[PATCH 0/4] ASoC: stm32: sai: add mclk clock provider

[PATCH 0/4] ASoC: stm32: sai: add mclk clock provider

[Olivier Moysan]

This patch set allows to use STM32 SAI interface as a master clock provider.
The Cirrus cs42l51 codec patch gives the example of the source code required on codec side,
to use SAI mclk provider.

These patches allow to cover the following use cases:
	- SAI is master or slave and is master clock provider
	- SAI is master or slave and is not master clock provider (another sai provides the mclk clock)

Implementation overview:
- mclk configuration
	SAI is registered in clock framework:
		- either as a mclk provider (optional in DT). SAI generates mclk when requested by DAPM
		- or as a mclk consumer (optional in DT).
	cs42l51 codec is configured as a mclk consumer (optional in DT)

- mclk power
	A DAPM is registered in codec to handle mclk enable/disable (DAPM route is set in soundcard node)

- mclk rate:
	mclk rate is computed at runtime from stream rate and mclk-fs ratio provided in DT
	mclk rate is propagated through sysclk callback to the SAI which is mclk consumer.
	The mclk rate is set exclusively to avoid concurrent rate requests on SAI master.

Regards
Olivier

Olivier Moysan (4):
  ASoC: dt-bindings: add mclk provider support to stm32 sai
  ASoC: dt-bindings: add mclk support to cs42l51
  ASoC: stm32: sai: set sai as mclk clock provider
  ASoC: cs42l51: add mclk support

 .../devicetree/bindings/sound/cs42l51.txt          |  17 ++
 .../devicetree/bindings/sound/st,stm32-sai.txt     |   7 +
 .../devicetree/bindings/trivial-devices.txt        |   1 -
 sound/soc/codecs/cs42l51.c                         |   8 +
 sound/soc/stm/stm32_sai.h                          |   3 +
 sound/soc/stm/stm32_sai_sub.c                      | 275 ++++++++++++++++++---
 6 files changed, 274 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/cs42l51.txt

-- 
2.7.4

[PATCH 1/4] ASoC: dt-bindings: add mclk provider support to stm32 sai

[Olivier Moysan]

add mclk provider support to stm32 sai

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 Documentation/devicetree/bindings/sound/st,stm32-sai.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index 3a3fc506e43a..3f4467ff0aa2 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -31,7 +31,11 @@ SAI subnodes required properties:
   - reg: Base address and size of SAI sub-block register set.
   - clocks: Must contain one phandle and clock specifier pair
 	for sai_ck which feeds the internal clock generator.
+	If the SAI shares a master clock, with another SAI set as MCLK
+	clock provider, SAI provider phandle must be specified here.
   - clock-names: Must contain "sai_ck".
+	Must also contain "MCLK", if SAI shares a master clock,
+	with a SAI set as MCLK clock provider.
   - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
   - dma-names: identifier string for each DMA request line
 	"tx": if sai sub-block is configured as playback DAI
@@ -51,6 +55,9 @@ SAI subnodes Optional properties:
 	configured according to protocol defined in related DAI link node,
 	such as i2s, left justified, right justified, dsp and pdm protocols.
 	Note: ac97 protocol is not supported by SAI driver
+   - #clock-cells: should be 0. This property must be present if the SAI device
+	is a master clock provider, according to clocks bindings, described in
+	Documentation/devicetree/bindings/clock/clock-bindings.txt.
 
 The device node should contain one 'port' child node with one child 'endpoint'
 node, according to the bindings defined in Documentation/devicetree/bindings/
-- 
2.7.4

Applied "ASoC: dt-bindings: add mclk provider support to stm32 sai" to the asoc tree

[Mark Brown]

The patch

   ASoC: dt-bindings: add mclk provider support to stm32 sai

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From af16112457d8175b444baa9aac02558a1e1154b5 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:33 +0200
Subject: [PATCH] ASoC: dt-bindings: add mclk provider support to stm32 sai

add mclk provider support to stm32 sai

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/devicetree/bindings/sound/st,stm32-sai.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index 3a3fc506e43a..3f4467ff0aa2 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -31,7 +31,11 @@ SAI subnodes required properties:
   - reg: Base address and size of SAI sub-block register set.
   - clocks: Must contain one phandle and clock specifier pair
 	for sai_ck which feeds the internal clock generator.
+	If the SAI shares a master clock, with another SAI set as MCLK
+	clock provider, SAI provider phandle must be specified here.
   - clock-names: Must contain "sai_ck".
+	Must also contain "MCLK", if SAI shares a master clock,
+	with a SAI set as MCLK clock provider.
   - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
   - dma-names: identifier string for each DMA request line
 	"tx": if sai sub-block is configured as playback DAI
@@ -51,6 +55,9 @@ SAI subnodes Optional properties:
 	configured according to protocol defined in related DAI link node,
 	such as i2s, left justified, right justified, dsp and pdm protocols.
 	Note: ac97 protocol is not supported by SAI driver
+   - #clock-cells: should be 0. This property must be present if the SAI device
+	is a master clock provider, according to clocks bindings, described in
+	Documentation/devicetree/bindings/clock/clock-bindings.txt.
 
 The device node should contain one 'port' child node with one child 'endpoint'
 node, according to the bindings defined in Documentation/devicetree/bindings/
-- 
2.19.0.rc2

Applied "ASoC: dt-bindings: add mclk provider support to stm32 sai" to the asoc tree

[Mark Brown]

The patch

   ASoC: dt-bindings: add mclk provider support to stm32 sai

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From af16112457d8175b444baa9aac02558a1e1154b5 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:33 +0200
Subject: [PATCH] ASoC: dt-bindings: add mclk provider support to stm32 sai

add mclk provider support to stm32 sai

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/devicetree/bindings/sound/st,stm32-sai.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index 3a3fc506e43a..3f4467ff0aa2 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -31,7 +31,11 @@ SAI subnodes required properties:
   - reg: Base address and size of SAI sub-block register set.
   - clocks: Must contain one phandle and clock specifier pair
 	for sai_ck which feeds the internal clock generator.
+	If the SAI shares a master clock, with another SAI set as MCLK
+	clock provider, SAI provider phandle must be specified here.
   - clock-names: Must contain "sai_ck".
+	Must also contain "MCLK", if SAI shares a master clock,
+	with a SAI set as MCLK clock provider.
   - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
   - dma-names: identifier string for each DMA request line
 	"tx": if sai sub-block is configured as playback DAI
@@ -51,6 +55,9 @@ SAI subnodes Optional properties:
 	configured according to protocol defined in related DAI link node,
 	such as i2s, left justified, right justified, dsp and pdm protocols.
 	Note: ac97 protocol is not supported by SAI driver
+   - #clock-cells: should be 0. This property must be present if the SAI device
+	is a master clock provider, according to clocks bindings, described in
+	Documentation/devicetree/bindings/clock/clock-bindings.txt.
 
