[PATCH v4 1/8] mmc: sdhci-of-arasan: Separate out clk related data to another structure

[PATCH v4 1/8] mmc: sdhci-of-arasan: Separate out clk related data to another structure

[Manish Narani]

To improve the code readability, use two different structs, one for
clock provider data and one for mmc platform data.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 31 ++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 7023cbec4017..701b6cc0f9a3 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -71,14 +71,23 @@ struct sdhci_arasan_soc_ctl_map {
 	bool					hiword_update;
 };
 
+/**
+ * struct sdhci_arasan_clk_data
+ * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
+ * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ */
+struct sdhci_arasan_clk_data {
+	struct clk_hw	sdcardclk_hw;
+	struct clk      *sdcardclk;
+};
+
 /**
  * struct sdhci_arasan_data
  * @host:		Pointer to the main SDHCI host structure.
  * @clk_ahb:		Pointer to the AHB clock
  * @phy:		Pointer to the generic phy
  * @is_phy_on:		True if the PHY is on; false if not.
- * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
- * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ * @clk_data:		Struct for the Arasan Controller Clock Data.
  * @soc_ctl_base:	Pointer to regmap for syscon for soc_ctl registers.
  * @soc_ctl_map:	Map to get offsets into soc_ctl registers.
  */
@@ -89,8 +98,7 @@ struct sdhci_arasan_data {
 	bool		is_phy_on;
 
 	bool		has_cqe;
-	struct clk_hw	sdcardclk_hw;
-	struct clk      *sdcardclk;
+	struct sdhci_arasan_clk_data clk_data;
 
 	struct regmap	*soc_ctl_base;
 	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
@@ -520,8 +528,10 @@ static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
 						      unsigned long parent_rate)
 
 {
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
 	struct sdhci_arasan_data *sdhci_arasan =
-		container_of(hw, struct sdhci_arasan_data, sdcardclk_hw);
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
 	struct sdhci_host *host = sdhci_arasan->host;
 
 	return host->mmc->actual_clock;
@@ -633,6 +643,7 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 				       struct clk *clk_xin,
 				       struct device *dev)
 {
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	struct device_node *np = dev->of_node;
 	struct clk_init_data sdcardclk_init;
 	const char *parent_clk_name;
@@ -655,13 +666,13 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
 	sdcardclk_init.ops = &arasan_sdcardclk_ops;
 
-	sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init;
-	sdhci_arasan->sdcardclk =
-		devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw);
-	sdhci_arasan->sdcardclk_hw.init = NULL;
+	clk_data->sdcardclk_hw.init = &sdcardclk_init;
+	clk_data->sdcardclk =
+		devm_clk_register(dev, &clk_data->sdcardclk_hw);
+	clk_data->sdcardclk_hw.init = NULL;
 
 	ret = of_clk_add_provider(np, of_clk_src_simple_get,
-				  sdhci_arasan->sdcardclk);
+				  clk_data->sdcardclk);
 	if (ret)
 		dev_err(dev, "Failed to add clock provider\n");
 
-- 
2.17.1

[PATCH v4 1/8] mmc: sdhci-of-arasan: Separate out clk related data to another structure

[Manish Narani]

To improve the code readability, use two different structs, one for
clock provider data and one for mmc platform data.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 31 ++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 7023cbec4017..701b6cc0f9a3 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -71,14 +71,23 @@ struct sdhci_arasan_soc_ctl_map {
 	bool					hiword_update;
 };
 
+/**
+ * struct sdhci_arasan_clk_data
+ * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
+ * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ */
+struct sdhci_arasan_clk_data {
+	struct clk_hw	sdcardclk_hw;
+	struct clk      *sdcardclk;
+};
+
 /**
  * struct sdhci_arasan_data
  * @host:		Pointer to the main SDHCI host structure.
  * @clk_ahb:		Pointer to the AHB clock
  * @phy:		Pointer to the generic phy
  * @is_phy_on:		True if the PHY is on; false if not.
- * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
- * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ * @clk_data:		Struct for the Arasan Controller Clock Data.
  * @soc_ctl_base:	Pointer to regmap for syscon for soc_ctl registers.
  * @soc_ctl_map:	Map to get offsets into soc_ctl registers.
  */
@@ -89,8 +98,7 @@ struct sdhci_arasan_data {
 	bool		is_phy_on;
 
 	bool		has_cqe;
-	struct clk_hw	sdcardclk_hw;
-	struct clk      *sdcardclk;
+	struct sdhci_arasan_clk_data clk_data;
 
 	struct regmap	*soc_ctl_base;
 	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
@@ -520,8 +528,10 @@ static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
 						      unsigned long parent_rate)
 
 {
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
 	struct sdhci_arasan_data *sdhci_arasan =
-		container_of(hw, struct sdhci_arasan_data, sdcardclk_hw);
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
 	struct sdhci_host *host = sdhci_arasan->host;
 
 	return host->mmc->actual_clock;
@@ -633,6 +643,7 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 				       struct clk *clk_xin,
 				       struct device *dev)
 {
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	struct device_node *np = dev->of_node;
 	struct clk_init_data sdcardclk_init;
 	const char *parent_clk_name;
@@ -655,13 +666,13 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
 	sdcardclk_init.ops = &arasan_sdcardclk_ops;
 
