[PATCH v2 0/5] clk: sunxi: Add support for USB clocks and reset bits

[PATCH v2 0/5] clk: sunxi: Add support for USB clocks and reset bits

[Hans de Goede]

Hi Emilio, Maxime, et al,

Emilio, here is v2 of my patch-set adding support for sunxi-clk USB clocks and
reset bits. This addresses all your review comments from v1.

Can you add the first 2 patches to your queue of patches for Mike for 3.15 ?

Maxime, can you add patch 3-5 which add the dt bindings for this to your
tree please ?

Thanks & Regards,

Hans

[PATCH v2 1/5] clk: sunxi: Add support for USB clock-register reset bits

[Hans de Goede]

The usb-clk register is special in that it not only contains clk gate bits,
but also has a few reset bits. This commit adds support for this by allowing
gates type sunxi clks to also register a reset controller.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 drivers/clk/sunxi/clk-sunxi.c | 71 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 03bb8b8..f1a147c 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -18,6 +18,7 @@
 #include <linux/clkdev.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/reset-controller.h>
 
 #include "clk-factors.h"
 
@@ -741,6 +742,59 @@ static void __init sunxi_divider_clk_setup(struct device_node *node,
 
 
 /**
+ * sunxi_gates_reset... - reset bits in leaf gate clk registers handling
+ */
+
+struct gates_reset_data {
+	void __iomem			*reg;
+	spinlock_t			*lock;
+	struct reset_controller_dev	rcdev;
+};
+
+static int sunxi_gates_reset_assert(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct gates_reset_data *data = container_of(rcdev,
+						     struct gates_reset_data,
+						     rcdev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(data->lock, flags);
+
+	reg = readl(data->reg);
+	writel(reg & ~BIT(id), data->reg);
+
+	spin_unlock_irqrestore(data->lock, flags);
+
+	return 0;
+}
+
+static int sunxi_gates_reset_deassert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	struct gates_reset_data *data = container_of(rcdev,
+						     struct gates_reset_data,
+						     rcdev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(data->lock, flags);
+
+	reg = readl(data->reg);
+	writel(reg | BIT(id), data->reg);
+
+	spin_unlock_irqrestore(data->lock, flags);
+
+	return 0;
+}
+
+static struct reset_control_ops sunxi_gates_reset_ops = {
+	.assert		= sunxi_gates_reset_assert,
+	.deassert	= sunxi_gates_reset_deassert,
+};
+
+/**
  * sunxi_gates_clk_setup() - Setup function for leaf gates on clocks
  */
 
@@ -748,6 +802,7 @@ static void __init sunxi_divider_clk_setup(struct device_node *node,
 
 struct gates_data {
 	DECLARE_BITMAP(mask, SUNXI_GATES_MAX_SIZE);
+	u32 reset_mask;
 };
 
 static const struct gates_data sun4i_axi_gates_data __initconst = {
@@ -818,6 +873,7 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
 					 struct gates_data *data)
 {
 	struct clk_onecell_data *clk_data;
+	struct gates_reset_data *reset_data;
 	const char *clk_parent;
 	const char *clk_name;
 	void *reg;
@@ -861,6 +917,21 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
 	clk_data->clk_num = i;
 
 	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
+
+	/* Register a reset controler for gates with reset bits */
+	if (data->reset_mask == 0)
+		return;
+
+	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
+	if (!reset_data)
+		return;
+
+	reset_data->reg = reg;
+	reset_data->lock = &clk_lock;
+	reset_data->rcdev.nr_resets = hweight32(data->reset_mask);
+	reset_data->rcdev.ops = &sunxi_gates_reset_ops;
+	reset_data->rcdev.of_node = node;
+	reset_controller_register(&reset_data->rcdev);
 }
 
 
-- 
1.8.5.3

[PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Hans de Goede]

From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Add register definitions for the usb-clk register found on sun4i, sun5i and
sun7i SoCs.

Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 Documentation/devicetree/bindings/clock/sunxi.txt |  5 +++++
 drivers/clk/sunxi/clk-sunxi.c                     | 12 ++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 79c7197..8bccb6a 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -37,6 +37,8 @@ Required properties:
 	"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
 	"allwinner,sun4i-mod0-clk" - for the module 0 family of clocks
 	"allwinner,sun7i-a20-out-clk" - for the external output clocks
+	"allwinner,sun4i-usb-gates-clk" - for usb gates + resets on A10 / A20
+	"allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
 
 Required properties for all clocks:
 - reg : shall be the control register address for the clock.
@@ -49,6 +51,9 @@ Required properties for all clocks:
 Additionally, "allwinner,*-gates-clk" clocks require:
 - clock-output-names : the corresponding gate names that the clock controls
 