 The device node should contain one 'port' child node with one child 'endpoint'
 node, according to the bindings defined in Documentation/devicetree/bindings/
-- 
2.19.0.rc2

[PATCH 2/4] ASoC: dt-bindings: add mclk support to cs42l51

[Olivier Moysan]

Add clocks properties to cs42l51 Cirrus codec,
to support master clock provider.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 Documentation/devicetree/bindings/sound/cs42l51.txt   | 17 +++++++++++++++++
 Documentation/devicetree/bindings/trivial-devices.txt |  1 -
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/sound/cs42l51.txt

diff --git a/Documentation/devicetree/bindings/sound/cs42l51.txt b/Documentation/devicetree/bindings/sound/cs42l51.txt
new file mode 100644
index 000000000000..4b5de33ce377
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cs42l51.txt
@@ -0,0 +1,17 @@
+CS42L51 audio CODEC
+
+Optional properties:
+
+  - clocks : a list of phandles + clock-specifiers, one for each entry in
+    clock-names
+
+  - clock-names : must contain "MCLK"
+
+Example:
+
+cs42l51: cs42l51@4a {
+	compatible = "cirrus,cs42l51";
+	reg = <0x4a>;
+	clocks = <&mclk_prov>;
+	clock-names = "MCLK";
+};
diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt
index 763a2808a95c..69c934aec13b 100644
--- a/Documentation/devicetree/bindings/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/trivial-devices.txt
@@ -35,7 +35,6 @@ at,24c08		i2c serial eeprom  (24cxx)
 atmel,at97sc3204t	i2c trusted platform module (TPM)
 capella,cm32181		CM32181: Ambient Light Sensor
 capella,cm3232		CM3232: Ambient Light Sensor
-cirrus,cs42l51		Cirrus Logic CS42L51 audio codec
 dallas,ds1374		I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
 dallas,ds1631		High-Precision Digital Thermometer
 dallas,ds1672		Dallas DS1672 Real-time Clock
-- 
2.7.4

Applied "ASoC: dt-bindings: add mclk support to cs42l51" to the asoc tree

[Mark Brown]

The patch

   ASoC: dt-bindings: add mclk support to cs42l51

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 1c5083b37deaa99e07cc3082e190a509efd2a225 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:34 +0200
Subject: [PATCH] ASoC: dt-bindings: add mclk support to cs42l51

Add clocks properties to cs42l51 Cirrus codec,
to support master clock provider.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 .../devicetree/bindings/sound/cs42l51.txt       | 17 +++++++++++++++++
 .../devicetree/bindings/trivial-devices.txt     |  1 -
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/sound/cs42l51.txt

diff --git a/Documentation/devicetree/bindings/sound/cs42l51.txt b/Documentation/devicetree/bindings/sound/cs42l51.txt
new file mode 100644
index 000000000000..4b5de33ce377
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cs42l51.txt
@@ -0,0 +1,17 @@
+CS42L51 audio CODEC
+
+Optional properties:
+
+  - clocks : a list of phandles + clock-specifiers, one for each entry in
+    clock-names
+
+  - clock-names : must contain "MCLK"
+
+Example:
+
+cs42l51: cs42l51@4a {
+	compatible = "cirrus,cs42l51";
+	reg = <0x4a>;
+	clocks = <&mclk_prov>;
+	clock-names = "MCLK";
+};
diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt
index 763a2808a95c..69c934aec13b 100644
--- a/Documentation/devicetree/bindings/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/trivial-devices.txt
@@ -35,7 +35,6 @@ at,24c08		i2c serial eeprom  (24cxx)
 atmel,at97sc3204t	i2c trusted platform module (TPM)
 capella,cm32181		CM32181: Ambient Light Sensor
 capella,cm3232		CM3232: Ambient Light Sensor
-cirrus,cs42l51		Cirrus Logic CS42L51 audio codec
 dallas,ds1374		I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
 dallas,ds1631		High-Precision Digital Thermometer
 dallas,ds1672		Dallas DS1672 Real-time Clock
-- 
2.19.0.rc2

Applied "ASoC: dt-bindings: add mclk support to cs42l51" to the asoc tree

[Mark Brown]

The patch

   ASoC: dt-bindings: add mclk support to cs42l51

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 1c5083b37deaa99e07cc3082e190a509efd2a225 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:34 +0200
Subject: [PATCH] ASoC: dt-bindings: add mclk support to cs42l51

Add clocks properties to cs42l51 Cirrus codec,
to support master clock provider.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 .../devicetree/bindings/sound/cs42l51.txt       | 17 +++++++++++++++++
 .../devicetree/bindings/trivial-devices.txt     |  1 -
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/sound/cs42l51.txt

diff --git a/Documentation/devicetree/bindings/sound/cs42l51.txt b/Documentation/devicetree/bindings/sound/cs42l51.txt
new file mode 100644
index 000000000000..4b5de33ce377
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cs42l51.txt
@@ -0,0 +1,17 @@
+CS42L51 audio CODEC
+
+Optional properties:
+
+  - clocks : a list of phandles + clock-specifiers, one for each entry in
+    clock-names
+
+  - clock-names : must contain "MCLK"
+
+Example:
+
+cs42l51: cs42l51@4a {
+	compatible = "cirrus,cs42l51";
+	reg = <0x4a>;
+	clocks = <&mclk_prov>;
+	clock-names = "MCLK";
+};
diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt
index 763a2808a95c..69c934aec13b 100644
--- a/Documentation/devicetree/bindings/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/trivial-devices.txt
@@ -35,7 +35,6 @@ at,24c08		i2c serial eeprom  (24cxx)
 atmel,at97sc3204t	i2c trusted platform module (TPM)
 capella,cm32181		CM32181: Ambient Light Sensor
 capella,cm3232		CM3232: Ambient Light Sensor
-cirrus,cs42l51		Cirrus Logic CS42L51 audio codec
 dallas,ds1374		I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
 dallas,ds1631		High-Precision Digital Thermometer
 dallas,ds1672		Dallas DS1672 Real-time Clock
-- 
2.19.0.rc2

[PATCH 3/4] ASoC: stm32: sai: set sai as mclk clock provider

[Olivier Moysan]

Add master clock generation support in STM32 SAI.
The master clock provided by SAI can be used to feed a codec.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 sound/soc/stm/stm32_sai.h     |   3 +
 sound/soc/stm/stm32_sai_sub.c | 275 ++++++++++++++++++++++++++++++++++++------
 2 files changed, 242 insertions(+), 36 deletions(-)

diff --git a/sound/soc/stm/stm32_sai.h b/sound/soc/stm/stm32_sai.h
index f25422174909..08de899c766b 100644
--- a/sound/soc/stm/stm32_sai.h
+++ b/sound/soc/stm/stm32_sai.h
@@ -91,6 +91,9 @@
 #define SAI_XCR1_OSR_SHIFT	26
 #define SAI_XCR1_OSR		BIT(SAI_XCR1_OSR_SHIFT)
 
