[PATCH 0/7] clk: at91: rework sckc bindings

[PATCH 0/7] clk: at91: rework sckc bindings

[Alexandre Belloni]

Hi,

This is a rework of the sckc DT bindings to avoid warnings with dtc.
DT backward compatibility is kept.

This series also fix a possible issue with the sama5d3 slow RC
oscillator.

The sckc driver changes and documetation can go through the clk tree and
we will handle th DT changes.

Alexandre Belloni (7):
  dt-bindings: clock: at91: new sckc bindings
  clk: at91: modernize sckc binding
  clk: at91: sckc: handle different RC startup time
  ARM: dts: at91: at91sam9x5: switch to new sckc bindings
  ARM: dts: at91: at91sam9g45: switch to new sckc bindings
  ARM: dts: at91: at91sam9rl: switch to new sckc bindings
  ARM: dts: at91: sama5d3: switch to new sckc bindings

 .../devicetree/bindings/clock/at91-clock.txt  |  30 ++--
 arch/arm/boot/dts/at91-wb50n.dtsi             |   2 +-
 arch/arm/boot/dts/at91sam9g45.dtsi            |  25 +---
 arch/arm/boot/dts/at91sam9rl.dtsi             |  25 +---
 arch/arm/boot/dts/at91sam9x5.dtsi             |  23 +--
 arch/arm/boot/dts/sama5d3.dtsi                |  27 +---
 drivers/clk/at91/sckc.c                       | 134 ++++++------------
 7 files changed, 73 insertions(+), 193 deletions(-)

-- 
2.20.1


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[PATCH 1/7] dt-bindings: clock: at91: new sckc bindings

[Alexandre Belloni]

Remove the need for child nodes in the sckc binding to be able to remove
dtc warnings and have a more modern binding.

Also document optional properties.

Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 .../devicetree/bindings/clock/at91-clock.txt  | 30 ++++++++-----------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/at91-clock.txt b/Documentation/devicetree/bindings/clock/at91-clock.txt
index e9f70fcdfe80..cb838c1c4bdd 100644
--- a/Documentation/devicetree/bindings/clock/at91-clock.txt
+++ b/Documentation/devicetree/bindings/clock/at91-clock.txt
@@ -8,29 +8,23 @@ Slow Clock controller:
 
 Required properties:
 - compatible : shall be one of the following:
-	"atmel,at91sam9x5-sckc" or
+	"atmel,at91sam9x5-sckc",
+	"atmel,sama5d3-sckc" or
 	"atmel,sama5d4-sckc":
 		at91 SCKC (Slow Clock Controller)
-		This node contains the slow clock definitions.
-
-	"atmel,at91sam9x5-clk-slow-osc":
-		at91 slow oscillator
-
-	"atmel,at91sam9x5-clk-slow-rc-osc":
-		at91 internal slow RC oscillator
-- reg : defines the IO memory reserved for the SCKC.
-- #size-cells : shall be 0 (reg is used to encode clk id).
-- #address-cells : shall be 1 (reg is used to encode clk id).
+- #clock-cells : shall be 0.
+- clocks : shall be the input parent clock phandle for the clock.
 
+Optional properties:
+- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
+  provided on XIN.
 
 For example:
-	sckc: sckc@fffffe50 {
-		compatible = "atmel,sama5d3-pmc";
-		reg = <0xfffffe50 0x4>
-		#size-cells = <0>;
-		#address-cells = <1>;
-
-		/* put at91 slow clocks here */
+	sckc@fffffe50 {
+		compatible = "atmel,at91sam9x5-sckc";
+		reg = <0xfffffe50 0x4>;
+		clocks = <&slow_xtal>;
+		#clock-cells = <0>;
 	};
 
 Power Management Controller (PMC):
-- 
2.20.1


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[PATCH 2/7] clk: at91: modernize sckc binding

[Alexandre Belloni]

Remove the need for child nodes in the sckc binding and register the whole
sckc tree (3 clocks in total) from the sckc node.

