	bool "Hi3660 Stub Clock Driver"
+	depends on COMMON_CLK_HI3660 && MAILBOX
+	help
+	  Build the Hisilicon Hi3660 stub clock driver.
diff --git a/drivers/clk/hisilicon/Makefile b/drivers/clk/hisilicon/Makefile
index 1e4c3dd..0a5b499 100644
--- a/drivers/clk/hisilicon/Makefile
+++ b/drivers/clk/hisilicon/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_COMMON_CLK_HI3798CV200)	+= crg-hi3798cv200.o
 obj-$(CONFIG_COMMON_CLK_HI6220)	+= clk-hi6220.o
 obj-$(CONFIG_RESET_HISI)	+= reset.o
 obj-$(CONFIG_STUB_CLK_HI6220)	+= clk-hi6220-stub.o
+obj-$(CONFIG_STUB_CLK_HI3660)	+= clk-hi3660-stub.o
diff --git a/drivers/clk/hisilicon/clk-hi3660-stub.c b/drivers/clk/hisilicon/clk-hi3660-stub.c
new file mode 100644
index 0000000..607efa4
--- /dev/null
+++ b/drivers/clk/hisilicon/clk-hi3660-stub.c
@@ -0,0 +1,186 @@
+/*
+ * Hisilicon clock driver
+ *
+ * Copyright (c) 2013-2017 Hisilicon Limited.
+ * Copyright (c) 2017 Linaro Limited.
+ *
+ * Author: Kai Zhao <zhaokai1@hisilicon.com>
+ *	    Tao Wang <kevin.wangtao@hisilicon.com>
+ *	    Leo Yan <leo.yan@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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/clk-provider.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/clock/hi3660-clock.h>
+
+#define HI3660_STUB_CLOCK_DATA		(0x70)
+#define MHZ				(1000 * 1000)
+
+#define DEFINE_CLK_STUB(_id, _cmd, _name)			\
+	{							\
+		.id = (_id),					\
+		.cmd = (_cmd),					\
+		.hw.init = &(struct clk_init_data) {		\
+			.name = #_name,				\
+			.ops = &hi3660_stub_clk_ops,		\
+			.num_parents = 0,			\
+			.flags = CLK_GET_RATE_NOCACHE,		\
+		},						\
+	},
+
+#define to_stub_clk(_hw) container_of(_hw, struct hi3660_stub_clk, hw)
+
+struct hi3660_stub_clk_chan {
+	struct mbox_client cl;
+	struct mbox_chan *mbox;
+};
+
+struct hi3660_stub_clk {
+	unsigned int id;
+	struct clk_hw hw;
+	unsigned int cmd;
+	unsigned int msg[8];
+	unsigned int rate;
+};
+
+static void __iomem *freq_reg;
+static struct hi3660_stub_clk_chan stub_clk_chan;
+
+static unsigned long hi3660_stub_clk_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
+
+	/*
+	 * LPM3 writes back the CPU frequency in shared SRAM so read
+	 * back the frequency.
+	 */
+	stub_clk->rate = readl(freq_reg + (stub_clk->id << 2)) * MHZ;
+	return stub_clk->rate;
+}
+
+static long hi3660_stub_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long *prate)
+{
+	/*
+	 * LPM3 handles rate rounding so just return whatever
+	 * rate is requested.
+	 */
+	return rate;
+}
+
+static int hi3660_stub_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
+
+	stub_clk->msg[0] = stub_clk->cmd;
+	stub_clk->msg[1] = rate / MHZ;
+
+	dev_dbg(stub_clk_chan.cl.dev, "set rate msg[0]=0x%x msg[1]=0x%x\n",
+		stub_clk->msg[0], stub_clk->msg[1]);
+
+	mbox_send_message(stub_clk_chan.mbox, stub_clk->msg);
+	mbox_client_txdone(stub_clk_chan.mbox, 0);
+
+	stub_clk->rate = rate;
+	return 0;
+}
+
+static const struct clk_ops hi3660_stub_clk_ops = {
+	.recalc_rate    = hi3660_stub_clk_recalc_rate,
+	.round_rate     = hi3660_stub_clk_round_rate,
+	.set_rate       = hi3660_stub_clk_set_rate,
+};
+
+static struct hi3660_stub_clk hi3660_stub_clks[HI3660_CLK_STUB_NUM] = {
+	DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER0, 0x0001030A, "cpu-cluster.0")
+	DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER1, 0x0002030A, "cpu-cluster.1")
+	DEFINE_CLK_STUB(HI3660_CLK_STUB_GPU, 0x0003030A, "clk-g3d")
+	DEFINE_CLK_STUB(HI3660_CLK_STUB_DDR, 0x00040309, "clk-ddrc")
+};
+
+static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
+					     void *data)
+{
+	unsigned int idx = clkspec->args[0];
+
+	if (idx > HI3660_CLK_STUB_NUM) {
+		pr_err("%s: invalid index %u\n", __func__, idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return &hi3660_stub_clks[idx].hw;
+}
+
+static int hi3660_stub_clk_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	unsigned int i;
+	int ret;
+
+	/* Use mailbox client without blocking */
+	stub_clk_chan.cl.dev = dev;
+	stub_clk_chan.cl.tx_done = NULL;
+	stub_clk_chan.cl.tx_block = false;
+	stub_clk_chan.cl.knows_txdone = false;
+
+	/* Allocate mailbox channel */
+	stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
+	if (IS_ERR(stub_clk_chan.mbox))
+		return PTR_ERR(stub_clk_chan.mbox);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	freq_reg = devm_ioremap(dev, res->start, resource_size(res));
+	if (IS_ERR(freq_reg))
+		return -ENOMEM;
+
+	freq_reg += HI3660_STUB_CLOCK_DATA;
+
+	for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
+		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
+		if (ret)
+			return ret;
+	}
+
+	ret = of_clk_add_hw_provider(pdev->dev.of_node, hi3660_stub_clk_hw_get,
+				     hi3660_stub_clks);
+	return ret;
+}
+
+static const struct of_device_id hi3660_stub_clk_of_match[] = {
+	{ .compatible = "hisilicon,hi3660-stub-clk", },
+	{}
+};
+
+static struct platform_driver hi3660_stub_clk_driver = {
+	.probe	= hi3660_stub_clk_probe,
+	.driver = {
+		.name = "hi3660-stub-clk",
+		.of_match_table = hi3660_stub_clk_of_match,
+	},
+};
+
+static int __init hi3660_stub_clk_init(void)
+{
+	return platform_driver_register(&hi3660_stub_clk_driver);
+}
+subsys_initcall(hi3660_stub_clk_init);
-- 
1.9.1