+#define SAI_XCR1_MCKEN_SHIFT	27
+#define SAI_XCR1_MCKEN		BIT(SAI_XCR1_MCKEN_SHIFT)
+
 /******************* Bit definition for SAI_XCR2 register *******************/
 #define SAI_XCR2_FTH_SHIFT	0
 #define SAI_XCR2_FTH_MASK	GENMASK(2, SAI_XCR2_FTH_SHIFT)
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 56a227e0bd71..31d22abd3204 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_irq.h>
@@ -68,6 +69,8 @@
 #define SAI_IEC60958_BLOCK_FRAMES	192
 #define SAI_IEC60958_STATUS_BYTES	24
 
+#define SAI_MCLK_NAME_LEN		32
+
 /**
  * struct stm32_sai_sub_data - private data of SAI sub block (block A or B)
  * @pdev: device data pointer
@@ -80,6 +83,7 @@
  * @pdata: SAI block parent data pointer
  * @np_sync_provider: synchronization provider node
  * @sai_ck: kernel clock feeding the SAI clock generator
+ * @sai_mclk: master clock from SAI mclk provider
  * @phys_addr: SAI registers physical base address
  * @mclk_rate: SAI block master clock frequency (Hz). set at init
  * @id: SAI sub block id corresponding to sub-block A or B
@@ -110,6 +114,7 @@ struct stm32_sai_sub_data {
 	struct stm32_sai_data *pdata;
 	struct device_node *np_sync_provider;
 	struct clk *sai_ck;
+	struct clk *sai_mclk;
 	dma_addr_t phys_addr;
 	unsigned int mclk_rate;
 	unsigned int id;
@@ -251,6 +256,177 @@ static const struct snd_kcontrol_new iec958_ctls = {
 	.put = snd_pcm_iec958_put,
 };
 
+struct stm32_sai_mclk_data {
+	struct clk_hw hw;
+	unsigned long freq;
+	struct stm32_sai_sub_data *sai_data;
+};
+
+#define to_mclk_data(_hw) container_of(_hw, struct stm32_sai_mclk_data, hw)
+#define STM32_SAI_MAX_CLKS 1
+
+static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned long input_rate,
+				 unsigned long output_rate)
+{
+	int version = sai->pdata->conf->version;
+	int div;
+
+	div = DIV_ROUND_CLOSEST(input_rate, output_rate);
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+	dev_dbg(&sai->pdev->dev, "SAI divider %d\n", div);
+
+	if (input_rate % div)
+		dev_dbg(&sai->pdev->dev,
+			"Rate not accurate. requested (%ld), actual (%ld)\n",
+			output_rate, input_rate / div);
+
+	return div;
+}
+
+static int stm32_sai_set_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned int div)
+{
+	int version = sai->pdata->conf->version;
+	int ret, cr1, mask;
+
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+
+	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
+	cr1 = SAI_XCR1_MCKDIV_SET(div);
+	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
+	if (ret < 0)
+		dev_err(&sai->pdev->dev, "Failed to update CR1 register\n");
+
+	return ret;
+}
+
+static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long *prate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	int div;
+
+	div = stm32_sai_get_clk_div(sai, *prate, rate);
+	if (div < 0)
+		return div;
+
+	mclk->freq = *prate / div;
+
+	return mclk->freq;
+}
+
+static unsigned long stm32_sai_mclk_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+
+	return mclk->freq;
+}
+
+static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	unsigned int div;
+	int ret;
+
+	div = stm32_sai_get_clk_div(sai, parent_rate, rate);
+	if (div < 0)
+		return div;
+
+	ret = stm32_sai_set_clk_div(sai, div);
+	if (ret)
+		return ret;
+
+	mclk->freq = rate;
+
+	return 0;
+}
+
+static int stm32_sai_mclk_enable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Enable master clock\n");
+
+	return regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
+				  SAI_XCR1_MCKEN, SAI_XCR1_MCKEN);
+}
+
+static void stm32_sai_mclk_disable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Disable master clock\n");
+
+	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_MCKEN, 0);
+}
+
+static const struct clk_ops mclk_ops = {
+	.enable = stm32_sai_mclk_enable,
+	.disable = stm32_sai_mclk_disable,
+	.recalc_rate = stm32_sai_mclk_recalc_rate,
+	.round_rate = stm32_sai_mclk_round_rate,
+	.set_rate = stm32_sai_mclk_set_rate,
+};
+
+static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai)
+{
+	struct clk_hw *hw;
+	struct stm32_sai_mclk_data *mclk;
+	struct device *dev = &sai->pdev->dev;
+	const char *pname = __clk_get_name(sai->sai_ck);
+	char *mclk_name, *p, *s = (char *)pname;
+	int ret, i = 0;
+
+	mclk = devm_kzalloc(dev, sizeof(mclk), GFP_KERNEL);
+	if (!mclk)
+		return -ENOMEM;
+
+	mclk_name = devm_kcalloc(dev, sizeof(char),
+				 SAI_MCLK_NAME_LEN, GFP_KERNEL);
+	if (!mclk_name)
+		return -ENOMEM;
+
+	/*
+	 * Forge mclk clock name from parent clock name and suffix.
+	 * String after "_" char is stripped in parent name.
+	 */
+	p = mclk_name;
+	while (*s && *s != '_' && (i < (SAI_MCLK_NAME_LEN - 6))) {
+		*p++ = *s++;
+		i++;
+	}
+	STM_SAI_IS_SUB_A(sai) ?
+		strncat(p, "a_mclk", 6) : strncat(p, "b_mclk", 6);
+
+	mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0);
+	mclk->sai_data = sai;
+	hw = &mclk->hw;
+
+	dev_dbg(dev, "Register master clock %s\n", mclk_name);
+	ret = devm_clk_hw_register(&sai->pdev->dev, hw);
+	if (ret) {
+		dev_err(dev, "mclk register returned %d\n", ret);
+		return ret;
+	}
+	sai->sai_mclk = hw->clk;
+
+	/* register mclk provider */
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
+}
+
 static irqreturn_t stm32_sai_isr(int irq, void *devid)
 {
 	struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
@@ -312,15 +488,25 @@ static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int ret;
 
-	if ((dir == SND_SOC_CLOCK_OUT) && sai->master) {
+	if (dir == SND_SOC_CLOCK_OUT) {
 		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
 					 SAI_XCR1_NODIV,
 					 (unsigned int)~SAI_XCR1_NODIV);
 		if (ret < 0)
 			return ret;
 