-	sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init;
-	sdhci_arasan->sdcardclk =
-		devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw);
-	sdhci_arasan->sdcardclk_hw.init = NULL;
+	clk_data->sdcardclk_hw.init = &sdcardclk_init;
+	clk_data->sdcardclk =
+		devm_clk_register(dev, &clk_data->sdcardclk_hw);
+	clk_data->sdcardclk_hw.init = NULL;
 
 	ret = of_clk_add_provider(np, of_clk_src_simple_get,
-				  sdhci_arasan->sdcardclk);
+				  clk_data->sdcardclk);
 	if (ret)
 		dev_err(dev, "Failed to add clock provider\n");
 
-- 
2.17.1

[PATCH v4 1/8] mmc: sdhci-of-arasan: Separate out clk related data to another structure

[Manish Narani]

To improve the code readability, use two different structs, one for
clock provider data and one for mmc platform data.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 31 ++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 7023cbec4017..701b6cc0f9a3 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -71,14 +71,23 @@ struct sdhci_arasan_soc_ctl_map {
 	bool					hiword_update;
 };
 
+/**
+ * struct sdhci_arasan_clk_data
+ * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
+ * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ */
+struct sdhci_arasan_clk_data {
+	struct clk_hw	sdcardclk_hw;
+	struct clk      *sdcardclk;
+};
+
 /**
  * struct sdhci_arasan_data
  * @host:		Pointer to the main SDHCI host structure.
  * @clk_ahb:		Pointer to the AHB clock
  * @phy:		Pointer to the generic phy
  * @is_phy_on:		True if the PHY is on; false if not.
- * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
- * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ * @clk_data:		Struct for the Arasan Controller Clock Data.
  * @soc_ctl_base:	Pointer to regmap for syscon for soc_ctl registers.
  * @soc_ctl_map:	Map to get offsets into soc_ctl registers.
  */
@@ -89,8 +98,7 @@ struct sdhci_arasan_data {
 	bool		is_phy_on;
 
 	bool		has_cqe;
-	struct clk_hw	sdcardclk_hw;
-	struct clk      *sdcardclk;
+	struct sdhci_arasan_clk_data clk_data;
 
 	struct regmap	*soc_ctl_base;
 	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
@@ -520,8 +528,10 @@ static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
 						      unsigned long parent_rate)
 
 {
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
 	struct sdhci_arasan_data *sdhci_arasan =
-		container_of(hw, struct sdhci_arasan_data, sdcardclk_hw);
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
 	struct sdhci_host *host = sdhci_arasan->host;
 
 	return host->mmc->actual_clock;
@@ -633,6 +643,7 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 				       struct clk *clk_xin,
 				       struct device *dev)
 {
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	struct device_node *np = dev->of_node;
 	struct clk_init_data sdcardclk_init;
 	const char *parent_clk_name;
@@ -655,13 +666,13 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
 	sdcardclk_init.ops = &arasan_sdcardclk_ops;
 
-	sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init;
-	sdhci_arasan->sdcardclk =
-		devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw);
-	sdhci_arasan->sdcardclk_hw.init = NULL;
+	clk_data->sdcardclk_hw.init = &sdcardclk_init;
+	clk_data->sdcardclk =
+		devm_clk_register(dev, &clk_data->sdcardclk_hw);
+	clk_data->sdcardclk_hw.init = NULL;
 
 	ret = of_clk_add_provider(np, of_clk_src_simple_get,
-				  sdhci_arasan->sdcardclk);
+				  clk_data->sdcardclk);
 	if (ret)
 		dev_err(dev, "Failed to add clock provider\n");
 
-- 
2.17.1


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[PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Manish Narani]

Add documentation for an optional input clock which is essentially used
in sampling the input data coming from the card.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index 7ca0aa7ccc0b..b51e40b2e0c5 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -38,9 +38,9 @@ Optional Properties:
   - clock-output-names: If specified, this will be the name of the card clock
     which will be exposed by this device.  Required if #clock-cells is
     specified.
-  - #clock-cells: If specified this should be the value <0>.  With this property
-    in place we will export a clock representing the Card Clock.  This clock
-    is expected to be consumed by our PHY.  You must also specify
+  - #clock-cells: If specified this should be the value <0> or <1>. With this
+    property in place we will export one or two clocks representing the Card
+    Clock. These clocks are expected to be consumed by our PHY.
   - xlnx,fails-without-test-cd: when present, the controller doesn't work when
     the CD line is not connected properly, and the line is not connected
     properly. Test mode can be used to force the controller to function.
-- 
2.17.1

[PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Manish Narani]