+And "allwinner,*-usb-gates-clk" clocks also require:
+- reset-cells : shall be set to 1
+
 Clock consumers should specify the desired clocks they use with a
 "clocks" phandle cell. Consumers that are using a gated clock should
 provide an additional ID in their clock property. This ID is the
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index f1a147c..18cbc3c 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -813,6 +813,16 @@ static const struct gates_data sun4i_ahb_gates_data __initconst = {
 	.mask = {0x7F77FFF, 0x14FB3F},
 };
 
+static const struct gates_data sun4i_usb_gates_data __initconst = {
+	.mask = {0x1C0},
+	.reset_mask = 0x07,
+};
+
+static const struct gates_data sun5i_a13_usb_gates_data __initconst = {
+	.mask = {0x140},
+	.reset_mask = 0x03,
+};
+
 static const struct gates_data sun5i_a10s_ahb_gates_data __initconst = {
 	.mask = {0x147667e7, 0x185915},
 };
@@ -1159,6 +1169,8 @@ static const struct of_device_id clk_gates_match[] __initconst = {
 	{.compatible = "allwinner,sun6i-a31-apb1-gates-clk", .data = &sun6i_a31_apb1_gates_data,},
 	{.compatible = "allwinner,sun7i-a20-apb1-gates-clk", .data = &sun7i_a20_apb1_gates_data,},
 	{.compatible = "allwinner,sun6i-a31-apb2-gates-clk", .data = &sun6i_a31_apb2_gates_data,},
+	{.compatible = "allwinner,sun4i-usb-gates-clk", .data = &sun4i_usb_gates_data,},
+	{.compatible = "allwinner,sun5i-a13-usb-gates-clk", .data = &sun5i_a13_usb_gates_data,},
 	{}
 };
 
-- 
1.8.5.3

[PATCH v2 3/5] ARM: sun4i: dt: Add bindings for USB clocks

[Hans de Goede]

From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun4i-a10.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/sun4i-a10.dtsi b/arch/arm/boot/dts/sun4i-a10.dtsi
index 7264ef9..913674b 100644
--- a/arch/arm/boot/dts/sun4i-a10.dtsi
+++ b/arch/arm/boot/dts/sun4i-a10.dtsi
@@ -290,6 +290,15 @@
 			clock-output-names = "ir1";
 		};
 
+		usb_clk: clk@01c200cc {
+			#clock-cells = <1>;
+		        #reset-cells = <1>;
+			compatible = "allwinner,sun4i-usb-gates-clk";
+			reg = <0x01c200cc 0x4>;
+			clocks = <&pll6 1>;
+			clock-output-names = "usb_ohci0", "usb_ohci1", "usb_phy";
+		};
+
 		spi3_clk: clk@01c200d4 {
 			#clock-cells = <0>;
 			compatible = "allwinner,sun4i-mod0-clk";
-- 
1.8.5.3

[PATCH v2 4/5] ARM: sun5i: dt: Add bindings for USB clocks

[Hans de Goede]

From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun5i-a10s.dtsi | 9 +++++++++
 arch/arm/boot/dts/sun5i-a13.dtsi  | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/sun5i-a10s.dtsi b/arch/arm/boot/dts/sun5i-a10s.dtsi
index 9591959..44235e7 100644
--- a/arch/arm/boot/dts/sun5i-a10s.dtsi
+++ b/arch/arm/boot/dts/sun5i-a10s.dtsi
@@ -255,6 +255,15 @@
 			clock-output-names = "ir0";
 		};
 
+		usb_clk: clk@01c200cc {
+			#clock-cells = <1>;
+		        #reset-cells = <1>;
+			compatible = "allwinner,sun5i-a13-usb-gates-clk";
+			reg = <0x01c200cc 0x4>;
+			clocks = <&pll6 1>;
+			clock-output-names = "usb_ohci0", "usb_phy";
+		};
+
 		mbus_clk: clk@01c2015c {
 			#clock-cells = <0>;
 			compatible = "allwinner,sun4i-mod0-clk";
diff --git a/arch/arm/boot/dts/sun5i-a13.dtsi b/arch/arm/boot/dts/sun5i-a13.dtsi
index f6f2c81..4193fdf 100644
--- a/arch/arm/boot/dts/sun5i-a13.dtsi
+++ b/arch/arm/boot/dts/sun5i-a13.dtsi
@@ -252,6 +252,15 @@
 			clock-output-names = "ir0";
 		};
 