-		sai->mclk_rate = freq;
 		dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
+		sai->mclk_rate = freq;
+
+		if (sai->sai_mclk) {
+			ret = clk_set_rate_exclusive(sai->sai_mclk,
+						     sai->mclk_rate);
+			if (ret) {
+				dev_err(cpu_dai->dev,
+					"Could not set mclk rate\n");
+				return ret;
+			}
+		}
 	}
 
 	return 0;
@@ -715,15 +901,9 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 {
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int cr1, mask, div = 0;
-	int sai_clk_rate, mclk_ratio, den, ret;
-	int version = sai->pdata->conf->version;
+	int sai_clk_rate, mclk_ratio, den;
 	unsigned int rate = params_rate(params);
 
-	if (!sai->mclk_rate) {
-		dev_err(cpu_dai->dev, "Mclk rate is null\n");
-		return -EINVAL;
-	}
-
 	if (!(rate % 11025))
 		clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k);
 	else
@@ -731,14 +911,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 	sai_clk_rate = clk_get_rate(sai->sai_ck);
 
 	if (STM_SAI_IS_F4(sai->pdata)) {
-		/*
-		 * mclk_rate = 256 * fs
-		 * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
-		 * MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		/* mclk on (NODIV=0)
+		 *   mclk_rate = 256 * fs
+		 *   MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
+		 *   MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		 * mclk off (NODIV=1)
+		 *   MCKDIV ignored. sck = sai_ck
 		 */
-		if (2 * sai_clk_rate >= 3 * sai->mclk_rate)
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						2 * sai->mclk_rate);
+		if (!sai->mclk_rate)
+			return 0;
+
+		if (2 * sai_clk_rate >= 3 * sai->mclk_rate) {
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    2 * sai->mclk_rate);
+			if (div < 0)
+				return div;
+		}
 	} else {
 		/*
 		 * TDM mode :
@@ -750,8 +938,10 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 		 * Note: NOMCK/NODIV correspond to same bit.
 		 */
 		if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						(params_rate(params) * 128));
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    rate * 128);
+			if (div < 0)
+				return div;
 		} else {
 			if (sai->mclk_rate) {
 				mclk_ratio = sai->mclk_rate / rate;
@@ -764,31 +954,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 						mclk_ratio);
 					return -EINVAL;
 				}
-				div = DIV_ROUND_CLOSEST(sai_clk_rate,
-							sai->mclk_rate);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    sai->mclk_rate);
+				if (div < 0)
+					return div;
 			} else {
 				/* mclk-fs not set, master clock not active */
 				den = sai->fs_length * params_rate(params);
-				div = DIV_ROUND_CLOSEST(sai_clk_rate, den);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    den);
+				if (div < 0)
+					return div;
 			}
 		}
 	}
 
-	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
-		dev_err(cpu_dai->dev, "Divider %d out of range\n", div);
-		return -EINVAL;
-	}
-	dev_dbg(cpu_dai->dev, "SAI clock %d, divider %d\n", sai_clk_rate, div);
-
-	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
-	cr1 = SAI_XCR1_MCKDIV_SET(div);
-	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
-	if (ret < 0) {
-		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
-		return ret;
-	}
-
-	return 0;
+	return stm32_sai_set_clk_div(sai, div);
 }
 
 static int stm32_sai_hw_params(struct snd_pcm_substream *substream,
@@ -881,6 +1062,9 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
 			   SAI_XCR1_NODIV);
 
 	clk_disable_unprepare(sai->sai_ck);
+
+	clk_rate_exclusive_put(sai->sai_mclk);
+
 	sai->substream = NULL;
 }
 
@@ -903,6 +1087,8 @@ static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
 	int cr1 = 0, cr1_mask;
 
+	sai->cpu_dai = cpu_dai;
+
 	sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX);
 	/*
 	 * DMA supports 4, 8 or 16 burst sizes. Burst size 4 is the best choice,
@@ -1181,6 +1367,23 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
 		return PTR_ERR(sai->sai_ck);
 	}
 
+	if (STM_SAI_IS_F4(sai->pdata))
+		return 0;
+
+	/* Register mclk provider if requested */
+	if (of_find_property(np, "#clock-cells", NULL)) {
+		ret = stm32_sai_add_mclk_provider(sai);
+		if (ret < 0)
+			return ret;
+	} else {
+		sai->sai_mclk = devm_clk_get(&pdev->dev, "MCLK");
+		if (IS_ERR(sai->sai_mclk)) {
+			if (PTR_ERR(sai->sai_mclk) != -ENOENT)
+				return PTR_ERR(sai->sai_mclk);
+			sai->sai_mclk = NULL;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.7.4

Applied "ASoC: stm32: sai: set sai as mclk clock provider" to the asoc tree

[Mark Brown]

The patch

   ASoC: stm32: sai: set sai as mclk clock provider

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 8307b2afd386ccce369821daa2196068c47fe8cd Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:35 +0200
Subject: [PATCH] ASoC: stm32: sai: set sai as mclk clock provider

Add master clock generation support in STM32 SAI.
The master clock provided by SAI can be used to feed a codec.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/stm/stm32_sai.h     |   3 +
 sound/soc/stm/stm32_sai_sub.c | 275 +++++++++++++++++++++++++++++-----
 2 files changed, 242 insertions(+), 36 deletions(-)

diff --git a/sound/soc/stm/stm32_sai.h b/sound/soc/stm/stm32_sai.h
index f25422174909..08de899c766b 100644
--- a/sound/soc/stm/stm32_sai.h
+++ b/sound/soc/stm/stm32_sai.h
@@ -91,6 +91,9 @@
 #define SAI_XCR1_OSR_SHIFT	26
 #define SAI_XCR1_OSR		BIT(SAI_XCR1_OSR_SHIFT)
 
+#define SAI_XCR1_MCKEN_SHIFT	27
+#define SAI_XCR1_MCKEN		BIT(SAI_XCR1_MCKEN_SHIFT)
+
 /******************* Bit definition for SAI_XCR2 register *******************/
 #define SAI_XCR2_FTH_SHIFT	0
 #define SAI_XCR2_FTH_MASK	GENMASK(2, SAI_XCR2_FTH_SHIFT)
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 56a227e0bd71..31d22abd3204 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_irq.h>
@@ -68,6 +69,8 @@
 #define SAI_IEC60958_BLOCK_FRAMES	192
 #define SAI_IEC60958_STATUS_BYTES	24
 