Add documentation for an optional input clock which is essentially used
in sampling the input data coming from the card.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index 7ca0aa7ccc0b..b51e40b2e0c5 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -38,9 +38,9 @@ Optional Properties:
   - clock-output-names: If specified, this will be the name of the card clock
     which will be exposed by this device.  Required if #clock-cells is
     specified.
-  - #clock-cells: If specified this should be the value <0>.  With this property
-    in place we will export a clock representing the Card Clock.  This clock
-    is expected to be consumed by our PHY.  You must also specify
+  - #clock-cells: If specified this should be the value <0> or <1>. With this
+    property in place we will export one or two clocks representing the Card
+    Clock. These clocks are expected to be consumed by our PHY.
   - xlnx,fails-without-test-cd: when present, the controller doesn't work when
     the CD line is not connected properly, and the line is not connected
     properly. Test mode can be used to force the controller to function.
-- 
2.17.1


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[PATCH v4 3/8] mmc: sdhci-of-arasan: Add sampling clock for a phy to use

[Manish Narani]

There are some operations like setting the clock delays may need to have
two clocks, one for output path and one for input path. Adding input
path clock for some phys to use.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 151 +++++++++++++++++++++++++----
 1 file changed, 134 insertions(+), 17 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 701b6cc0f9a3..b75ba780f902 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -75,10 +75,14 @@ struct sdhci_arasan_soc_ctl_map {
  * struct sdhci_arasan_clk_data
  * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
  * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ * @sampleclk_hw:	Struct for the clock we might provide to a PHY.
+ * @sampleclk:		Pointer to normal 'struct clock' for sampleclk_hw.
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
 	struct clk      *sdcardclk;
+	struct clk_hw	sampleclk_hw;
+	struct clk      *sampleclk;
 };
 
 /**
@@ -541,6 +545,33 @@ static const struct clk_ops arasan_sdcardclk_ops = {
 	.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
 };
 
+/**
+ * sdhci_arasan_sampleclk_recalc_rate - Return the sampling clock rate
+ *
+ * Return the current actual rate of the sampling clock.  This can be used
+ * to communicate with out PHY.
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @parent_rate		The parent rate (should be rate of clk_xin).
+ * Returns the sample clock rate.
+ */
+static unsigned long sdhci_arasan_sampleclk_recalc_rate(struct clk_hw *hw,
+						      unsigned long parent_rate)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+
+	return host->mmc->actual_clock;
+}
+
+static const struct clk_ops arasan_sampleclk_ops = {
+	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
+};
+
 /**
  * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
  *
@@ -620,28 +651,21 @@ static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
 }
 
 /**
- * sdhci_arasan_register_sdclk - Register the sdclk for a PHY to use
+ * sdhci_arasan_register_sdcardclk - Register the sdcardclk for a PHY to use
  *
  * Some PHY devices need to know what the actual card clock is.  In order for
  * them to find out, we'll provide a clock through the common clock framework
  * for them to query.
  *
- * Note: without seriously re-architecting SDHCI's clock code and testing on
- * all platforms, there's no way to create a totally beautiful clock here
- * with all clock ops implemented.  Instead, we'll just create a clock that can
- * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
- * framework that we're doing things behind its back.  This should be sufficient
- * to create nice clean device tree bindings and later (if needed) we can try
- * re-architecting SDHCI if we see some benefit to it.
- *
  * @sdhci_arasan:	Our private data structure.
  * @clk_xin:		Pointer to the functional clock
  * @dev:		Pointer to our struct device.
  * Returns 0 on success and error value on error
  */
-static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
-				       struct clk *clk_xin,
-				       struct device *dev)
+static int
+sdhci_arasan_register_sdcardclk(struct sdhci_arasan_data *sdhci_arasan,
+				struct clk *clk_xin,
+				struct device *dev)
 {
 	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	struct device_node *np = dev->of_node;
@@ -649,10 +673,6 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	const char *parent_clk_name;
 	int ret;
 
-	/* Providing a clock to the PHY is optional; no error if missing */
-	if (!of_find_property(np, "#clock-cells", NULL))
-		return 0;
-
 	ret = of_property_read_string_index(np, "clock-output-names", 0,
 					    &sdcardclk_init.name);
 	if (ret) {
@@ -674,7 +694,56 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	ret = of_clk_add_provider(np, of_clk_src_simple_get,
 				  clk_data->sdcardclk);
 	if (ret)
-		dev_err(dev, "Failed to add clock provider\n");
+		dev_err(dev, "Failed to add sdcard clock provider\n");
+
+	return ret;
+}
+
+/**
+ * sdhci_arasan_register_sampleclk - Register the sampleclk for a PHY to use
+ *
+ * Some PHY devices need to know what the actual card clock is.  In order for
+ * them to find out, we'll provide a clock through the common clock framework
+ * for them to query.
+ *
+ * @sdhci_arasan:	Our private data structure.
+ * @clk_xin:		Pointer to the functional clock
+ * @dev:		Pointer to our struct device.
+ * Returns 0 on success and error value on error
+ */
+static int
+sdhci_arasan_register_sampleclk(struct sdhci_arasan_data *sdhci_arasan,
+				struct clk *clk_xin,
+				struct device *dev)
+{
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
+	struct device_node *np = dev->of_node;
+	struct clk_init_data sampleclk_init;
+	const char *parent_clk_name;
+	int ret;
+
+	ret = of_property_read_string_index(np, "clock-output-names", 1,
+					    &sampleclk_init.name);
+	if (ret) {
+		dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
+		return ret;
+	}
+
+	parent_clk_name = __clk_get_name(clk_xin);
+	sampleclk_init.parent_names = &parent_clk_name;
+	sampleclk_init.num_parents = 1;
+	sampleclk_init.flags = CLK_GET_RATE_NOCACHE;
+	sampleclk_init.ops = &arasan_sampleclk_ops;
+
+	clk_data->sampleclk_hw.init = &sampleclk_init;
+	clk_data->sampleclk =
+		devm_clk_register(dev, &clk_data->sampleclk_hw);
+	clk_data->sampleclk_hw.init = NULL;
+
+	ret = of_clk_add_provider(np, of_clk_src_simple_get,
+				  clk_data->sampleclk);
+	if (ret)
+		dev_err(dev, "Failed to add sample clock provider\n");
 