[PATCH v3 3/3] arm64: dts: Hi3660: Add binding for stub clock

[Xu YiPing]

From: Kaihua Zhong <zhongkaihua@huawei.com>

Add DT binding for Hi3660 stub clock driver.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
---
 arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
index 451b6bf..cbbc7f1 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
@@ -293,6 +293,13 @@
 			#mbox-cells = <3>;
 		};
 
+		stub_clock: stub_clock@e896b500 {
+			compatible = "hisilicon,hi3660-stub-clk";
+			reg = <0x0 0xe896b500 0x0 0x0100>;
+			#clock-cells = <1>;
+			mboxes = <&mailbox 13 3 0>;
+		};
+
 		dual_timer0: timer@fff14000 {
 			compatible = "arm,sp804", "arm,primecell";
 			reg = <0x0 0xfff14000 0x0 0x1000>;
-- 
1.9.1

Re: [PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

[Leo Yan]

On Fri, Nov 17, 2017 at 05:27:31PM +0800, Xu YiPing wrote:
> From: Kaihua Zhong <zhongkaihua@huawei.com>
> 
> Hi3660 has four stub clocks, which are big and LITTLE cluster clocks,
> GPU clock and DDR clock.  These clocks ask MCU for frequency scaling
> by sending message through mailbox.
> 
> This commit adds support for stub clocks, it requests the dedicated
> mailbox channel at initialization; then later uses this channel to send
> message to MCU to execute frequency scaling. The four stub clocks share
> the same mailbox channel, but every stub clock has its own command id so
> MCU can distinguish the requirement coming for which clock.
> 
> A shared memory is used to present effective frequency value, so the
> clock driver uses I/O mapping for the memory and reads back rate value.