+#define SAI_MCLK_NAME_LEN		32
+
 /**
  * struct stm32_sai_sub_data - private data of SAI sub block (block A or B)
  * @pdev: device data pointer
@@ -80,6 +83,7 @@
  * @pdata: SAI block parent data pointer
  * @np_sync_provider: synchronization provider node
  * @sai_ck: kernel clock feeding the SAI clock generator
+ * @sai_mclk: master clock from SAI mclk provider
  * @phys_addr: SAI registers physical base address
  * @mclk_rate: SAI block master clock frequency (Hz). set at init
  * @id: SAI sub block id corresponding to sub-block A or B
@@ -110,6 +114,7 @@ struct stm32_sai_sub_data {
 	struct stm32_sai_data *pdata;
 	struct device_node *np_sync_provider;
 	struct clk *sai_ck;
+	struct clk *sai_mclk;
 	dma_addr_t phys_addr;
 	unsigned int mclk_rate;
 	unsigned int id;
@@ -251,6 +256,177 @@ static const struct snd_kcontrol_new iec958_ctls = {
 	.put = snd_pcm_iec958_put,
 };
 
+struct stm32_sai_mclk_data {
+	struct clk_hw hw;
+	unsigned long freq;
+	struct stm32_sai_sub_data *sai_data;
+};
+
+#define to_mclk_data(_hw) container_of(_hw, struct stm32_sai_mclk_data, hw)
+#define STM32_SAI_MAX_CLKS 1
+
+static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned long input_rate,
+				 unsigned long output_rate)
+{
+	int version = sai->pdata->conf->version;
+	int div;
+
+	div = DIV_ROUND_CLOSEST(input_rate, output_rate);
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+	dev_dbg(&sai->pdev->dev, "SAI divider %d\n", div);
+
+	if (input_rate % div)
+		dev_dbg(&sai->pdev->dev,
+			"Rate not accurate. requested (%ld), actual (%ld)\n",
+			output_rate, input_rate / div);
+
+	return div;
+}
+
+static int stm32_sai_set_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned int div)
+{
+	int version = sai->pdata->conf->version;
+	int ret, cr1, mask;
+
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+
+	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
+	cr1 = SAI_XCR1_MCKDIV_SET(div);
+	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
+	if (ret < 0)
+		dev_err(&sai->pdev->dev, "Failed to update CR1 register\n");
+
+	return ret;
+}
+
+static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long *prate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	int div;
+
+	div = stm32_sai_get_clk_div(sai, *prate, rate);
+	if (div < 0)
+		return div;
+
+	mclk->freq = *prate / div;
+
+	return mclk->freq;
+}
+
+static unsigned long stm32_sai_mclk_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+
+	return mclk->freq;
+}
+
+static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	unsigned int div;
+	int ret;
+
+	div = stm32_sai_get_clk_div(sai, parent_rate, rate);
+	if (div < 0)
+		return div;
+
+	ret = stm32_sai_set_clk_div(sai, div);
+	if (ret)
+		return ret;
+
+	mclk->freq = rate;
+
+	return 0;
+}
+
+static int stm32_sai_mclk_enable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Enable master clock\n");
+
+	return regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
+				  SAI_XCR1_MCKEN, SAI_XCR1_MCKEN);
+}
+
+static void stm32_sai_mclk_disable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Disable master clock\n");
+
+	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_MCKEN, 0);
+}
+
+static const struct clk_ops mclk_ops = {
+	.enable = stm32_sai_mclk_enable,
+	.disable = stm32_sai_mclk_disable,
+	.recalc_rate = stm32_sai_mclk_recalc_rate,
+	.round_rate = stm32_sai_mclk_round_rate,
+	.set_rate = stm32_sai_mclk_set_rate,
+};
+
+static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai)
+{
+	struct clk_hw *hw;
+	struct stm32_sai_mclk_data *mclk;
+	struct device *dev = &sai->pdev->dev;
+	const char *pname = __clk_get_name(sai->sai_ck);
+	char *mclk_name, *p, *s = (char *)pname;
+	int ret, i = 0;
+
+	mclk = devm_kzalloc(dev, sizeof(mclk), GFP_KERNEL);
+	if (!mclk)
+		return -ENOMEM;
+
+	mclk_name = devm_kcalloc(dev, sizeof(char),
+				 SAI_MCLK_NAME_LEN, GFP_KERNEL);
+	if (!mclk_name)
+		return -ENOMEM;
+
+	/*
+	 * Forge mclk clock name from parent clock name and suffix.
+	 * String after "_" char is stripped in parent name.
+	 */
+	p = mclk_name;
+	while (*s && *s != '_' && (i < (SAI_MCLK_NAME_LEN - 6))) {
+		*p++ = *s++;
+		i++;
+	}
+	STM_SAI_IS_SUB_A(sai) ?
+		strncat(p, "a_mclk", 6) : strncat(p, "b_mclk", 6);
+
+	mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0);
+	mclk->sai_data = sai;
+	hw = &mclk->hw;
+
+	dev_dbg(dev, "Register master clock %s\n", mclk_name);
+	ret = devm_clk_hw_register(&sai->pdev->dev, hw);
+	if (ret) {
+		dev_err(dev, "mclk register returned %d\n", ret);
+		return ret;
+	}
+	sai->sai_mclk = hw->clk;
+
+	/* register mclk provider */
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
+}
+
 static irqreturn_t stm32_sai_isr(int irq, void *devid)
 {
 	struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
@@ -312,15 +488,25 @@ static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int ret;
 
-	if ((dir == SND_SOC_CLOCK_OUT) && sai->master) {
+	if (dir == SND_SOC_CLOCK_OUT) {
 		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
 					 SAI_XCR1_NODIV,
 					 (unsigned int)~SAI_XCR1_NODIV);
 		if (ret < 0)
 			return ret;
 
-		sai->mclk_rate = freq;
 		dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
+		sai->mclk_rate = freq;
+
+		if (sai->sai_mclk) {
+			ret = clk_set_rate_exclusive(sai->sai_mclk,
+						     sai->mclk_rate);
+			if (ret) {
+				dev_err(cpu_dai->dev,
+					"Could not set mclk rate\n");
+				return ret;
+			}
+		}
 	}
 
 	return 0;
@@ -715,15 +901,9 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 {
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int cr1, mask, div = 0;
-	int sai_clk_rate, mclk_ratio, den, ret;
-	int version = sai->pdata->conf->version;
+	int sai_clk_rate, mclk_ratio, den;
 	unsigned int rate = params_rate(params);
 
