[PATCH v3 1/3] clk: composite: add _register_composite_pdata() variants

[PATCH v3 1/3] clk: composite: add _register_composite_pdata() variants

[Michael Walle]

Add support for the new way of specifying the clock parents. Add the
two new functions
    clk_hw_register_composite_pdata()
    clk_register_composite_pdata()
to let the driver provide parent_data instead of the parent_names.

Signed-off-by: Michael Walle <michael@walle.cc>
---
New patch in v3 of this series. Thus no changelog.

 drivers/clk/clk-composite.c  | 56 ++++++++++++++++++++++++++++++++++--
 include/linux/clk-provider.h | 13 +++++++++
 2 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 3e9c3e608769..7376f573bfdb 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -199,8 +199,9 @@ static void clk_composite_disable(struct clk_hw *hw)
 	gate_ops->disable(gate_hw);
 }
 
-struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
-			const char * const *parent_names, int num_parents,
+static struct clk_hw *__clk_hw_register_composite(struct device *dev,
+			const char *name, const char * const *parent_names,
+			const struct clk_parent_data *pdata, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
@@ -218,7 +219,10 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
 
 	init.name = name;
 	init.flags = flags;
-	init.parent_names = parent_names;
+	if (parent_names)
+		init.parent_names = parent_names;
+	else
+		init.parent_data = pdata;
 	init.num_parents = num_parents;
 	hw = &composite->hw;
 
@@ -312,6 +316,34 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
 	return hw;
 }
 
+struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
+			const char * const *parent_names, int num_parents,
+			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+			unsigned long flags)
+{
+	return __clk_hw_register_composite(dev, name, parent_names, NULL,
+					   num_parents, mux_hw, mux_ops,
+					   rate_hw, rate_ops, gate_hw,
+					   gate_ops, flags);
+}
+
+struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
+			const char *name,
+			const struct clk_parent_data *parent_data,
+			int num_parents,
+			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+			unsigned long flags)
+{
+	return __clk_hw_register_composite(dev, name, NULL, parent_data,
+					   num_parents, mux_hw, mux_ops,
+					   rate_hw, rate_ops, gate_hw,
+					   gate_ops, flags);
+}
+
 struct clk *clk_register_composite(struct device *dev, const char *name,
 			const char * const *parent_names, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
@@ -329,6 +361,24 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
 	return hw->clk;
 }
 
+struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
+			const struct clk_parent_data *parent_data,
+			int num_parents,
+			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+			unsigned long flags)
+{
+	struct clk_hw *hw;
+
+	hw = clk_hw_register_composite_pdata(dev, name, parent_data,
+			num_parents, mux_hw, mux_ops, rate_hw, rate_ops,
+			gate_hw, gate_ops, flags);
+	if (IS_ERR(hw))
+		return ERR_CAST(hw);
+	return hw->clk;
+}
+
 void clk_unregister_composite(struct clk *clk)
 {
 	struct clk_composite *composite;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index caf4b9df16eb..e2e9d867df36 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -743,6 +743,12 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
 		struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 		struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 		unsigned long flags);
+struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
+		const struct clk_parent_data *parent_data, int num_parents,
+		struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+		struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+		struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+		unsigned long flags);
 void clk_unregister_composite(struct clk *clk);
 struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
 		const char * const *parent_names, int num_parents,
@@ -750,6 +756,13 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
 		struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 		struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 		unsigned long flags);
+struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
+		const char *name,
+		const struct clk_parent_data *parent_data, int num_parents,
+		struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+		struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+		struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+		unsigned long flags);
 void clk_hw_unregister_composite(struct clk_hw *hw);
 
 /**
-- 
2.20.1

[PATCH v3 2/3] dt-bindings: clock: document the fsl-sai driver

[Michael Walle]

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Rob Herring <robh@kernel.org>
---
changes since v2:
 - add Reviewed-by tag

changes since v1:
 - dual license gpl-2.0-only and bsd-2-clause
 - add "additionalProperties: false"
 - wrap example in soc {} node with correct #address-cells and #size-cells