Hi Michael, Stephen,

Could you help review this patch?

> Reviewed-by: Leo Yan <leo.yan@linaro.org>
> Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
> Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
> Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
> Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
> ---
>  drivers/clk/hisilicon/Kconfig           |   6 ++
>  drivers/clk/hisilicon/Makefile          |   1 +
>  drivers/clk/hisilicon/clk-hi3660-stub.c | 186 ++++++++++++++++++++++++++++++++
>  3 files changed, 193 insertions(+)
>  create mode 100644 drivers/clk/hisilicon/clk-hi3660-stub.c
> 
> diff --git a/drivers/clk/hisilicon/Kconfig b/drivers/clk/hisilicon/Kconfig
> index 7098bfd..1bd4355 100644
> --- a/drivers/clk/hisilicon/Kconfig
> +++ b/drivers/clk/hisilicon/Kconfig
> @@ -49,3 +49,9 @@ config STUB_CLK_HI6220
>  	default ARCH_HISI
>  	help
>  	  Build the Hisilicon Hi6220 stub clock driver.
> +
> +config STUB_CLK_HI3660
> +	bool "Hi3660 Stub Clock Driver"
> +	depends on COMMON_CLK_HI3660 && MAILBOX
> +	help
> +	  Build the Hisilicon Hi3660 stub clock driver.
> diff --git a/drivers/clk/hisilicon/Makefile b/drivers/clk/hisilicon/Makefile
> index 1e4c3dd..0a5b499 100644
> --- a/drivers/clk/hisilicon/Makefile
> +++ b/drivers/clk/hisilicon/Makefile
> @@ -14,3 +14,4 @@ obj-$(CONFIG_COMMON_CLK_HI3798CV200)	+= crg-hi3798cv200.o
>  obj-$(CONFIG_COMMON_CLK_HI6220)	+= clk-hi6220.o
>  obj-$(CONFIG_RESET_HISI)	+= reset.o
>  obj-$(CONFIG_STUB_CLK_HI6220)	+= clk-hi6220-stub.o
> +obj-$(CONFIG_STUB_CLK_HI3660)	+= clk-hi3660-stub.o
> diff --git a/drivers/clk/hisilicon/clk-hi3660-stub.c b/drivers/clk/hisilicon/clk-hi3660-stub.c
> new file mode 100644
> index 0000000..607efa4
> --- /dev/null
> +++ b/drivers/clk/hisilicon/clk-hi3660-stub.c
> @@ -0,0 +1,186 @@
> +/*
> + * Hisilicon clock driver
> + *
> + * Copyright (c) 2013-2017 Hisilicon Limited.
> + * Copyright (c) 2017 Linaro Limited.
> + *
> + * Author: Kai Zhao <zhaokai1@hisilicon.com>
> + *	    Tao Wang <kevin.wangtao@hisilicon.com>
> + *	    Leo Yan <leo.yan@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; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * 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/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <dt-bindings/clock/hi3660-clock.h>
> +
> +#define HI3660_STUB_CLOCK_DATA		(0x70)
> +#define MHZ				(1000 * 1000)
> +
> +#define DEFINE_CLK_STUB(_id, _cmd, _name)			\
> +	{							\
> +		.id = (_id),					\
> +		.cmd = (_cmd),					\
> +		.hw.init = &(struct clk_init_data) {		\
> +			.name = #_name,				\
> +			.ops = &hi3660_stub_clk_ops,		\
> +			.num_parents = 0,			\
> +			.flags = CLK_GET_RATE_NOCACHE,		\
> +		},						\
> +	},
> +
> +#define to_stub_clk(_hw) container_of(_hw, struct hi3660_stub_clk, hw)
> +
> +struct hi3660_stub_clk_chan {
> +	struct mbox_client cl;
> +	struct mbox_chan *mbox;
> +};
> +
> +struct hi3660_stub_clk {
> +	unsigned int id;
> +	struct clk_hw hw;
> +	unsigned int cmd;
> +	unsigned int msg[8];
> +	unsigned int rate;
> +};
> +
> +static void __iomem *freq_reg;
> +static struct hi3660_stub_clk_chan stub_clk_chan;
> +
> +static unsigned long hi3660_stub_clk_recalc_rate(struct clk_hw *hw,
> +						 unsigned long parent_rate)
> +{
> +	struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
> +
> +	/*
> +	 * LPM3 writes back the CPU frequency in shared SRAM so read