-	if (!sai->mclk_rate) {
-		dev_err(cpu_dai->dev, "Mclk rate is null\n");
-		return -EINVAL;
-	}
-
 	if (!(rate % 11025))
 		clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k);
 	else
@@ -731,14 +911,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 	sai_clk_rate = clk_get_rate(sai->sai_ck);
 
 	if (STM_SAI_IS_F4(sai->pdata)) {
-		/*
-		 * mclk_rate = 256 * fs
-		 * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
-		 * MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		/* mclk on (NODIV=0)
+		 *   mclk_rate = 256 * fs
+		 *   MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
+		 *   MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		 * mclk off (NODIV=1)
+		 *   MCKDIV ignored. sck = sai_ck
 		 */
-		if (2 * sai_clk_rate >= 3 * sai->mclk_rate)
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						2 * sai->mclk_rate);
+		if (!sai->mclk_rate)
+			return 0;
+
+		if (2 * sai_clk_rate >= 3 * sai->mclk_rate) {
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    2 * sai->mclk_rate);
+			if (div < 0)
+				return div;
+		}
 	} else {
 		/*
 		 * TDM mode :
@@ -750,8 +938,10 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 		 * Note: NOMCK/NODIV correspond to same bit.
 		 */
 		if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						(params_rate(params) * 128));
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    rate * 128);
+			if (div < 0)
+				return div;
 		} else {
 			if (sai->mclk_rate) {
 				mclk_ratio = sai->mclk_rate / rate;
@@ -764,31 +954,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 						mclk_ratio);
 					return -EINVAL;
 				}
-				div = DIV_ROUND_CLOSEST(sai_clk_rate,
-							sai->mclk_rate);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    sai->mclk_rate);
+				if (div < 0)
+					return div;
 			} else {
 				/* mclk-fs not set, master clock not active */
 				den = sai->fs_length * params_rate(params);
-				div = DIV_ROUND_CLOSEST(sai_clk_rate, den);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    den);
+				if (div < 0)
+					return div;
 			}
 		}
 	}
 
-	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
-		dev_err(cpu_dai->dev, "Divider %d out of range\n", div);
-		return -EINVAL;
-	}
-	dev_dbg(cpu_dai->dev, "SAI clock %d, divider %d\n", sai_clk_rate, div);
-
-	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
-	cr1 = SAI_XCR1_MCKDIV_SET(div);
-	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
-	if (ret < 0) {
-		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
-		return ret;
-	}
-
-	return 0;
+	return stm32_sai_set_clk_div(sai, div);
 }
 
 static int stm32_sai_hw_params(struct snd_pcm_substream *substream,
@@ -881,6 +1062,9 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
 			   SAI_XCR1_NODIV);
 
 	clk_disable_unprepare(sai->sai_ck);
+
+	clk_rate_exclusive_put(sai->sai_mclk);
+
 	sai->substream = NULL;
 }
 
@@ -903,6 +1087,8 @@ static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
 	int cr1 = 0, cr1_mask;
 
+	sai->cpu_dai = cpu_dai;
+
 	sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX);
 	/*
 	 * DMA supports 4, 8 or 16 burst sizes. Burst size 4 is the best choice,
@@ -1181,6 +1367,23 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
 		return PTR_ERR(sai->sai_ck);
 	}
 
+	if (STM_SAI_IS_F4(sai->pdata))
+		return 0;
+
+	/* Register mclk provider if requested */
+	if (of_find_property(np, "#clock-cells", NULL)) {
+		ret = stm32_sai_add_mclk_provider(sai);
+		if (ret < 0)
+			return ret;
+	} else {
+		sai->sai_mclk = devm_clk_get(&pdev->dev, "MCLK");
+		if (IS_ERR(sai->sai_mclk)) {
+			if (PTR_ERR(sai->sai_mclk) != -ENOENT)
+				return PTR_ERR(sai->sai_mclk);
+			sai->sai_mclk = NULL;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.19.0.rc2

Applied "ASoC: stm32: sai: set sai as mclk clock provider" to the asoc tree

[Mark Brown]

The patch

   ASoC: stm32: sai: set sai as mclk clock provider

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 8307b2afd386ccce369821daa2196068c47fe8cd Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:35 +0200
Subject: [PATCH] ASoC: stm32: sai: set sai as mclk clock provider

Add master clock generation support in STM32 SAI.
The master clock provided by SAI can be used to feed a codec.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/stm/stm32_sai.h     |   3 +
 sound/soc/stm/stm32_sai_sub.c | 275 +++++++++++++++++++++++++++++-----
 2 files changed, 242 insertions(+), 36 deletions(-)

diff --git a/sound/soc/stm/stm32_sai.h b/sound/soc/stm/stm32_sai.h
index f25422174909..08de899c766b 100644
--- a/sound/soc/stm/stm32_sai.h
+++ b/sound/soc/stm/stm32_sai.h
@@ -91,6 +91,9 @@
 #define SAI_XCR1_OSR_SHIFT	26
 #define SAI_XCR1_OSR		BIT(SAI_XCR1_OSR_SHIFT)
 
+#define SAI_XCR1_MCKEN_SHIFT	27
+#define SAI_XCR1_MCKEN		BIT(SAI_XCR1_MCKEN_SHIFT)
+
 /******************* Bit definition for SAI_XCR2 register *******************/
 #define SAI_XCR2_FTH_SHIFT	0
 #define SAI_XCR2_FTH_MASK	GENMASK(2, SAI_XCR2_FTH_SHIFT)
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 56a227e0bd71..31d22abd3204 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_irq.h>
@@ -68,6 +69,8 @@
 #define SAI_IEC60958_BLOCK_FRAMES	192
 #define SAI_IEC60958_STATUS_BYTES	24
 
+#define SAI_MCLK_NAME_LEN		32
+
 /**
  * struct stm32_sai_sub_data - private data of SAI sub block (block A or B)
  * @pdev: device data pointer
@@ -80,6 +83,7 @@
  * @pdata: SAI block parent data pointer
  * @np_sync_provider: synchronization provider node
  * @sai_ck: kernel clock feeding the SAI clock generator
+ * @sai_mclk: master clock from SAI mclk provider
  * @phys_addr: SAI registers physical base address
  * @mclk_rate: SAI block master clock frequency (Hz). set at init
  * @id: SAI sub block id corresponding to sub-block A or B
@@ -110,6 +114,7 @@ struct stm32_sai_sub_data {
 	struct stm32_sai_data *pdata;
 	struct device_node *np_sync_provider;
 	struct clk *sai_ck;
+	struct clk *sai_mclk;
 	dma_addr_t phys_addr;
 	unsigned int mclk_rate;
 	unsigned int id;
@@ -251,6 +256,177 @@ static const struct snd_kcontrol_new iec958_ctls = {
 	.put = snd_pcm_iec958_put,
 };
 