 .../bindings/clock/fsl,sai-clock.yaml         | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml b/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml
new file mode 100644
index 000000000000..8fb2060ac47f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/clock/fsl,sai-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale SAI bitclock-as-a-clock binding
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  It is possible to use the BCLK pin of a SAI module as a generic clock
+  output. Some SoC are very constrained in their pin multiplexer
+  configuration. Eg. pins can only be changed groups. For example, on the
+  LS1028A SoC you can only enable SAIs in pairs. If you use only one SAI,
+  the second pins are wasted. Using this binding it is possible to use the
+  clock of the second SAI as a MCLK clock for an audio codec, for example.
+
+  This is a composite of a gated clock and a divider clock.
+
+properties:
+  compatible:
+    const: fsl,vf610-sai-clock
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mclk: clock-mclk@f130080 {
+            compatible = "fsl,vf610-sai-clock";
+            reg = <0x0 0xf130080 0x0 0x80>;
+            #clock-cells = <0>;
+            clocks = <&parentclk>;
+        };
+    };
-- 
2.20.1

[PATCH v3 3/3] clk: fsl-sai: new driver

[Michael Walle]

With this driver it is possible to use the BCLK pin of the SAI module as
a generic clock output. This is esp. useful if you want to drive a clock
to an audio codec. Because the output only allows integer divider values
the audio codec needs an integrated PLL.

Signed-off-by: Michael Walle <michael@walle.cc>
---
changes since v2:
 - convert to platform driver, thus also use devm_ functions
 - use new style to get the parent clock by using parent_data
   and the new clk_hw_register_composite_pdata()

changes since v1:
 - none

 drivers/clk/Kconfig       | 12 +++++
 drivers/clk/Makefile      |  1 +
 drivers/clk/clk-fsl-sai.c | 92 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 drivers/clk/clk-fsl-sai.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 45653a0e6ecd..dd1a5abc4ce8 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -174,6 +174,18 @@ config COMMON_CLK_CS2000_CP
 	help
 	  If you say yes here you get support for the CS2000 clock multiplier.
 
+config COMMON_CLK_FSL_SAI
+	bool "Clock driver for BCLK of Freescale SAI cores"
+	depends on ARCH_LAYERSCAPE || COMPILE_TEST
+	help
+	  This driver supports the Freescale SAI (Synchronous Audio Interface)
+	  to be used as a generic clock output. Some SoCs have restrictions
+	  regarding the possible pin multiplexer settings. Eg. on some SoCs
+	  two SAI interfaces can only be enabled together. If just one is
+	  needed, the BCLK pin of the second one can be used as general
+	  purpose clock output. Ideally, it can be used to drive an audio
+	  codec (sometimes known as MCLK).
+
 config COMMON_CLK_GEMINI
 	bool "Clock driver for Cortina Systems Gemini SoC"
 	depends on ARCH_GEMINI || COMPILE_TEST
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 0696a0c1ab58..ec23fd956228 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_ARCH_CLPS711X)		+= clk-clps711x.o
 obj-$(CONFIG_COMMON_CLK_CS2000_CP)	+= clk-cs2000-cp.o
 obj-$(CONFIG_ARCH_EFM32)		+= clk-efm32gg.o
 obj-$(CONFIG_COMMON_CLK_FIXED_MMIO)	+= clk-fixed-mmio.o
+obj-$(CONFIG_COMMON_CLK_FSL_SAI)	+= clk-fsl-sai.o
 obj-$(CONFIG_COMMON_CLK_GEMINI)		+= clk-gemini.o
 obj-$(CONFIG_COMMON_CLK_ASPEED)		+= clk-aspeed.o
 obj-$(CONFIG_MACH_ASPEED_G6)		+= clk-ast2600.o
diff --git a/drivers/clk/clk-fsl-sai.c b/drivers/clk/clk-fsl-sai.c
new file mode 100644
index 000000000000..0221180a4dd7
--- /dev/null
+++ b/drivers/clk/clk-fsl-sai.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Freescale SAI BCLK as a generic clock driver
+ *
+ * Copyright 2020 Michael Walle <michael@walle.cc>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#define I2S_CSR		0x00
+#define I2S_CR2		0x08
+#define CSR_BCE_BIT	28
+#define CR2_BCD		BIT(24)
+#define CR2_DIV_SHIFT	0
+#define CR2_DIV_WIDTH	8
+
+struct fsl_sai_clk {
+	struct clk_divider div;
+	struct clk_gate gate;
+	spinlock_t lock;
+};
+
+static int fsl_sai_clk_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct fsl_sai_clk *sai_clk;
+	struct clk_parent_data pdata = { .index = 0 };
+	void __iomem *base;
+	struct clk_hw *hw;
+	struct resource *res;
+
+	sai_clk = devm_kzalloc(dev, sizeof(*sai_clk), GFP_KERNEL);
+	if (!sai_clk)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	spin_lock_init(&sai_clk->lock);
+
+	sai_clk->gate.reg = base + I2S_CSR;
+	sai_clk->gate.bit_idx = CSR_BCE_BIT;
+	sai_clk->gate.lock = &sai_clk->lock;
+
+	sai_clk->div.reg = base + I2S_CR2;
+	sai_clk->div.shift = CR2_DIV_SHIFT;
+	sai_clk->div.width = CR2_DIV_WIDTH;
+	sai_clk->div.lock = &sai_clk->lock;
+
+	/* set clock direction, we are the BCLK master */
+	writel(CR2_BCD, base + I2S_CR2);
+
+	hw = clk_hw_register_composite_pdata(dev, dev->of_node->name,
+					     &pdata, 1, NULL, NULL,
+					     &sai_clk->div.hw,
+					     &clk_divider_ops,
+					     &sai_clk->gate.hw,
+					     &clk_gate_ops,
+					     CLK_SET_RATE_GATE);
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
+}
+
+static const struct of_device_id of_fsl_sai_clk_ids[] = {
+	{ .compatible = "fsl,vf610-sai-clock" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, of_fsl_sai_clk_ids);
+
+static struct platform_driver fsl_sai_clk_driver = {
+	.probe = fsl_sai_clk_probe,
+	.driver		= {
+		.name	= "fsl-sai-clk",
+		.of_match_table = of_fsl_sai_clk_ids,
+	},
+};
+module_platform_driver(fsl_sai_clk_driver);
+
+MODULE_DESCRIPTION("Freescale SAI bitclock-as-a-clock driver");
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:fsl-sai-clk");
-- 
2.20.1