 	return ret;
 }
@@ -697,6 +766,54 @@ static void sdhci_arasan_unregister_sdclk(struct device *dev)
 	of_clk_del_provider(dev->of_node);
 }
 
+/**
+ * sdhci_arasan_register_sdclk - Register the sdcardclk for a PHY to use
+ *
+ * Some PHY devices need to know what the actual card clock is.  In order for
+ * them to find out, we'll provide a clock through the common clock framework
+ * for them to query.
+ *
+ * Note: without seriously re-architecting SDHCI's clock code and testing on
+ * all platforms, there's no way to create a totally beautiful clock here
+ * with all clock ops implemented.  Instead, we'll just create a clock that can
+ * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
+ * framework that we're doing things behind its back.  This should be sufficient
+ * to create nice clean device tree bindings and later (if needed) we can try
+ * re-architecting SDHCI if we see some benefit to it.
+ *
+ * @sdhci_arasan:	Our private data structure.
+ * @clk_xin:		Pointer to the functional clock
+ * @dev:		Pointer to our struct device.
+ * Returns 0 on success and error value on error
+ */
+static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
+				       struct clk *clk_xin,
+				       struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	u32 num_clks = 0;
+	int ret;
+
+	/* Providing a clock to the PHY is optional; no error if missing */
+	if (of_property_read_u32(np, "#clock-cells", &num_clks) < 0)
+		return 0;
+
+	ret = sdhci_arasan_register_sdcardclk(sdhci_arasan, clk_xin, dev);
+	if (ret)
+		return ret;
+
+	if (num_clks) {
+		ret = sdhci_arasan_register_sampleclk(sdhci_arasan, clk_xin,
+						      dev);
+		if (ret) {
+			sdhci_arasan_unregister_sdclk(dev);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
 {
 	struct sdhci_host *host = sdhci_arasan->host;
-- 
2.17.1

[PATCH v4 3/8] mmc: sdhci-of-arasan: Add sampling clock for a phy to use

[Manish Narani]

There are some operations like setting the clock delays may need to have
two clocks, one for output path and one for input path. Adding input
path clock for some phys to use.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 151 +++++++++++++++++++++++++----
 1 file changed, 134 insertions(+), 17 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 701b6cc0f9a3..b75ba780f902 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -75,10 +75,14 @@ struct sdhci_arasan_soc_ctl_map {
  * struct sdhci_arasan_clk_data
  * @sdcardclk_hw:	Struct for the clock we might provide to a PHY.
  * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
+ * @sampleclk_hw:	Struct for the clock we might provide to a PHY.
+ * @sampleclk:		Pointer to normal 'struct clock' for sampleclk_hw.
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
 	struct clk      *sdcardclk;
+	struct clk_hw	sampleclk_hw;
+	struct clk      *sampleclk;
 };
 
 /**
@@ -541,6 +545,33 @@ static const struct clk_ops arasan_sdcardclk_ops = {
 	.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
 };
 
+/**
+ * sdhci_arasan_sampleclk_recalc_rate - Return the sampling clock rate
+ *
+ * Return the current actual rate of the sampling clock.  This can be used
+ * to communicate with out PHY.
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @parent_rate		The parent rate (should be rate of clk_xin).
+ * Returns the sample clock rate.
+ */
+static unsigned long sdhci_arasan_sampleclk_recalc_rate(struct clk_hw *hw,
+						      unsigned long parent_rate)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+
+	return host->mmc->actual_clock;
+}
+
+static const struct clk_ops arasan_sampleclk_ops = {
+	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
+};
+
 /**
  * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
  *
@@ -620,28 +651,21 @@ static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
 }
 