+struct stm32_sai_mclk_data {
+	struct clk_hw hw;
+	unsigned long freq;
+	struct stm32_sai_sub_data *sai_data;
+};
+
+#define to_mclk_data(_hw) container_of(_hw, struct stm32_sai_mclk_data, hw)
+#define STM32_SAI_MAX_CLKS 1
+
+static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned long input_rate,
+				 unsigned long output_rate)
+{
+	int version = sai->pdata->conf->version;
+	int div;
+
+	div = DIV_ROUND_CLOSEST(input_rate, output_rate);
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+	dev_dbg(&sai->pdev->dev, "SAI divider %d\n", div);
+
+	if (input_rate % div)
+		dev_dbg(&sai->pdev->dev,
+			"Rate not accurate. requested (%ld), actual (%ld)\n",
+			output_rate, input_rate / div);
+
+	return div;
+}
+
+static int stm32_sai_set_clk_div(struct stm32_sai_sub_data *sai,
+				 unsigned int div)
+{
+	int version = sai->pdata->conf->version;
+	int ret, cr1, mask;
+
+	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
+		return -EINVAL;
+	}
+
+	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
+	cr1 = SAI_XCR1_MCKDIV_SET(div);
+	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
+	if (ret < 0)
+		dev_err(&sai->pdev->dev, "Failed to update CR1 register\n");
+
+	return ret;
+}
+
+static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long *prate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	int div;
+
+	div = stm32_sai_get_clk_div(sai, *prate, rate);
+	if (div < 0)
+		return div;
+
+	mclk->freq = *prate / div;
+
+	return mclk->freq;
+}
+
+static unsigned long stm32_sai_mclk_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+
+	return mclk->freq;
+}
+
+static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long parent_rate)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+	unsigned int div;
+	int ret;
+
+	div = stm32_sai_get_clk_div(sai, parent_rate, rate);
+	if (div < 0)
+		return div;
+
+	ret = stm32_sai_set_clk_div(sai, div);
+	if (ret)
+		return ret;
+
+	mclk->freq = rate;
+
+	return 0;
+}
+
+static int stm32_sai_mclk_enable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Enable master clock\n");
+
+	return regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
+				  SAI_XCR1_MCKEN, SAI_XCR1_MCKEN);
+}
+
+static void stm32_sai_mclk_disable(struct clk_hw *hw)
+{
+	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
+	struct stm32_sai_sub_data *sai = mclk->sai_data;
+
+	dev_dbg(&sai->pdev->dev, "Disable master clock\n");
+
+	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_MCKEN, 0);
+}
+
+static const struct clk_ops mclk_ops = {
+	.enable = stm32_sai_mclk_enable,
+	.disable = stm32_sai_mclk_disable,
+	.recalc_rate = stm32_sai_mclk_recalc_rate,
+	.round_rate = stm32_sai_mclk_round_rate,
+	.set_rate = stm32_sai_mclk_set_rate,
+};
+
+static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai)
+{
+	struct clk_hw *hw;
+	struct stm32_sai_mclk_data *mclk;
+	struct device *dev = &sai->pdev->dev;
+	const char *pname = __clk_get_name(sai->sai_ck);
+	char *mclk_name, *p, *s = (char *)pname;
+	int ret, i = 0;
+
+	mclk = devm_kzalloc(dev, sizeof(mclk), GFP_KERNEL);
+	if (!mclk)
+		return -ENOMEM;
+
+	mclk_name = devm_kcalloc(dev, sizeof(char),
+				 SAI_MCLK_NAME_LEN, GFP_KERNEL);
+	if (!mclk_name)
+		return -ENOMEM;
+
+	/*
+	 * Forge mclk clock name from parent clock name and suffix.
+	 * String after "_" char is stripped in parent name.
+	 */
+	p = mclk_name;
+	while (*s && *s != '_' && (i < (SAI_MCLK_NAME_LEN - 6))) {
+		*p++ = *s++;
+		i++;
+	}
+	STM_SAI_IS_SUB_A(sai) ?
+		strncat(p, "a_mclk", 6) : strncat(p, "b_mclk", 6);
+
+	mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0);
+	mclk->sai_data = sai;
+	hw = &mclk->hw;
+
+	dev_dbg(dev, "Register master clock %s\n", mclk_name);
+	ret = devm_clk_hw_register(&sai->pdev->dev, hw);
+	if (ret) {
+		dev_err(dev, "mclk register returned %d\n", ret);
+		return ret;
+	}
+	sai->sai_mclk = hw->clk;
+
+	/* register mclk provider */
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
+}
+
 static irqreturn_t stm32_sai_isr(int irq, void *devid)
 {
 	struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
@@ -312,15 +488,25 @@ static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int ret;
 
-	if ((dir == SND_SOC_CLOCK_OUT) && sai->master) {
+	if (dir == SND_SOC_CLOCK_OUT) {
 		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
 					 SAI_XCR1_NODIV,
 					 (unsigned int)~SAI_XCR1_NODIV);
 		if (ret < 0)
 			return ret;
 
-		sai->mclk_rate = freq;
 		dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
+		sai->mclk_rate = freq;
+
+		if (sai->sai_mclk) {
+			ret = clk_set_rate_exclusive(sai->sai_mclk,
+						     sai->mclk_rate);
+			if (ret) {
+				dev_err(cpu_dai->dev,
+					"Could not set mclk rate\n");
+				return ret;
+			}
+		}
 	}
 
 	return 0;
@@ -715,15 +901,9 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 {
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int cr1, mask, div = 0;
-	int sai_clk_rate, mclk_ratio, den, ret;
-	int version = sai->pdata->conf->version;
+	int sai_clk_rate, mclk_ratio, den;
 	unsigned int rate = params_rate(params);
 
-	if (!sai->mclk_rate) {
-		dev_err(cpu_dai->dev, "Mclk rate is null\n");
-		return -EINVAL;
-	}
-
 	if (!(rate % 11025))
 		clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k);
 	else
@@ -731,14 +911,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 	sai_clk_rate = clk_get_rate(sai->sai_ck);
 
 	if (STM_SAI_IS_F4(sai->pdata)) {
-		/*
-		 * mclk_rate = 256 * fs
-		 * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
-		 * MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		/* mclk on (NODIV=0)
+		 *   mclk_rate = 256 * fs
+		 *   MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
+		 *   MCKDIV = sai_ck / (2 * mclk_rate) otherwise
+		 * mclk off (NODIV=1)
+		 *   MCKDIV ignored. sck = sai_ck
 		 */
-		if (2 * sai_clk_rate >= 3 * sai->mclk_rate)
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						2 * sai->mclk_rate);
+		if (!sai->mclk_rate)
+			return 0;
+
+		if (2 * sai_clk_rate >= 3 * sai->mclk_rate) {
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    2 * sai->mclk_rate);
+			if (div < 0)
+				return div;
+		}
 	} else {
 		/*
 		 * TDM mode :
@@ -750,8 +938,10 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 		 * Note: NOMCK/NODIV correspond to same bit.
 		 */
 		if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
-			div = DIV_ROUND_CLOSEST(sai_clk_rate,
-						(params_rate(params) * 128));
+			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+						    rate * 128);
+			if (div < 0)
+				return div;
 		} else {
 			if (sai->mclk_rate) {
 				mclk_ratio = sai->mclk_rate / rate;
@@ -764,31 +954,22 @@ static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
 						mclk_ratio);
 					return -EINVAL;
 				}
-				div = DIV_ROUND_CLOSEST(sai_clk_rate,
-							sai->mclk_rate);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    sai->mclk_rate);
+				if (div < 0)
+					return div;
 			} else {
 				/* mclk-fs not set, master clock not active */
 				den = sai->fs_length * params_rate(params);
-				div = DIV_ROUND_CLOSEST(sai_clk_rate, den);
+				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
+							    den);
+				if (div < 0)
+					return div;
 			}
 		}
 	}
 