Re: [PATCH v3 3/3] clk: fsl-sai: new driver

[Michael Walle]

Am 2020-01-03 00:11, schrieb Michael Walle:
> With this driver it is possible to use the BCLK pin of the SAI module 
> as
> a generic clock output. This is esp. useful if you want to drive a 
> clock
> to an audio codec. Because the output only allows integer divider 
> values
> the audio codec needs an integrated PLL.
> 
> Signed-off-by: Michael Walle <michael@walle.cc>

Ping :)

> ---
> changes since v2:
>  - convert to platform driver, thus also use devm_ functions
>  - use new style to get the parent clock by using parent_data
>    and the new clk_hw_register_composite_pdata()
> 
> changes since v1:
>  - none
> 
>  drivers/clk/Kconfig       | 12 +++++
>  drivers/clk/Makefile      |  1 +
>  drivers/clk/clk-fsl-sai.c | 92 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 105 insertions(+)
>  create mode 100644 drivers/clk/clk-fsl-sai.c
> 
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 45653a0e6ecd..dd1a5abc4ce8 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -174,6 +174,18 @@ config COMMON_CLK_CS2000_CP
>  	help
>  	  If you say yes here you get support for the CS2000 clock 
> multiplier.
> 
> +config COMMON_CLK_FSL_SAI
> +	bool "Clock driver for BCLK of Freescale SAI cores"
> +	depends on ARCH_LAYERSCAPE || COMPILE_TEST
> +	help
> +	  This driver supports the Freescale SAI (Synchronous Audio 
> Interface)
> +	  to be used as a generic clock output. Some SoCs have restrictions
> +	  regarding the possible pin multiplexer settings. Eg. on some SoCs
> +	  two SAI interfaces can only be enabled together. If just one is
> +	  needed, the BCLK pin of the second one can be used as general
> +	  purpose clock output. Ideally, it can be used to drive an audio
> +	  codec (sometimes known as MCLK).
> +
>  config COMMON_CLK_GEMINI
>  	bool "Clock driver for Cortina Systems Gemini SoC"
>  	depends on ARCH_GEMINI || COMPILE_TEST
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 0696a0c1ab58..ec23fd956228 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_ARCH_CLPS711X)		+= clk-clps711x.o
>  obj-$(CONFIG_COMMON_CLK_CS2000_CP)	+= clk-cs2000-cp.o
>  obj-$(CONFIG_ARCH_EFM32)		+= clk-efm32gg.o
>  obj-$(CONFIG_COMMON_CLK_FIXED_MMIO)	+= clk-fixed-mmio.o
> +obj-$(CONFIG_COMMON_CLK_FSL_SAI)	+= clk-fsl-sai.o
>  obj-$(CONFIG_COMMON_CLK_GEMINI)		+= clk-gemini.o
>  obj-$(CONFIG_COMMON_CLK_ASPEED)		+= clk-aspeed.o
>  obj-$(CONFIG_MACH_ASPEED_G6)		+= clk-ast2600.o
> diff --git a/drivers/clk/clk-fsl-sai.c b/drivers/clk/clk-fsl-sai.c
> new file mode 100644
> index 000000000000..0221180a4dd7
> --- /dev/null
> +++ b/drivers/clk/clk-fsl-sai.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Freescale SAI BCLK as a generic clock driver
> + *
> + * Copyright 2020 Michael Walle <michael@walle.cc>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/slab.h>
> +
> +#define I2S_CSR		0x00
> +#define I2S_CR2		0x08
> +#define CSR_BCE_BIT	28
> +#define CR2_BCD		BIT(24)
> +#define CR2_DIV_SHIFT	0
> +#define CR2_DIV_WIDTH	8