+		usb_clk: clk@01c200cc {
+			#clock-cells = <1>;
+		        #reset-cells = <1>;
+			compatible = "allwinner,sun5i-a13-usb-gates-clk";
+			reg = <0x01c200cc 0x4>;
+			clocks = <&pll6 1>;
+			clock-output-names = "usb_ohci0", "usb_phy";
+		};
+
 		mbus_clk: clk@01c2015c {
 			#clock-cells = <0>;
 			compatible = "allwinner,sun4i-mod0-clk";
-- 
1.8.5.3

[PATCH v2 5/5] ARM: sun7i: dt: Add bindings for USB clocks

[Hans de Goede]

From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun7i-a20.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
index 57f1fc9..a44b3b3 100644
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -280,6 +280,15 @@
 			clock-output-names = "ir1";
 		};
 
+		usb_clk: clk@01c200cc {
+			#clock-cells = <1>;
+		        #reset-cells = <1>;
+			compatible = "allwinner,sun4i-usb-gates-clk";
+			reg = <0x01c200cc 0x4>;
+			clocks = <&pll6 1>;
+			clock-output-names = "usb_ohci0", "usb_ohci1", "usb_phy";
+		};
+
 		spi3_clk: clk@01c200d4 {
 			#clock-cells = <0>;
 			compatible = "allwinner,sun4i-mod0-clk";
-- 
1.8.5.3

Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Maxime Ripard]

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Hi Hans,

Mostly looking good, but I have a few comments below.

On Wed, Jan 22, 2014 at 10:36:24PM +0100, Hans de Goede wrote:
> From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
> Add register definitions for the usb-clk register found on sun4i, sun5i and
> sun7i SoCs.
> 
> Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/clock/sunxi.txt |  5 +++++
>  drivers/clk/sunxi/clk-sunxi.c                     | 12 ++++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
> index 79c7197..8bccb6a 100644
> --- a/Documentation/devicetree/bindings/clock/sunxi.txt
> +++ b/Documentation/devicetree/bindings/clock/sunxi.txt
> @@ -37,6 +37,8 @@ Required properties:
>  	"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
>  	"allwinner,sun4i-mod0-clk" - for the module 0 family of clocks
>  	"allwinner,sun7i-a20-out-clk" - for the external output clocks
> +	"allwinner,sun4i-usb-gates-clk" - for usb gates + resets on A10 / A20
> +	"allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13

Maybe we can just remove the gates from there? Even though they are
gates, they are also (a bit) more than that.

>  Required properties for all clocks:
>  - reg : shall be the control register address for the clock.
> @@ -49,6 +51,9 @@ Required properties for all clocks:
>  Additionally, "allwinner,*-gates-clk" clocks require:
>  - clock-output-names : the corresponding gate names that the clock controls
>  
> +And "allwinner,*-usb-gates-clk" clocks also require:
> +- reset-cells : shall be set to 1
> +

You should also document what value we should put in the cells, and
where to refer to to find the right one.

>  Clock consumers should specify the desired clocks they use with a
>  "clocks" phandle cell. Consumers that are using a gated clock should
>  provide an additional ID in their clock property. This ID is the
> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
> index f1a147c..18cbc3c 100644
> --- a/drivers/clk/sunxi/clk-sunxi.c
> +++ b/drivers/clk/sunxi/clk-sunxi.c
> @@ -813,6 +813,16 @@ static const struct gates_data sun4i_ahb_gates_data __initconst = {
>  	.mask = {0x7F77FFF, 0x14FB3F},
>  };
>  
> +static const struct gates_data sun4i_usb_gates_data __initconst = {
> +	.mask = {0x1C0},
> +	.reset_mask = 0x07,
> +};
> +
> +static const struct gates_data sun5i_a13_usb_gates_data __initconst = {
> +	.mask = {0x140},
> +	.reset_mask = 0x03,
> +};
> +

I guess that means that we will have the OHCI0 gate declared with
<&...-gates-clk 6>, while it's actually the first gate for this clock?

Maybe introducing an offset field in the gates_data would be a good
idea, so that we always start from indexing the gates from 0 in the DT?

>  static const struct gates_data sun5i_a10s_ahb_gates_data __initconst = {
>  	.mask = {0x147667e7, 0x185915},
>  };
> @@ -1159,6 +1169,8 @@ static const struct of_device_id clk_gates_match[] __initconst = {
>  	{.compatible = "allwinner,sun6i-a31-apb1-gates-clk", .data = &sun6i_a31_apb1_gates_data,},
>  	{.compatible = "allwinner,sun7i-a20-apb1-gates-clk", .data = &sun7i_a20_apb1_gates_data,},
>  	{.compatible = "allwinner,sun6i-a31-apb2-gates-clk", .data = &sun6i_a31_apb2_gates_data,},
> +	{.compatible = "allwinner,sun4i-usb-gates-clk", .data = &sun4i_usb_gates_data,},
> +	{.compatible = "allwinner,sun5i-a13-usb-gates-clk", .data = &sun5i_a13_usb_gates_data,},
>  	{}
>  };