-	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
-		dev_err(cpu_dai->dev, "Divider %d out of range\n", div);
-		return -EINVAL;
-	}
-	dev_dbg(cpu_dai->dev, "SAI clock %d, divider %d\n", sai_clk_rate, div);
-
-	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
-	cr1 = SAI_XCR1_MCKDIV_SET(div);
-	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
-	if (ret < 0) {
-		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
-		return ret;
-	}
-
-	return 0;
+	return stm32_sai_set_clk_div(sai, div);
 }
 
 static int stm32_sai_hw_params(struct snd_pcm_substream *substream,
@@ -881,6 +1062,9 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
 			   SAI_XCR1_NODIV);
 
 	clk_disable_unprepare(sai->sai_ck);
+
+	clk_rate_exclusive_put(sai->sai_mclk);
+
 	sai->substream = NULL;
 }
 
@@ -903,6 +1087,8 @@ static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
 	int cr1 = 0, cr1_mask;
 
+	sai->cpu_dai = cpu_dai;
+
 	sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX);
 	/*
 	 * DMA supports 4, 8 or 16 burst sizes. Burst size 4 is the best choice,
@@ -1181,6 +1367,23 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
 		return PTR_ERR(sai->sai_ck);
 	}
 
+	if (STM_SAI_IS_F4(sai->pdata))
+		return 0;
+
+	/* Register mclk provider if requested */
+	if (of_find_property(np, "#clock-cells", NULL)) {
+		ret = stm32_sai_add_mclk_provider(sai);
+		if (ret < 0)
+			return ret;
+	} else {
+		sai->sai_mclk = devm_clk_get(&pdev->dev, "MCLK");
+		if (IS_ERR(sai->sai_mclk)) {
+			if (PTR_ERR(sai->sai_mclk) != -ENOENT)
+				return PTR_ERR(sai->sai_mclk);
+			sai->sai_mclk = NULL;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.19.0.rc2

[PATCH 4/4] ASoC: cs42l51: add mclk support

[Olivier Moysan]

Add MCLK dapm to allow configuration of cirrus CS42l51
codec as a master clock consumer.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 sound/soc/codecs/cs42l51.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 5080d7a3c279..eb40bff54cec 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -237,6 +237,10 @@ static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
 		&cs42l51_adcr_mux_controls),
 };
 
+static const struct snd_soc_dapm_widget cs42l51_dapm_mclk_widgets[] = {
+	SND_SOC_DAPM_CLOCK_SUPPLY("MCLK")
+};
+
 static const struct snd_soc_dapm_route cs42l51_routes[] = {
 	{"HPL", NULL, "Left DAC"},
 	{"HPR", NULL, "Right DAC"},
@@ -487,6 +491,10 @@ static struct snd_soc_dai_driver cs42l51_dai = {
 static int cs42l51_component_probe(struct snd_soc_component *component)
 {
 	int ret, reg;
+	struct snd_soc_dapm_context *dapm;
+
+	dapm = snd_soc_component_get_dapm(component);
+	snd_soc_dapm_new_controls(dapm, cs42l51_dapm_mclk_widgets, 1);
 
 	/*
 	 * DAC configuration
-- 
2.7.4

Applied "ASoC: cs42l51: add mclk support" to the asoc tree

[Mark Brown]

The patch

   ASoC: cs42l51: add mclk support

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 5e8d63a726f8f2fef089515e9a501785cc67dcdc Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:36 +0200
Subject: [PATCH] ASoC: cs42l51: add mclk support

Add MCLK dapm to allow configuration of cirrus CS42l51
codec as a master clock consumer.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/cs42l51.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 5080d7a3c279..eb40bff54cec 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -237,6 +237,10 @@ static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
 		&cs42l51_adcr_mux_controls),
 };
 
+static const struct snd_soc_dapm_widget cs42l51_dapm_mclk_widgets[] = {
+	SND_SOC_DAPM_CLOCK_SUPPLY("MCLK")
+};
+
 static const struct snd_soc_dapm_route cs42l51_routes[] = {
 	{"HPL", NULL, "Left DAC"},
 	{"HPR", NULL, "Right DAC"},
@@ -487,6 +491,10 @@ static struct snd_soc_dai_driver cs42l51_dai = {
 static int cs42l51_component_probe(struct snd_soc_component *component)
 {
 	int ret, reg;
+	struct snd_soc_dapm_context *dapm;
+
+	dapm = snd_soc_component_get_dapm(component);
+	snd_soc_dapm_new_controls(dapm, cs42l51_dapm_mclk_widgets, 1);
 
 	/*
 	 * DAC configuration
-- 
2.19.0.rc2

Applied "ASoC: cs42l51: add mclk support" to the asoc tree

[Mark Brown]

The patch

   ASoC: cs42l51: add mclk support

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 5e8d63a726f8f2fef089515e9a501785cc67dcdc Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Mon, 15 Oct 2018 16:03:36 +0200
Subject: [PATCH] ASoC: cs42l51: add mclk support

Add MCLK dapm to allow configuration of cirrus CS42l51
codec as a master clock consumer.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/cs42l51.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 5080d7a3c279..eb40bff54cec 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -237,6 +237,10 @@ static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
 		&cs42l51_adcr_mux_controls),
 };
 
+static const struct snd_soc_dapm_widget cs42l51_dapm_mclk_widgets[] = {
+	SND_SOC_DAPM_CLOCK_SUPPLY("MCLK")
+};
+
 static const struct snd_soc_dapm_route cs42l51_routes[] = {
 	{"HPL", NULL, "Left DAC"},
 	{"HPR", NULL, "Right DAC"},
@@ -487,6 +491,10 @@ static struct snd_soc_dai_driver cs42l51_dai = {
 static int cs42l51_component_probe(struct snd_soc_component *component)
 {
 	int ret, reg;
+	struct snd_soc_dapm_context *dapm;
+
+	dapm = snd_soc_component_get_dapm(component);
+	snd_soc_dapm_new_controls(dapm, cs42l51_dapm_mclk_widgets, 1);
 
 	/*
 	 * DAC configuration
-- 
2.19.0.rc2