> +	 * back the frequency.
> +	 */
> +	stub_clk->rate = readl(freq_reg + (stub_clk->id << 2)) * MHZ;
> +	return stub_clk->rate;
> +}
> +
> +static long hi3660_stub_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +				       unsigned long *prate)
> +{
> +	/*
> +	 * LPM3 handles rate rounding so just return whatever
> +	 * rate is requested.
> +	 */
> +	return rate;
> +}
> +
> +static int hi3660_stub_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +				    unsigned long parent_rate)
> +{
> +	struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
> +
> +	stub_clk->msg[0] = stub_clk->cmd;
> +	stub_clk->msg[1] = rate / MHZ;
> +
> +	dev_dbg(stub_clk_chan.cl.dev, "set rate msg[0]=0x%x msg[1]=0x%x\n",
> +		stub_clk->msg[0], stub_clk->msg[1]);
> +
> +	mbox_send_message(stub_clk_chan.mbox, stub_clk->msg);
> +	mbox_client_txdone(stub_clk_chan.mbox, 0);
> +
> +	stub_clk->rate = rate;
> +	return 0;
> +}
> +
> +static const struct clk_ops hi3660_stub_clk_ops = {
> +	.recalc_rate    = hi3660_stub_clk_recalc_rate,
> +	.round_rate     = hi3660_stub_clk_round_rate,
> +	.set_rate       = hi3660_stub_clk_set_rate,
> +};
> +
> +static struct hi3660_stub_clk hi3660_stub_clks[HI3660_CLK_STUB_NUM] = {
> +	DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER0, 0x0001030A, "cpu-cluster.0")
> +	DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER1, 0x0002030A, "cpu-cluster.1")
> +	DEFINE_CLK_STUB(HI3660_CLK_STUB_GPU, 0x0003030A, "clk-g3d")
> +	DEFINE_CLK_STUB(HI3660_CLK_STUB_DDR, 0x00040309, "clk-ddrc")
> +};
> +
> +static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
> +					     void *data)
> +{
> +	unsigned int idx = clkspec->args[0];
> +
> +	if (idx > HI3660_CLK_STUB_NUM) {
> +		pr_err("%s: invalid index %u\n", __func__, idx);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	return &hi3660_stub_clks[idx].hw;
> +}
> +
> +static int hi3660_stub_clk_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	unsigned int i;
> +	int ret;
> +
> +	/* Use mailbox client without blocking */
> +	stub_clk_chan.cl.dev = dev;
> +	stub_clk_chan.cl.tx_done = NULL;
> +	stub_clk_chan.cl.tx_block = false;
> +	stub_clk_chan.cl.knows_txdone = false;
> +
> +	/* Allocate mailbox channel */
> +	stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
> +	if (IS_ERR(stub_clk_chan.mbox))
> +		return PTR_ERR(stub_clk_chan.mbox);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	freq_reg = devm_ioremap(dev, res->start, resource_size(res));
> +	if (IS_ERR(freq_reg))
> +		return -ENOMEM;
> +
> +	freq_reg += HI3660_STUB_CLOCK_DATA;
> +
> +	for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
> +		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = of_clk_add_hw_provider(pdev->dev.of_node, hi3660_stub_clk_hw_get,
> +				     hi3660_stub_clks);
> +	return ret;
> +}
> +
> +static const struct of_device_id hi3660_stub_clk_of_match[] = {
> +	{ .compatible = "hisilicon,hi3660-stub-clk", },
> +	{}
> +};
> +
> +static struct platform_driver hi3660_stub_clk_driver = {
> +	.probe	= hi3660_stub_clk_probe,
> +	.driver = {
> +		.name = "hi3660-stub-clk",
> +		.of_match_table = hi3660_stub_clk_of_match,
> +	},
> +};
> +
> +static int __init hi3660_stub_clk_init(void)
> +{
> +	return platform_driver_register(&hi3660_stub_clk_driver);
> +}
> +subsys_initcall(hi3660_stub_clk_init);
> -- 
> 1.9.1
> 