Thanks a lot!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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Re: [PATCH v2 0/5] clk: sunxi: Add support for USB clocks and reset bits

[Maxime Ripard]

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On Wed, Jan 22, 2014 at 10:36:22PM +0100, Hans de Goede wrote:
> Hi Emilio, Maxime, et al,
> 
> Emilio, here is v2 of my patch-set adding support for sunxi-clk USB clocks and
> reset bits. This addresses all your review comments from v1.
> 
> Can you add the first 2 patches to your queue of patches for Mike for 3.15 ?
> 
> Maxime, can you add patch 3-5 which add the dt bindings for this to your
> tree please ?

Apart from the comments I had on patch 2, it looks good for me. Once
we agree on something, you have my Acked-by.

Thanks for working on this!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Hans de Goede]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

On 01/27/2014 03:43 PM, Maxime Ripard wrote:
> Hi Hans,
> 
> Mostly looking good, but I have a few comments below.
> 
> On Wed, Jan 22, 2014 at 10:36:24PM +0100, Hans de Goede wrote:
>> From: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> 
>> Add register definitions for the usb-clk register found on sun4i, sun5i and sun7i SoCs.
>> 
>> Signed-off-by: Roman Byshko <rbyshko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> --- Documentation/devicetree/bindings/clock/sunxi.txt |  5 +++++ drivers/clk/sunxi/clk-sunxi.c                     | 12 ++++++++++++ 2 files changed, 17 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index 79c7197..8bccb6a 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -37,6 +37,8 @@ Required properties: "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31 "allwinner,sun4i-mod0-clk" - for the module 0 family of clocks "allwinner,sun7i-a20-out-clk" - for the external output clocks +	"allwinner,sun4i-usb-gates-clk" - for usb gates + resets on A10 / A20 +
>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
> 
> Maybe we can just remove the gates from there? Even though they are gates, they are also (a bit) more than that.

To be clear you mean s/usb-gates-clk/usb-clk/ right ?

That sounds reasonable :)

> 
>> Required properties for all clocks: - reg : shall be the control register address for the clock. @@ -49,6 +51,9 @@ Required properties for all clocks: Additionally, "allwinner,*-gates-clk" clocks require: - clock-output-names : the corresponding gate names that the clock controls
>> 
>> +And "allwinner,*-usb-gates-clk" clocks also require: +- reset-cells : shall be set to 1 +
> 
> You should also document what value we should put in the cells, and where to refer to to find the right one.

Ok.

> 
>> Clock consumers should specify the desired clocks they use with a "clocks" phandle cell. Consumers that are using a gated clock should provide an additional ID in their clock property. This ID is the diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index f1a147c..18cbc3c 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -813,6 +813,16 @@ static const struct gates_data sun4i_ahb_gates_data __initconst = { .mask = {0x7F77FFF, 0x14FB3F}, };
>> 
>> +static const struct gates_data sun4i_usb_gates_data __initconst = { +	.mask = {0x1C0}, +	.reset_mask = 0x07, +}; + +static const struct gates_data sun5i_a13_usb_gates_data __initconst = { +	.mask = {0x140}, +	.reset_mask = 0x03, +}; +
> 
> I guess that means that we will have the OHCI0 gate declared with <&...-gates-clk 6>, while it's actually the first gate for this clock?

Correct.

> Maybe introducing an offset field in the gates_data would be a good idea, so that we always start from indexing the gates from 0 in the DT?

Well for the other "gates" type clks we also have holes in the range, and
we always refer to the clk with the bit number in the reg as the clock-cell
value.

Here the hole just happens to be at the start, but it seems best to me
to be consistent and keep using the bit nr inside the reg as clock-cell
value, without an offset.

> 
>> static const struct gates_data sun5i_a10s_ahb_gates_data __initconst = { .mask = {0x147667e7, 0x185915}, }; @@ -1159,6 +1169,8 @@ static const struct of_device_id clk_gates_match[] __initconst = { {.compatible = "allwinner,sun6i-a31-apb1-gates-clk", .data = &sun6i_a31_apb1_gates_data,}, {.compatible = "allwinner,sun7i-a20-apb1-gates-clk", .data = &sun7i_a20_apb1_gates_data,}, {.compatible = "allwinner,sun6i-a31-apb2-gates-clk", .data = &sun6i_a31_apb2_gates_data,}, +	{.compatible = "allwinner,sun4i-usb-gates-clk", .data = &sun4i_usb_gates_data,}, +	{.compatible =
>> "allwinner,sun5i-a13-usb-gates-clk", .data = &sun5i_a13_usb_gates_data,}, {} };
> 
> Thanks a lot! Maxime

Regards,

Hans

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1279 bytes --]

On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
> >> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
> > 
> > Maybe we can just remove the gates from there? Even though they
> > are gates, they are also (a bit) more than that.
> 
> To be clear you mean s/usb-gates-clk/usb-clk/ right ?