DT backward compatibility is kept by looking for properties in child nodes
when they are not present in the sckc node.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 drivers/clk/at91/sckc.c | 125 ++++++++++++----------------------------
 1 file changed, 36 insertions(+), 89 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index ab6ecefc49ad..470aef586f57 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -152,28 +152,6 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
 	return hw;
 }
 
-static void __init
-of_at91sam9x5_clk_slow_osc_setup(struct device_node *np, void __iomem *sckcr)
-{
-	struct clk_hw *hw;
-	const char *parent_name;
-	const char *name = np->name;
-	u32 startup;
-	bool bypass;
-
-	parent_name = of_clk_get_parent_name(np, 0);
-	of_property_read_string(np, "clock-output-names", &name);
-	of_property_read_u32(np, "atmel,startup-time-usec", &startup);
-	bypass = of_property_read_bool(np, "atmel,osc-bypass");
-
-	hw = at91_clk_register_slow_osc(sckcr, name, parent_name, startup,
-					 bypass);
-	if (IS_ERR(hw))
-		return;
-
-	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
-}
-
 static unsigned long clk_slow_rc_osc_recalc_rate(struct clk_hw *hw,
 						 unsigned long parent_rate)
 {
@@ -266,28 +244,6 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,
 	return hw;
 }
 
-static void __init
-of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np, void __iomem *sckcr)
-{
-	struct clk_hw *hw;
-	u32 frequency = 0;
-	u32 accuracy = 0;
-	u32 startup = 0;
-	const char *name = np->name;
-
-	of_property_read_string(np, "clock-output-names", &name);
-	of_property_read_u32(np, "clock-frequency", &frequency);
-	of_property_read_u32(np, "clock-accuracy", &accuracy);
-	of_property_read_u32(np, "atmel,startup-time-usec", &startup);
-
-	hw = at91_clk_register_slow_rc_osc(sckcr, name, frequency, accuracy,
-					    startup);
-	if (IS_ERR(hw))
-		return;
-
-	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
-}
-
 static int clk_sam9x5_slow_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
@@ -365,64 +321,55 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
 	return hw;
 }
 
-static void __init
-of_at91sam9x5_clk_slow_setup(struct device_node *np, void __iomem *sckcr)
+static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
 {
+	const char *parent_names[2] = { "slow_rc_osc", "slow_osc" };
+	void __iomem *regbase = of_iomap(np, 0);
+	struct device_node *child = NULL;
+	const char *xtal_name;
 	struct clk_hw *hw;
-	const char *parent_names[2];
-	unsigned int num_parents;
-	const char *name = np->name;
+	bool bypass;
 
-	num_parents = of_clk_get_parent_count(np);
-	if (num_parents == 0 || num_parents > 2)
+	if (!regbase)
 		return;
 
-	of_clk_parent_fill(np, parent_names, num_parents);
-
-	of_property_read_string(np, "clock-output-names", &name);
-
-	hw = at91_clk_register_sam9x5_slow(sckcr, name, parent_names,
-					    num_parents);
+	hw = at91_clk_register_slow_rc_osc(regbase, parent_names[0], 32768,
+					   50000000, 75);
 	if (IS_ERR(hw))
 		return;
 
-	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
-}
+	xtal_name = of_clk_get_parent_name(np, 0);
+	if (!xtal_name) {
+		/* DT backward compatibility */
+		child = of_get_compatible_child(np, "atmel,at91sam9x5-clk-slow-osc");
+		if (!child)
+			return;
+
+		xtal_name = of_clk_get_parent_name(child, 0);
+		bypass = of_property_read_bool(child, "atmel,osc-bypass");
+
+		child =  of_get_compatible_child(np, "atmel,at91sam9x5-clk-slow");
+	} else {
+		bypass = of_property_read_bool(np, "atmel,osc-bypass");
+	}
 