Re: [PATCH v3 1/3] dt-bindings: clk: Hi3660: Document stub clock

[Stephen Boyd]

On 11/17, Xu YiPing wrote:
> From: Leo Yan <leo.yan@linaro.org>
> 
> Document the DT binding for stub clock which is used for CPU,
> GPU and DDR frequency scaling.
> 
> Acked-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
> ---

Applied to clk-next

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

[Stephen Boyd]

On 11/17, Xu YiPing wrote:
> From: Kaihua Zhong <zhongkaihua@huawei.com>
> +
> +static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
> +					     void *data)
> +{
> +	unsigned int idx = clkspec->args[0];
> +
> +	if (idx > HI3660_CLK_STUB_NUM) {

This should be >=

> +	}
> +
> +	return &hi3660_stub_clks[idx].hw;
> +}
> +
> +static int hi3660_stub_clk_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	unsigned int i;
> +	int ret;
> +
> +	/* Use mailbox client without blocking */
> +	stub_clk_chan.cl.dev = dev;
> +	stub_clk_chan.cl.tx_done = NULL;
> +	stub_clk_chan.cl.tx_block = false;
> +	stub_clk_chan.cl.knows_txdone = false;
> +
> +	/* Allocate mailbox channel */
> +	stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
> +	if (IS_ERR(stub_clk_chan.mbox))
> +		return PTR_ERR(stub_clk_chan.mbox);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	freq_reg = devm_ioremap(dev, res->start, resource_size(res));
> +	if (IS_ERR(freq_reg))

Pretty sure this returns NULL on failure, not an error pointer.

> +		return -ENOMEM;
> +
> +	freq_reg += HI3660_STUB_CLOCK_DATA;
> +
> +	for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
> +		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = of_clk_add_hw_provider(pdev->dev.of_node, hi3660_stub_clk_hw_get,
> +				     hi3660_stub_clks);

This can use devm

> +	return ret;
> +}
> +

I fixed it all and merged into clk-next.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

[Leo Yan]