 /**
- * sdhci_arasan_register_sdclk - Register the sdclk for a PHY to use
+ * sdhci_arasan_register_sdcardclk - Register the sdcardclk for a PHY to use
  *
  * Some PHY devices need to know what the actual card clock is.  In order for
  * them to find out, we'll provide a clock through the common clock framework
  * for them to query.
  *
- * Note: without seriously re-architecting SDHCI's clock code and testing on
- * all platforms, there's no way to create a totally beautiful clock here
- * with all clock ops implemented.  Instead, we'll just create a clock that can
- * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
- * framework that we're doing things behind its back.  This should be sufficient
- * to create nice clean device tree bindings and later (if needed) we can try
- * re-architecting SDHCI if we see some benefit to it.
- *
  * @sdhci_arasan:	Our private data structure.
  * @clk_xin:		Pointer to the functional clock
  * @dev:		Pointer to our struct device.
  * Returns 0 on success and error value on error
  */
-static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
-				       struct clk *clk_xin,
-				       struct device *dev)
+static int
+sdhci_arasan_register_sdcardclk(struct sdhci_arasan_data *sdhci_arasan,
+				struct clk *clk_xin,
+				struct device *dev)
 {
 	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	struct device_node *np = dev->of_node;
@@ -649,10 +673,6 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	const char *parent_clk_name;
 	int ret;
 
-	/* Providing a clock to the PHY is optional; no error if missing */
-	if (!of_find_property(np, "#clock-cells", NULL))
-		return 0;
-
 	ret = of_property_read_string_index(np, "clock-output-names", 0,
 					    &sdcardclk_init.name);
 	if (ret) {
@@ -674,7 +694,56 @@ static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
 	ret = of_clk_add_provider(np, of_clk_src_simple_get,
 				  clk_data->sdcardclk);
 	if (ret)
-		dev_err(dev, "Failed to add clock provider\n");
+		dev_err(dev, "Failed to add sdcard clock provider\n");
+
+	return ret;
+}
+
+/**
+ * sdhci_arasan_register_sampleclk - Register the sampleclk for a PHY to use
+ *
+ * Some PHY devices need to know what the actual card clock is.  In order for
+ * them to find out, we'll provide a clock through the common clock framework
+ * for them to query.
+ *
+ * @sdhci_arasan:	Our private data structure.
+ * @clk_xin:		Pointer to the functional clock
+ * @dev:		Pointer to our struct device.
+ * Returns 0 on success and error value on error
+ */
+static int
+sdhci_arasan_register_sampleclk(struct sdhci_arasan_data *sdhci_arasan,
+				struct clk *clk_xin,
+				struct device *dev)
+{
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
+	struct device_node *np = dev->of_node;
+	struct clk_init_data sampleclk_init;
+	const char *parent_clk_name;
+	int ret;
+
+	ret = of_property_read_string_index(np, "clock-output-names", 1,
+					    &sampleclk_init.name);
+	if (ret) {
+		dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
+		return ret;
+	}
+
+	parent_clk_name = __clk_get_name(clk_xin);
+	sampleclk_init.parent_names = &parent_clk_name;
+	sampleclk_init.num_parents = 1;
+	sampleclk_init.flags = CLK_GET_RATE_NOCACHE;
+	sampleclk_init.ops = &arasan_sampleclk_ops;
+
+	clk_data->sampleclk_hw.init = &sampleclk_init;
+	clk_data->sampleclk =
+		devm_clk_register(dev, &clk_data->sampleclk_hw);
+	clk_data->sampleclk_hw.init = NULL;
+
+	ret = of_clk_add_provider(np, of_clk_src_simple_get,
+				  clk_data->sampleclk);
+	if (ret)
+		dev_err(dev, "Failed to add sample clock provider\n");
 
 	return ret;
 }
@@ -697,6 +766,54 @@ static void sdhci_arasan_unregister_sdclk(struct device *dev)
 	of_clk_del_provider(dev->of_node);
 }
 
+/**
+ * sdhci_arasan_register_sdclk - Register the sdcardclk for a PHY to use
+ *
+ * Some PHY devices need to know what the actual card clock is.  In order for
+ * them to find out, we'll provide a clock through the common clock framework
+ * for them to query.
+ *
+ * Note: without seriously re-architecting SDHCI's clock code and testing on
+ * all platforms, there's no way to create a totally beautiful clock here
+ * with all clock ops implemented.  Instead, we'll just create a clock that can
+ * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
+ * framework that we're doing things behind its back.  This should be sufficient
+ * to create nice clean device tree bindings and later (if needed) we can try
+ * re-architecting SDHCI if we see some benefit to it.
+ *
+ * @sdhci_arasan:	Our private data structure.
+ * @clk_xin:		Pointer to the functional clock
+ * @dev:		Pointer to our struct device.
+ * Returns 0 on success and error value on error
+ */
+static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
+				       struct clk *clk_xin,
+				       struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	u32 num_clks = 0;
+	int ret;
+
+	/* Providing a clock to the PHY is optional; no error if missing */
+	if (of_property_read_u32(np, "#clock-cells", &num_clks) < 0)
+		return 0;
+
+	ret = sdhci_arasan_register_sdcardclk(sdhci_arasan, clk_xin, dev);
+	if (ret)
+		return ret;
+
+	if (num_clks) {
+		ret = sdhci_arasan_register_sampleclk(sdhci_arasan, clk_xin,
+						      dev);
+		if (ret) {
+			sdhci_arasan_unregister_sdclk(dev);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
 {
 	struct sdhci_host *host = sdhci_arasan->host;
-- 
2.17.1