-static const struct of_device_id sckc_clk_ids[] __initconst = {
-	/* Slow clock */
-	{
-		.compatible = "atmel,at91sam9x5-clk-slow-osc",
-		.data = of_at91sam9x5_clk_slow_osc_setup,
-	},
-	{
-		.compatible = "atmel,at91sam9x5-clk-slow-rc-osc",
-		.data = of_at91sam9x5_clk_slow_rc_osc_setup,
-	},
-	{
-		.compatible = "atmel,at91sam9x5-clk-slow",
-		.data = of_at91sam9x5_clk_slow_setup,
-	},
-	{ /*sentinel*/ }
-};
+	if (!xtal_name)
+		return;
 
-static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
-{
-	struct device_node *childnp;
-	void (*clk_setup)(struct device_node *, void __iomem *);
-	const struct of_device_id *clk_id;
-	void __iomem *regbase = of_iomap(np, 0);
+	hw = at91_clk_register_slow_osc(regbase, parent_names[1], xtal_name,
+					1200000, bypass);
+	if (IS_ERR(hw))
+		return;
 
-	if (!regbase)
+	hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2);
+	if (IS_ERR(hw))
 		return;
 
-	for_each_child_of_node(np, childnp) {
-		clk_id = of_match_node(sckc_clk_ids, childnp);
-		if (!clk_id)
-			continue;
-		clk_setup = clk_id->data;
-		clk_setup(childnp, regbase);
-	}
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+
+	/* DT backward compatibility */
+	if (child)
+		of_clk_add_hw_provider(child, of_clk_hw_simple_get, hw);
 }
 CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
 	       of_at91sam9x5_sckc_setup);
-- 
2.20.1


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[PATCH 3/7] clk: at91: sckc: handle different RC startup time

[Alexandre Belloni]

The sama5d3 slow RC oscillator as a different startup time than all the
previous SoCs. Handle that using its own compatible.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 drivers/clk/at91/sckc.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 470aef586f57..e76b1d64e905 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -321,7 +321,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
 	return hw;
 }
 
-static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
+static void __init at91sam9x5_sckc_register(struct device_node *np,
+					    unsigned int rc_osc_startup_us)
 {
 	const char *parent_names[2] = { "slow_rc_osc", "slow_osc" };
 	void __iomem *regbase = of_iomap(np, 0);
@@ -334,7 +335,7 @@ static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
 		return;
 
 	hw = at91_clk_register_slow_rc_osc(regbase, parent_names[0], 32768,
-					   50000000, 75);
+					   50000000, rc_osc_startup_us);
 	if (IS_ERR(hw))
 		return;
 
@@ -371,9 +372,21 @@ static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
 	if (child)
 		of_clk_add_hw_provider(child, of_clk_hw_simple_get, hw);
 }
+
+static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
+{
+	at91sam9x5_sckc_register(np, 75);
+}
 CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
 	       of_at91sam9x5_sckc_setup);
 
+static void __init of_sama5d3_sckc_setup(struct device_node *np)
+{
+	at91sam9x5_sckc_register(np, 500);
+}
+CLK_OF_DECLARE(sama5d3_clk_sckc, "atmel,sama5d3-sckc",
+	       of_sama5d3_sckc_setup);
+
 static int clk_sama5d4_slow_osc_prepare(struct clk_hw *hw)
 {
 	struct clk_sama5d4_slow_osc *osc = to_clk_sama5d4_slow_osc(hw);
-- 
2.20.1


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[PATCH 4/7] ARM: dts: at91: at91sam9x5: switch to new sckc bindings

[Alexandre Belloni]

Remove the child nodes of the sckc as they are not necessary anymore.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 arch/arm/boot/dts/at91sam9x5.dtsi | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/arch/arm/boot/dts/at91sam9x5.dtsi b/arch/arm/boot/dts/at91sam9x5.dtsi
index 07443a387a8f..ff50f49842f4 100644
--- a/arch/arm/boot/dts/at91sam9x5.dtsi
+++ b/arch/arm/boot/dts/at91sam9x5.dtsi
@@ -148,28 +148,11 @@
 				clocks = <&pmc PMC_TYPE_CORE PMC_MCK>;
 			};
 