Yep, exactly

> > I guess that means that we will have the OHCI0 gate declared with
> > <&...-gates-clk 6>, while it's actually the first gate for this
> > clock?
> 
> Correct.
> 
> > Maybe introducing an offset field in the gates_data would be a
> > good idea, so that we always start from indexing the gates from 0
> > in the DT?
> 
> Well for the other "gates" type clks we also have holes in the
> range, and we always refer to the clk with the bit number in the reg
> as the clock-cell value.

Yes, we have holes, but I see two majors differences here:
  - the other gates are just gates, while the usb clocks are a bit
    more than that.
  - the other gates' gating bits thus all start at bit 0, while here,
    since it's kind of a "mixed" clock, the gating bits start at bit 6
    (on the A20 at least)


-- 
Maxime Ripard, Free Electrons
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http://free-electrons.com

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Hans de Goede]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

On 01/28/2014 10:44 AM, Maxime Ripard wrote:
> On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
>>>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
>>> 
>>> Maybe we can just remove the gates from there? Even though they are gates, they are also (a bit) more than that.
>> 
>> To be clear you mean s/usb-gates-clk/usb-clk/ right ?
> 
> Yep, exactly
> 
>>> I guess that means that we will have the OHCI0 gate declared with <&...-gates-clk 6>, while it's actually the first gate for this clock?
>> 
>> Correct.
>> 
>>> Maybe introducing an offset field in the gates_data would be a good idea, so that we always start from indexing the gates from 0 in the DT?
>> 
>> Well for the other "gates" type clks we also have holes in the range, and we always refer to the clk with the bit number in the reg as the clock-cell value.
> 
> Yes, we have holes, but I see two majors differences here: - the other gates are just gates, while the usb clocks are a bit more than that.

The usb-clk registers contain more then that, but the bits we are talking
about now are gates.

> - the other gates' gating bits thus all start at bit 0, while here, since it's kind of a "mixed" clock, the gating bits start at bit 6 (on the A20 at least)

Right, still I believe that the consistent thing to do is keeping the
bit-number for the bit in the register controlling the gate as the
specifier.  When adding new dts entries / reviewing existing ones
I'm used to matching the specifier to the bit-nr in the data-sheet,
I think making things different just for this one register is counter
productive.

Regards,

Hans

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Re: [PATCH v2 1/5] clk: sunxi: Add support for USB clock-register reset bits

[Emilio López]

Hi Hans,

El 22/01/14 18:36, Hans de Goede escribió:
> The usb-clk register is special in that it not only contains clk gate bits,
> but also has a few reset bits. This commit adds support for this by allowing
> gates type sunxi clks to also register a reset controller.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
(snip)
>   static const struct gates_data sun4i_axi_gates_data __initconst = {
> @@ -818,6 +873,7 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
>   					 struct gates_data *data)
>   {
>   	struct clk_onecell_data *clk_data;
> +	struct gates_reset_data *reset_data;
>   	const char *clk_parent;
>   	const char *clk_name;
>   	void *reg;
> @@ -861,6 +917,21 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
>   	clk_data->clk_num = i;
>
>   	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
> +
> +	/* Register a reset controler for gates with reset bits */
> +	if (data->reset_mask == 0)
> +		return;
> +
> +	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
> +	if (!reset_data)
> +		return;
> +
> +	reset_data->reg = reg;
> +	reset_data->lock = &clk_lock;
> +	reset_data->rcdev.nr_resets = hweight32(data->reset_mask);

I know I made you change this, but after having a second look into 
nr_resets, I think your original implementation makes more sense. This 
will break if you use a mask with holes on it. Sorry :(

> +	reset_data->rcdev.ops = &sunxi_gates_reset_ops;
> +	reset_data->rcdev.of_node = node;
> +	reset_controller_register(&reset_data->rcdev);
>   }

Emilio

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 2289 bytes --]