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[PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Manish Narani]

Add optional properties for Arasan SDHCI which are used to set clk delays
for different speed modes in the controller.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index b51e40b2e0c5..c0f505b6cab5 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -46,6 +46,22 @@ Optional Properties:
     properly. Test mode can be used to force the controller to function.
   - xlnx,int-clock-stable-broken: when present, the controller always reports
     that the internal clock is stable even when it is not.
+  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
+  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
+  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
+  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
+  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
+  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
+  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
+  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
+  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
+  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
+  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.
+
+  Above mentioned are the clock (phase) delays which are to be configured in the
+  controller while switching to particular speed mode. The range of values are
+  0 to 359 degrees. If not specified, driver will configure the default value
+  defined for particular mode in it.
 
 Example:
 	sdhci@e0100000 {
-- 
2.17.1

[PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Manish Narani]

Add optional properties for Arasan SDHCI which are used to set clk delays
for different speed modes in the controller.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index b51e40b2e0c5..c0f505b6cab5 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -46,6 +46,22 @@ Optional Properties:
     properly. Test mode can be used to force the controller to function.
   - xlnx,int-clock-stable-broken: when present, the controller always reports
     that the internal clock is stable even when it is not.
+  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
+  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
+  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
+  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
+  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
+  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
+  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
+  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
+  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
+  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
+  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.
+
+  Above mentioned are the clock (phase) delays which are to be configured in the
+  controller while switching to particular speed mode. The range of values are
+  0 to 359 degrees. If not specified, driver will configure the default value
+  defined for particular mode in it.
 
 Example:
 	sdhci@e0100000 {
-- 
2.17.1


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[PATCH v4 5/8] mmc: sdhci-of-arasan: Add support to set clock phase delays for SD

[Manish Narani]

Add support to read Clock Phase Delays from the DT and set it via
clk_set_phase() API from clock framework. Some of the controllers might
have their own handling of setting clock delays, for this keep the
set_clk_delays as function pointer which can be assigned controller
specific handling of the same.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 91 ++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index b75ba780f902..18eb6cffd269 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -77,12 +77,18 @@ struct sdhci_arasan_soc_ctl_map {
  * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
  * @sampleclk_hw:	Struct for the clock we might provide to a PHY.
  * @sampleclk:		Pointer to normal 'struct clock' for sampleclk_hw.
+ * @clk_phase_in:	Array of Input Clock Phase Delays for all speed modes
+ * @clk_phase_out:	Array of Output Clock Phase Delays for all speed modes
+ * @set_clk_delays:	Function pointer for setting Clock Delays
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
 	struct clk      *sdcardclk;
 	struct clk_hw	sampleclk_hw;
 	struct clk      *sampleclk;
+	int		clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
+	int		clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
+	void		(*set_clk_delays)(struct sdhci_host *host);
 };
 
 /**
@@ -186,6 +192,7 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	bool ctrl_phy = false;
 
 	if (!IS_ERR(sdhci_arasan->phy)) {
@@ -227,6 +234,10 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
 		sdhci_arasan->is_phy_on = false;
 	}
 
+	/* Set the Input and Output Clock Phase Delays */
+	if (clk_data->set_clk_delays)
+		clk_data->set_clk_delays(host);
+
 	sdhci_set_clock(host, clock);
 
 	if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE)
@@ -650,6 +661,84 @@ static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
 	sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz);
 }
 
+static void sdhci_arasan_set_clk_delays(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
+
+	clk_set_phase(clk_data->sampleclk,
+		      clk_data->clk_phase_in[host->timing]);
+	clk_set_phase(clk_data->sdcardclk,
+		      clk_data->clk_phase_out[host->timing]);
+}
+
+static void arasan_dt_read_clk_phase(struct device *dev,
+				     struct sdhci_arasan_clk_data *clk_data,
+				     unsigned int timing, const char *prop)
+{
+	struct device_node *np = dev->of_node;
+
+	int clk_phase[2] = {0};
+
+	/*
+	 * Read Tap Delay values from DT, if the DT does not contain the
+	 * Tap Values then use the pre-defined values.
+	 */
+	if (of_property_read_variable_u32_array(np, prop, &clk_phase[0],
+						2, 0)) {
+		dev_dbg(dev, "Using predefined clock phase for %s = %d %d\n",
+			prop, clk_data->clk_phase_in[timing],
+			clk_data->clk_phase_out[timing]);
+		return;
+	}
+
+	/* The values read are Input and Output Clock Delays in order */
+	clk_data->clk_phase_in[timing] = clk_phase[0];
+	clk_data->clk_phase_out[timing] = clk_phase[1];
+}
+
+/**
+ * arasan_dt_parse_clk_phases - Read Clock Delay values from DT
+ *
+ * Called at initialization to parse the values of Clock Delays.
+ *
+ * @dev:		Pointer to our struct device.
+ */
+static void arasan_dt_parse_clk_phases(struct device *dev,
+				       struct sdhci_arasan_clk_data *clk_data)
+{
+	/*
+	 * This has been kept as a pointer and is assigned a function here.
+	 * So that different controller variants can assign their own handling
+	 * function.
+	 */
+	clk_data->set_clk_delays = sdhci_arasan_set_clk_delays;
+
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
+				 "arasan-clk-phase-legacy");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
+				 "arasan-clk-phase-mmc-hs");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_SD_HS,
+				 "arasan-clk-phase-sd-hs");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR12,
+				 "arasan-clk-phase-uhs-sdr12");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR25,
+				 "arasan-clk-phase-uhs-sdr25");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR50,
+				 "arasan-clk-phase-uhs-sdr50");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR104,
+				 "arasan-clk-phase-uhs-sdr104");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_DDR50,
+				 "arasan-clk-phase-uhs-ddr50");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_DDR52,
+				 "arasan-clk-phase-mmc-ddr52");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS200,
+				 "arasan-clk-phase-mmc-hs200");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS400,
+				 "arasan-clk-phase-mmc-hs400");
+}
+
 /**
  * sdhci_arasan_register_sdcardclk - Register the sdcardclk for a PHY to use
  *
@@ -942,6 +1031,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_disable_all;
 