-			sckc@fffffe50 {
+			clk32k: sckc@fffffe50 {
 				compatible = "atmel,at91sam9x5-sckc";
 				reg = <0xfffffe50 0x4>;
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					clocks = <&slow_xtal>;
-				};
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					clock-frequency = <32768>;
-					clock-accuracy = <50000000>;
-				};
-
-				clk32k: slck {
-					compatible = "atmel,at91sam9x5-clk-slow";
-					#clock-cells = <0>;
-					clocks = <&slow_rc_osc>, <&slow_osc>;
-				};
+				clocks = <&slow_xtal>;
+				#clock-cells = <0>;
 			};
 
 			tcb0: timer@f8008000 {
-- 
2.20.1


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[PATCH 5/7] ARM: dts: at91: at91sam9g45: switch to new sckc bindings

[Alexandre Belloni]

Remove the child nodes of the sckc as they are not necessary anymore.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 arch/arm/boot/dts/at91sam9g45.dtsi | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/arch/arm/boot/dts/at91sam9g45.dtsi b/arch/arm/boot/dts/at91sam9g45.dtsi
index d16db1fa7e15..74a011077d54 100644
--- a/arch/arm/boot/dts/at91sam9g45.dtsi
+++ b/arch/arm/boot/dts/at91sam9g45.dtsi
@@ -1257,30 +1257,11 @@
 				};
 			};
 
-			sckc@fffffd50 {
+			clk32k: sckc@fffffd50 {
 				compatible = "atmel,at91sam9x5-sckc";
 				reg = <0xfffffd50 0x4>;
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <1200000>;
-					clocks = <&slow_xtal>;
-				};
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <75>;
-					clock-frequency = <32768>;
-					clock-accuracy = <50000000>;
-				};
-
-				clk32k: slck {
-					compatible = "atmel,at91sam9x5-clk-slow";
-					#clock-cells = <0>;
-					clocks = <&slow_rc_osc &slow_osc>;
-				};
+				clocks = <&slow_xtal>;
+				#clock-cells = <0>;
 			};
 
 			rtc@fffffd20 {
-- 
2.20.1


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[PATCH 6/7] ARM: dts: at91: at91sam9rl: switch to new sckc bindings

[Alexandre Belloni]

Remove the child nodes of the sckc as they are not necessary anymore.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 arch/arm/boot/dts/at91sam9rl.dtsi | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/arch/arm/boot/dts/at91sam9rl.dtsi b/arch/arm/boot/dts/at91sam9rl.dtsi
index 3862ff2f26e0..f5f09a30dd3f 100644
--- a/arch/arm/boot/dts/at91sam9rl.dtsi
+++ b/arch/arm/boot/dts/at91sam9rl.dtsi
@@ -867,30 +867,11 @@
 				status = "disabled";
 			};
 
-			sckc@fffffd50 {
+			clk32k: sckc@fffffd50 {
 				compatible = "atmel,at91sam9x5-sckc";
 				reg = <0xfffffd50 0x4>;
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <1200000>;
-					clocks = <&slow_xtal>;
-				};
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					atmel,startup-time-usec = <75>;
-					clock-frequency = <32768>;
-					clock-accuracy = <50000000>;
-				};
-
-				clk32k: slck {
-					compatible = "atmel,at91sam9x5-clk-slow";
-					#clock-cells = <0>;
-					clocks = <&slow_rc_osc &slow_osc>;
-				};
+				clocks = <&slow_xtal>;
+				#clock-cells = <0>;
 			};
 
 			rtc@fffffd20 {
-- 
2.20.1


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[PATCH 7/7] ARM: dts: at91: sama5d3: switch to new sckc bindings

[Alexandre Belloni]

Remove the child nodes of the sckc as they are not necessary anymore.

Also, switch to the new atmel,sama5d3-sckc compatible string to use the
proper startup time for the RC oscillator (500 µs instead of 75).