Hi Hans,

On Tue, Jan 28, 2014 at 11:00:45AM +0100, Hans de Goede wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 
> On 01/28/2014 10:44 AM, Maxime Ripard wrote:
> > On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
> >>>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
> >>> 
> >>> Maybe we can just remove the gates from there? Even though they
> >>> are gates, they are also (a bit) more than that.
> >> 
> >> To be clear you mean s/usb-gates-clk/usb-clk/ right ?
> > 
> > Yep, exactly
> > 
> >>> I guess that means that we will have the OHCI0 gate declared
> >>> with <&...-gates-clk 6>, while it's actually the first gate for
> >>> this clock?
> >> 
> >> Correct.
> >> 
> >>> Maybe introducing an offset field in the gates_data would be a
> >>> good idea, so that we always start from indexing the gates from
> >>> 0 in the DT?
> >> 
> >> Well for the other "gates" type clks we also have holes in the
> >> range, and we always refer to the clk with the bit number in the
> >> reg as the clock-cell value.
> > 
> > Yes, we have holes, but I see two majors differences here: - the
> > other gates are just gates, while the usb clocks are a bit more
> > than that.
> 
> The usb-clk registers contain more then that, but the bits we are
> talking about now are gates.
> 
> > - the other gates' gating bits thus all start at bit 0, while
> > - here, since it's kind of a "mixed" clock, the gating bits start
> > - at bit 6 (on the A20 at least)
> 
> Right, still I believe that the consistent thing to do is keeping
> the bit-number for the bit in the register controlling the gate as
> the specifier.  When adding new dts entries / reviewing existing
> ones I'm used to matching the specifier to the bit-nr in the
> data-sheet, I think making things different just for this one
> register is counter productive.

And if you turn it the other way around, it would be inconsistent that
all gates indices start at 0, and we would start at 6 here :)

Plus, this clock is already a special case, since it's the only gate
that is more than just a gate so far.

Maxime

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Hans de Goede]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

On 02/04/2014 10:40 AM, Maxime Ripard wrote:
> Hi Hans,
> 
> On Tue, Jan 28, 2014 at 11:00:45AM +0100, Hans de Goede wrote:
>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>> 
>> Hi,
>> 
>> On 01/28/2014 10:44 AM, Maxime Ripard wrote:
>>> On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
>>>>>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
>>>>> 
>>>>> Maybe we can just remove the gates from there? Even though they are gates, they are also (a bit) more than that.
>>>> 
>>>> To be clear you mean s/usb-gates-clk/usb-clk/ right ?
>>> 
>>> Yep, exactly
>>> 
>>>>> I guess that means that we will have the OHCI0 gate declared with <&...-gates-clk 6>, while it's actually the first gate for this clock?
>>>> 
>>>> Correct.
>>>> 
>>>>> Maybe introducing an offset field in the gates_data would be a good idea, so that we always start from indexing the gates from 0 in the DT?
>>>> 
>>>> Well for the other "gates" type clks we also have holes in the range, and we always refer to the clk with the bit number in the reg as the clock-cell value.
>>> 
>>> Yes, we have holes, but I see two majors differences here: - the other gates are just gates, while the usb clocks are a bit more than that.
>> 
>> The usb-clk registers contain more then that, but the bits we are talking about now are gates.
>> 
>>> - the other gates' gating bits thus all start at bit 0, while - here, since it's kind of a "mixed" clock, the gating bits start - at bit 6 (on the A20 at least)
>> 
>> Right, still I believe that the consistent thing to do is keeping the bit-number for the bit in the register controlling the gate as the specifier.  When adding new dts entries / reviewing existing ones I'm used to matching the specifier to the bit-nr in the data-sheet, I think making things different just for this one register is counter productive.
> 
> And if you turn it the other way around, it would be inconsistent that all gates indices start at 0, and we would start at 6 here :)

I think the problem here is that you see the specifier part of the clk
phandle as an index, which it is not. All devicetree docs / code talks
about specifiers or arguments not indexes. Once you stop seeing this as
an index, you will hopefully also stop insisting this needs to
start at 0 :)

Also note that it already is not an index for existing sunxi clks which have
cells != 0, as there are holes in the bits used in the gates registers and
calling the specifier an index suggest we're dealing with an array, and
arrays never have holes.

The clk specifier as currently used in sunxi clks is a 1:1 mapping of the
gate register bit numbers, as is clearly documented in ie:
Documentation/devicetree/bindings/clock/sunxi/sun4i-a10-gates.txt
Where the datasheet is referenced as the source for (most) of the values
to put in the specifier.

My biggest objection is that this would loose 1:1 mapping we currently
have between the specifier and bit-nr in the register, which really is
convenient when writing new dts bindings.

When we add an offset users will need to first lookup which clk they need in
the datasheet and then look at both the dts bindings doc to find how this is
mapped to the specifier. In my experience such an extra level of indirection
in documentation is a PITA, and all that just so that some random number
(it is not an index!) can start at 0 ?

To me adding an offset here and making the clk gates different form all
our other clock gates just feels wrong.