On Wed, Dec 06, 2017 at 11:05:50PM -0800, Stephen Boyd wrote:
> On 11/17, Xu YiPing wrote:
> > From: Kaihua Zhong <zhongkaihua@huawei.com>
> > +
> > +static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
> > +					     void *data)
> > +{
> > +	unsigned int idx = clkspec->args[0];
> > +
> > +	if (idx > HI3660_CLK_STUB_NUM) {
> 
> This should be >=
> 
> > +	}
> > +
> > +	return &hi3660_stub_clks[idx].hw;
> > +}
> > +
> > +static int hi3660_stub_clk_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct resource *res;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	/* Use mailbox client without blocking */
> > +	stub_clk_chan.cl.dev = dev;
> > +	stub_clk_chan.cl.tx_done = NULL;
> > +	stub_clk_chan.cl.tx_block = false;
> > +	stub_clk_chan.cl.knows_txdone = false;
> > +
> > +	/* Allocate mailbox channel */
> > +	stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
> > +	if (IS_ERR(stub_clk_chan.mbox))
> > +		return PTR_ERR(stub_clk_chan.mbox);
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	freq_reg = devm_ioremap(dev, res->start, resource_size(res));
> > +	if (IS_ERR(freq_reg))
> 
> Pretty sure this returns NULL on failure, not an error pointer.
> 
> > +		return -ENOMEM;
> > +
> > +	freq_reg += HI3660_STUB_CLOCK_DATA;
> > +
> > +	for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
> > +		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	ret = of_clk_add_hw_provider(pdev->dev.of_node, hi3660_stub_clk_hw_get,
> > +				     hi3660_stub_clks);
> 
> This can use devm
> 
> > +	return ret;
> > +}
> > +
> 
> I fixed it all and merged into clk-next.

Ah, very appreciate your help, Stephen.

Thanks,
Leo Yan

Re: [PATCH v3 3/3] arm64: dts: Hi3660: Add binding for stub clock

[Leo Yan]

Hi Wei,

On Fri, Nov 17, 2017 at 05:27:32PM +0800, Xu YiPing wrote:
> From: Kaihua Zhong <zhongkaihua@huawei.com>
> 
> Add DT binding for Hi3660 stub clock driver.
> 
> Reviewed-by: Leo Yan <leo.yan@linaro.org>
> Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
> Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
> Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
> Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>

Could you help to pick up this patch? Thanks!

> ---
>  arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> index 451b6bf..cbbc7f1 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> @@ -293,6 +293,13 @@
>  			#mbox-cells = <3>;
>  		};
>  
> +		stub_clock: stub_clock@e896b500 {
> +			compatible = "hisilicon,hi3660-stub-clk";
> +			reg = <0x0 0xe896b500 0x0 0x0100>;
> +			#clock-cells = <1>;
> +			mboxes = <&mailbox 13 3 0>;
> +		};
> +
>  		dual_timer0: timer@fff14000 {
>  			compatible = "arm,sp804", "arm,primecell";
>  			reg = <0x0 0xfff14000 0x0 0x1000>;
> -- 
> 1.9.1
> 

Re: [PATCH v3 3/3] arm64: dts: Hi3660: Add binding for stub clock

[Wei Xu]

Hi Leo, YiPing,

On 2018/2/28 5:06, Leo Yan wrote:
> Hi Wei,
> 
> On Fri, Nov 17, 2017 at 05:27:32PM +0800, Xu YiPing wrote:
>> From: Kaihua Zhong <zhongkaihua@huawei.com>
>>
>> Add DT binding for Hi3660 stub clock driver.
>>
>> Reviewed-by: Leo Yan <leo.yan@linaro.org>
>> Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
>> Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
>> Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
>> Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
> 
> Could you help to pick up this patch? Thanks!

It failed to merge because of the mailbox part.
Once the mailbox driver is accepted, I will pick up this.
Thanks!

Best Regards,
Wei

> 
>> ---
>>  arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>> index 451b6bf..cbbc7f1 100644
>> --- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>> +++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
>> @@ -293,6 +293,13 @@
>>  			#mbox-cells = <3>;
>>  		};
>>  
>> +		stub_clock: stub_clock@e896b500 {
>> +			compatible = "hisilicon,hi3660-stub-clk";
>> +			reg = <0x0 0xe896b500 0x0 0x0100>;
>> +			#clock-cells = <1>;
>> +			mboxes = <&mailbox 13 3 0>;
>> +		};
>> +
>>  		dual_timer0: timer@fff14000 {
>>  			compatible = "arm,sp804", "arm,primecell";
>>  			reg = <0x0 0xfff14000 0x0 0x1000>;
>> -- 
>> 1.9.1
>>
> 
> .
>