+	arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);
+
 	ret = mmc_of_parse(host->mmc);
 	if (ret) {
 		if (ret != -EPROBE_DEFER)
-- 
2.17.1

[PATCH v4 5/8] mmc: sdhci-of-arasan: Add support to set clock phase delays for SD

[Manish Narani]

Add support to read Clock Phase Delays from the DT and set it via
clk_set_phase() API from clock framework. Some of the controllers might
have their own handling of setting clock delays, for this keep the
set_clk_delays as function pointer which can be assigned controller
specific handling of the same.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 91 ++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index b75ba780f902..18eb6cffd269 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -77,12 +77,18 @@ struct sdhci_arasan_soc_ctl_map {
  * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
  * @sampleclk_hw:	Struct for the clock we might provide to a PHY.
  * @sampleclk:		Pointer to normal 'struct clock' for sampleclk_hw.
+ * @clk_phase_in:	Array of Input Clock Phase Delays for all speed modes
+ * @clk_phase_out:	Array of Output Clock Phase Delays for all speed modes
+ * @set_clk_delays:	Function pointer for setting Clock Delays
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
 	struct clk      *sdcardclk;
 	struct clk_hw	sampleclk_hw;
 	struct clk      *sampleclk;
+	int		clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
+	int		clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
+	void		(*set_clk_delays)(struct sdhci_host *host);
 };
 
 /**
@@ -186,6 +192,7 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
 	bool ctrl_phy = false;
 
 	if (!IS_ERR(sdhci_arasan->phy)) {
@@ -227,6 +234,10 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
 		sdhci_arasan->is_phy_on = false;
 	}
 
+	/* Set the Input and Output Clock Phase Delays */
+	if (clk_data->set_clk_delays)
+		clk_data->set_clk_delays(host);
+
 	sdhci_set_clock(host, clock);
 
 	if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE)
@@ -650,6 +661,84 @@ static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
 	sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz);
 }
 
+static void sdhci_arasan_set_clk_delays(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
+
+	clk_set_phase(clk_data->sampleclk,
+		      clk_data->clk_phase_in[host->timing]);
+	clk_set_phase(clk_data->sdcardclk,
+		      clk_data->clk_phase_out[host->timing]);
+}
+
+static void arasan_dt_read_clk_phase(struct device *dev,
+				     struct sdhci_arasan_clk_data *clk_data,
+				     unsigned int timing, const char *prop)
+{
+	struct device_node *np = dev->of_node;
+
+	int clk_phase[2] = {0};
+
+	/*
+	 * Read Tap Delay values from DT, if the DT does not contain the
+	 * Tap Values then use the pre-defined values.
+	 */
+	if (of_property_read_variable_u32_array(np, prop, &clk_phase[0],
+						2, 0)) {
+		dev_dbg(dev, "Using predefined clock phase for %s = %d %d\n",
+			prop, clk_data->clk_phase_in[timing],
+			clk_data->clk_phase_out[timing]);
+		return;
+	}
+
+	/* The values read are Input and Output Clock Delays in order */
+	clk_data->clk_phase_in[timing] = clk_phase[0];
+	clk_data->clk_phase_out[timing] = clk_phase[1];
+}
+
+/**
+ * arasan_dt_parse_clk_phases - Read Clock Delay values from DT
+ *
+ * Called at initialization to parse the values of Clock Delays.
+ *
+ * @dev:		Pointer to our struct device.
+ */
+static void arasan_dt_parse_clk_phases(struct device *dev,
+				       struct sdhci_arasan_clk_data *clk_data)
+{
+	/*
+	 * This has been kept as a pointer and is assigned a function here.
+	 * So that different controller variants can assign their own handling
+	 * function.
+	 */
+	clk_data->set_clk_delays = sdhci_arasan_set_clk_delays;
+
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
+				 "arasan-clk-phase-legacy");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
+				 "arasan-clk-phase-mmc-hs");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_SD_HS,
+				 "arasan-clk-phase-sd-hs");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR12,
+				 "arasan-clk-phase-uhs-sdr12");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR25,
+				 "arasan-clk-phase-uhs-sdr25");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR50,
+				 "arasan-clk-phase-uhs-sdr50");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR104,
+				 "arasan-clk-phase-uhs-sdr104");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_DDR50,
+				 "arasan-clk-phase-uhs-ddr50");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_DDR52,
+				 "arasan-clk-phase-mmc-ddr52");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS200,
+				 "arasan-clk-phase-mmc-hs200");
+	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS400,
+				 "arasan-clk-phase-mmc-hs400");
+}
+
 /**
  * sdhci_arasan_register_sdcardclk - Register the sdcardclk for a PHY to use
  *
@@ -942,6 +1031,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_disable_all;
 