Regards,

Hans
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Re: [PATCH v2 1/5] clk: sunxi: Add support for USB clock-register reset bits

[Hans de Goede]

Hi,

On 01/28/2014 08:38 PM, Emilio López wrote:
> Hi Hans,
>
> El 22/01/14 18:36, Hans de Goede escribió:
>> The usb-clk register is special in that it not only contains clk gate bits,
>> but also has a few reset bits. This commit adds support for this by allowing
>> gates type sunxi clks to also register a reset controller.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
> (snip)
>>   static const struct gates_data sun4i_axi_gates_data __initconst = {
>> @@ -818,6 +873,7 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
>>                        struct gates_data *data)
>>   {
>>       struct clk_onecell_data *clk_data;
>> +    struct gates_reset_data *reset_data;
>>       const char *clk_parent;
>>       const char *clk_name;
>>       void *reg;
>> @@ -861,6 +917,21 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
>>       clk_data->clk_num = i;
>>
>>       of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
>> +
>> +    /* Register a reset controler for gates with reset bits */
>> +    if (data->reset_mask == 0)
>> +        return;
>> +
>> +    reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
>> +    if (!reset_data)
>> +        return;
>> +
>> +    reset_data->reg = reg;
>> +    reset_data->lock = &clk_lock;
>> +    reset_data->rcdev.nr_resets = hweight32(data->reset_mask);
>
> I know I made you change this, but after having a second look into nr_resets, I think your original implementation makes more sense. This will break if you use a mask with holes on it. Sorry :(

No problem, just changed it back :)

Regards,

Hans

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 4054 bytes --]

On Tue, Feb 04, 2014 at 11:14:44AM +0100, Hans de Goede wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 
> On 02/04/2014 10:40 AM, Maxime Ripard wrote:
> > Hi Hans,
> > 
> > On Tue, Jan 28, 2014 at 11:00:45AM +0100, Hans de Goede wrote:
> >> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >> 
> >> Hi,
> >> 
> >> On 01/28/2014 10:44 AM, Maxime Ripard wrote:
> >>> On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
> >>>>>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
> >>>>> 
> >>>>> Maybe we can just remove the gates from there? Even though they are gates, they are also (a bit) more than that.
> >>>> 
> >>>> To be clear you mean s/usb-gates-clk/usb-clk/ right ?
> >>> 
> >>> Yep, exactly
> >>> 
> >>>>> I guess that means that we will have the OHCI0 gate declared with <&...-gates-clk 6>, while it's actually the first gate for this clock?
> >>>> 
> >>>> Correct.
> >>>> 
> >>>>> Maybe introducing an offset field in the gates_data would be a good idea, so that we always start from indexing the gates from 0 in the DT?
> >>>> 
> >>>> Well for the other "gates" type clks we also have holes in the range, and we always refer to the clk with the bit number in the reg as the clock-cell value.
> >>> 
> >>> Yes, we have holes, but I see two majors differences here: - the other gates are just gates, while the usb clocks are a bit more than that.
> >> 
> >> The usb-clk registers contain more then that, but the bits we are talking about now are gates.
> >> 
> >>> - the other gates' gating bits thus all start at bit 0, while - here, since it's kind of a "mixed" clock, the gating bits start - at bit 6 (on the A20 at least)
> >> 
> >> Right, still I believe that the consistent thing to do is keeping the bit-number for the bit in the register controlling the gate as the specifier.  When adding new dts entries / reviewing existing ones I'm used to matching the specifier to the bit-nr in the data-sheet, I think making things different just for this one register is counter productive.
> > 
> > And if you turn it the other way around, it would be inconsistent that all gates indices start at 0, and we would start at 6 here :)
> 
> I think the problem here is that you see the specifier part of the clk
> phandle as an index, which it is not. All devicetree docs / code talks
> about specifiers or arguments not indexes. Once you stop seeing this as
> an index, you will hopefully also stop insisting this needs to
> start at 0 :)
> 
> Also note that it already is not an index for existing sunxi clks which have
> cells != 0, as there are holes in the bits used in the gates registers and
> calling the specifier an index suggest we're dealing with an array, and
> arrays never have holes.
> 
> The clk specifier as currently used in sunxi clks is a 1:1 mapping of the
> gate register bit numbers, as is clearly documented in ie:
> Documentation/devicetree/bindings/clock/sunxi/sun4i-a10-gates.txt
> Where the datasheet is referenced as the source for (most) of the values
> to put in the specifier.
> 
> My biggest objection is that this would loose 1:1 mapping we currently
> have between the specifier and bit-nr in the register, which really is
> convenient when writing new dts bindings.
> 
> When we add an offset users will need to first lookup which clk they need in
> the datasheet and then look at both the dts bindings doc to find how this is
> mapped to the specifier. In my experience such an extra level of indirection
> in documentation is a PITA, and all that just so that some random number
> (it is not an index!) can start at 0 ?
> 
> To me adding an offset here and making the clk gates different form all
> our other clock gates just feels wrong.