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 arch/arm/boot/dts/at91-wb50n.dtsi |  2 +-
 arch/arm/boot/dts/sama5d3.dtsi    | 27 ++++-----------------------
 2 files changed, 5 insertions(+), 24 deletions(-)

diff --git a/arch/arm/boot/dts/at91-wb50n.dtsi b/arch/arm/boot/dts/at91-wb50n.dtsi
index 85692c8ef2b1..4ed8500a5cb8 100644
--- a/arch/arm/boot/dts/at91-wb50n.dtsi
+++ b/arch/arm/boot/dts/at91-wb50n.dtsi
@@ -42,7 +42,7 @@
 	clock-frequency = <12000000>;
 };
 
-&slow_osc {
+&clk32k {
 	atmel,osc-bypass;
 };
 
diff --git a/arch/arm/boot/dts/sama5d3.dtsi b/arch/arm/boot/dts/sama5d3.dtsi
index 1408fa4a62e4..05f6554d4177 100644
--- a/arch/arm/boot/dts/sama5d3.dtsi
+++ b/arch/arm/boot/dts/sama5d3.dtsi
@@ -1370,30 +1370,11 @@
 				status = "disabled";
 			};
 
-			sckc@fffffe50 {
-				compatible = "atmel,at91sam9x5-sckc";
+			clk32k: sckc@fffffe50 {
+				compatible = "atmel,sama5d3-sckc";
 				reg = <0xfffffe50 0x4>;
-
-				slow_rc_osc: slow_rc_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
-					#clock-cells = <0>;
-					clock-frequency = <32768>;
-					clock-accuracy = <50000000>;
-					atmel,startup-time-usec = <75>;
-				};
-
-				slow_osc: slow_osc {
-					compatible = "atmel,at91sam9x5-clk-slow-osc";
-					#clock-cells = <0>;
-					clocks = <&slow_xtal>;
-					atmel,startup-time-usec = <1200000>;
-				};
-
-				clk32k: slowck {
-					compatible = "atmel,at91sam9x5-clk-slow";
-					#clock-cells = <0>;
-					clocks = <&slow_rc_osc &slow_osc>;
-				};
+				clocks = <&slow_xtal>;
+				#clock-cells = <0>;
 			};
 
 			rtc@fffffeb0 {
-- 
2.20.1


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Re: [PATCH 1/7] dt-bindings: clock: at91: new sckc bindings

[Rob Herring]

On Tue, 19 Feb 2019 18:01:54 +0100, Alexandre Belloni wrote:
> Remove the need for child nodes in the sckc binding to be able to remove
> dtc warnings and have a more modern binding.
> 
> Also document optional properties.
> 
> Cc: Rob Herring <robh@kernel.org>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> ---
>  .../devicetree/bindings/clock/at91-clock.txt  | 30 ++++++++-----------
>  1 file changed, 12 insertions(+), 18 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

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Re: [PATCH 1/7] dt-bindings: clock: at91: new sckc bindings

[Stephen Boyd]

Quoting Alexandre Belloni (2019-02-19 09:01:54)
> Remove the need for child nodes in the sckc binding to be able to remove
> dtc warnings and have a more modern binding.
> 
> Also document optional properties.
> 
> Cc: Rob Herring <robh@kernel.org>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> ---

Applied to clk-next


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Re: [PATCH 2/7] clk: at91: modernize sckc binding

[Stephen Boyd]

Quoting Alexandre Belloni (2019-02-19 09:01:55)
> Remove the need for child nodes in the sckc binding and register the whole
> sckc tree (3 clocks in total) from the sckc node.
> 
> DT backward compatibility is kept by looking for properties in child nodes
> when they are not present in the sckc node.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> ---

Applied to clk-next


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Re: [PATCH 3/7] clk: at91: sckc: handle different RC startup time

[Stephen Boyd]

Quoting Alexandre Belloni (2019-02-19 09:01:56)
> The sama5d3 slow RC oscillator as a different startup time than all the
> previous SoCs. Handle that using its own compatible.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> ---

Applied to clk-next


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