> +
> +struct fsl_sai_clk {
> +	struct clk_divider div;
> +	struct clk_gate gate;
> +	spinlock_t lock;
> +};
> +
> +static int fsl_sai_clk_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct fsl_sai_clk *sai_clk;
> +	struct clk_parent_data pdata = { .index = 0 };
> +	void __iomem *base;
> +	struct clk_hw *hw;
> +	struct resource *res;
> +
> +	sai_clk = devm_kzalloc(dev, sizeof(*sai_clk), GFP_KERNEL);
> +	if (!sai_clk)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	spin_lock_init(&sai_clk->lock);
> +
> +	sai_clk->gate.reg = base + I2S_CSR;
> +	sai_clk->gate.bit_idx = CSR_BCE_BIT;
> +	sai_clk->gate.lock = &sai_clk->lock;
> +
> +	sai_clk->div.reg = base + I2S_CR2;
> +	sai_clk->div.shift = CR2_DIV_SHIFT;
> +	sai_clk->div.width = CR2_DIV_WIDTH;
> +	sai_clk->div.lock = &sai_clk->lock;
> +
> +	/* set clock direction, we are the BCLK master */
> +	writel(CR2_BCD, base + I2S_CR2);
> +
> +	hw = clk_hw_register_composite_pdata(dev, dev->of_node->name,
> +					     &pdata, 1, NULL, NULL,
> +					     &sai_clk->div.hw,
> +					     &clk_divider_ops,
> +					     &sai_clk->gate.hw,
> +					     &clk_gate_ops,
> +					     CLK_SET_RATE_GATE);
> +	if (IS_ERR(hw))
> +		return PTR_ERR(hw);
> +
> +	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
> +}
> +
> +static const struct of_device_id of_fsl_sai_clk_ids[] = {
> +	{ .compatible = "fsl,vf610-sai-clock" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, of_fsl_sai_clk_ids);
> +
> +static struct platform_driver fsl_sai_clk_driver = {
> +	.probe = fsl_sai_clk_probe,
> +	.driver		= {
> +		.name	= "fsl-sai-clk",
> +		.of_match_table = of_fsl_sai_clk_ids,
> +	},
> +};
> +module_platform_driver(fsl_sai_clk_driver);
> +
> +MODULE_DESCRIPTION("Freescale SAI bitclock-as-a-clock driver");
> +MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:fsl-sai-clk");

Re: [PATCH v3 1/3] clk: composite: add _register_composite_pdata() variants

[Stephen Boyd]

Quoting Michael Walle (2020-01-02 15:10:59)
> Add support for the new way of specifying the clock parents. Add the
> two new functions
>     clk_hw_register_composite_pdata()
>     clk_register_composite_pdata()
> to let the driver provide parent_data instead of the parent_names.
> 
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---

Applied to clk-next

Re: [PATCH v3 2/3] dt-bindings: clock: document the fsl-sai driver

[Stephen Boyd]

Quoting Michael Walle (2020-01-02 15:11:00)
> Signed-off-by: Michael Walle <michael@walle.cc>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---

Applied to clk-next

Re: [PATCH v3 3/3] clk: fsl-sai: new driver

[Stephen Boyd]

Quoting Michael Walle (2020-01-02 15:11:01)
> With this driver it is possible to use the BCLK pin of the SAI module as
> a generic clock output. This is esp. useful if you want to drive a clock
> to an audio codec. Because the output only allows integer divider values
> the audio codec needs an integrated PLL.
> 
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---

Applied to clk-next