Emilio pretty much share your feeling. I won't get in the way then :)

I only had the compatible name comment left then.

Maxime

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Re: [PATCH v2 2/5] clk: sunxi: Add USB clock register defintions

[Hans de Goede]

Hi,

On 02/07/2014 02:48 PM, Maxime Ripard wrote:
> On Tue, Feb 04, 2014 at 11:14:44AM +0100, Hans de Goede wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hi,
>>
>> On 02/04/2014 10:40 AM, Maxime Ripard wrote:
>>> Hi Hans,
>>>
>>> On Tue, Jan 28, 2014 at 11:00:45AM +0100, Hans de Goede wrote:
>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>>>>
>>>> Hi,
>>>>
>>>> On 01/28/2014 10:44 AM, Maxime Ripard wrote:
>>>>> On Mon, Jan 27, 2014 at 03:54:14PM +0100, Hans de Goede wrote:
>>>>>>>> "allwinner,sun5i-a13-usb-gates-clk" - for usb gates + resets on A13
>>>>>>>
>>>>>>> Maybe we can just remove the gates from there? Even though they are gates, they are also (a bit) more than that.
>>>>>>
>>>>>> To be clear you mean s/usb-gates-clk/usb-clk/ right ?
>>>>>
>>>>> Yep, exactly
>>>>>
>>>>>>> I guess that means that we will have the OHCI0 gate declared with <&...-gates-clk 6>, while it's actually the first gate for this clock?
>>>>>>
>>>>>> Correct.
>>>>>>
>>>>>>> Maybe introducing an offset field in the gates_data would be a good idea, so that we always start from indexing the gates from 0 in the DT?
>>>>>>
>>>>>> Well for the other "gates" type clks we also have holes in the range, and we always refer to the clk with the bit number in the reg as the clock-cell value.
>>>>>
>>>>> Yes, we have holes, but I see two majors differences here: - the other gates are just gates, while the usb clocks are a bit more than that.
>>>>
>>>> The usb-clk registers contain more then that, but the bits we are talking about now are gates.
>>>>
>>>>> - the other gates' gating bits thus all start at bit 0, while - here, since it's kind of a "mixed" clock, the gating bits start - at bit 6 (on the A20 at least)
>>>>
>>>> Right, still I believe that the consistent thing to do is keeping the bit-number for the bit in the register controlling the gate as the specifier.  When adding new dts entries / reviewing existing ones I'm used to matching the specifier to the bit-nr in the data-sheet, I think making things different just for this one register is counter productive.
>>>
>>> And if you turn it the other way around, it would be inconsistent that all gates indices start at 0, and we would start at 6 here :)
>>
>> I think the problem here is that you see the specifier part of the clk
>> phandle as an index, which it is not. All devicetree docs / code talks
>> about specifiers or arguments not indexes. Once you stop seeing this as
>> an index, you will hopefully also stop insisting this needs to
>> start at 0 :)
>>
>> Also note that it already is not an index for existing sunxi clks which have
>> cells != 0, as there are holes in the bits used in the gates registers and
>> calling the specifier an index suggest we're dealing with an array, and
>> arrays never have holes.
>>
>> The clk specifier as currently used in sunxi clks is a 1:1 mapping of the
>> gate register bit numbers, as is clearly documented in ie:
>> Documentation/devicetree/bindings/clock/sunxi/sun4i-a10-gates.txt
>> Where the datasheet is referenced as the source for (most) of the values
>> to put in the specifier.
>>
>> My biggest objection is that this would loose 1:1 mapping we currently
>> have between the specifier and bit-nr in the register, which really is
>> convenient when writing new dts bindings.
>>
>> When we add an offset users will need to first lookup which clk they need in
>> the datasheet and then look at both the dts bindings doc to find how this is
>> mapped to the specifier. In my experience such an extra level of indirection
>> in documentation is a PITA, and all that just so that some random number
>> (it is not an index!) can start at 0 ?
>>
>> To me adding an offset here and making the clk gates different form all
>> our other clock gates just feels wrong.
>
> Emilio pretty much share your feeling. I won't get in the way then :)
>
> I only had the compatible name comment left then.

Yes I've already fixed that in my latest sunxi-devel tree:
https://github.com/linux-sunxi/linux-sunxi/commits/sunxi-devel

Which is also rebased to 3.14-rc1 for those interested, I'll resend
the usb-clk patches with this + Emilio's reverted remark fixed soon-ish
then.

Regards,

Hans

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