+	arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);
+
 	ret = mmc_of_parse(host->mmc);
 	if (ret) {
 		if (ret != -EPROBE_DEFER)
-- 
2.17.1


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[PATCH v4 6/8] firmware: xilinx: Add SDIO Tap Delay nodes

[Manish Narani]

Add tap delay nodes for setting SDIO Tap Delays on ZynqMP platform.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 include/linux/firmware/xlnx-zynqmp.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 778abbbc7d94..df366f1a4cb4 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -91,7 +91,8 @@ enum pm_ret_status {
 };
 
 enum pm_ioctl_id {
-	IOCTL_SET_PLL_FRAC_MODE = 8,
+	IOCTL_SET_SD_TAPDELAY = 7,
+	IOCTL_SET_PLL_FRAC_MODE,
 	IOCTL_GET_PLL_FRAC_MODE,
 	IOCTL_SET_PLL_FRAC_DATA,
 	IOCTL_GET_PLL_FRAC_DATA,
@@ -250,6 +251,16 @@ enum zynqmp_pm_request_ack {
 	ZYNQMP_PM_REQUEST_ACK_NON_BLOCKING,
 };
 
+enum pm_node_id {
+	NODE_SD_0 = 39,
+	NODE_SD_1,
+};
+
+enum tap_delay_type {
+	PM_TAPDELAY_INPUT = 0,
+	PM_TAPDELAY_OUTPUT,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID
-- 
2.17.1

[PATCH v4 6/8] firmware: xilinx: Add SDIO Tap Delay nodes

[Manish Narani]

Add tap delay nodes for setting SDIO Tap Delays on ZynqMP platform.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 include/linux/firmware/xlnx-zynqmp.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 778abbbc7d94..df366f1a4cb4 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -91,7 +91,8 @@ enum pm_ret_status {
 };
 
 enum pm_ioctl_id {
-	IOCTL_SET_PLL_FRAC_MODE = 8,
+	IOCTL_SET_SD_TAPDELAY = 7,
+	IOCTL_SET_PLL_FRAC_MODE,
 	IOCTL_GET_PLL_FRAC_MODE,
 	IOCTL_SET_PLL_FRAC_DATA,
 	IOCTL_GET_PLL_FRAC_DATA,
@@ -250,6 +251,16 @@ enum zynqmp_pm_request_ack {
 	ZYNQMP_PM_REQUEST_ACK_NON_BLOCKING,
 };
 
+enum pm_node_id {
+	NODE_SD_0 = 39,
+	NODE_SD_1,
+};
+
+enum tap_delay_type {
+	PM_TAPDELAY_INPUT = 0,
+	PM_TAPDELAY_OUTPUT,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID
-- 
2.17.1


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[PATCH v4 7/8] dt-bindings: mmc: arasan: Document 'xlnx,zynqmp-8.9a' controller

[Manish Narani]

dd documentation for 'xlnx,zynqmp-8.9a' SDHCI controller and optional
properties followed by example.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/mmc/arasan,sdhci.txt  | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index c0f505b6cab5..22fba39b94c4 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -15,6 +15,9 @@ Required Properties:
     - "arasan,sdhci-5.1": generic Arasan SDHCI 5.1 PHY
     - "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1": rk3399 eMMC PHY
       For this device it is strongly suggested to include arasan,soc-ctl-syscon.
+    - "xlnx,zynqmp-8.9a": ZynqMP SDHCI 8.9a PHY
+      For this device it is strongly suggested to include clock-output-names and
+      #clock-cells.
     - "ti,am654-sdhci-5.1", "arasan,sdhci-5.1": TI AM654 MMC PHY
 	Note: This binding has been deprecated and moved to [5].
     - "intel,lgm-sdhci-5.1-emmc", "arasan,sdhci-5.1": Intel LGM eMMC PHY
@@ -63,6 +66,10 @@ Optional Properties:
   0 to 359 degrees. If not specified, driver will configure the default value
   defined for particular mode in it.
 
+  - xlnx,mio-bank: When specified, this will indicate the MIO bank number in
+    which the command and data lines are configured. If not specified, driver
+    will assume this as 0.
+
 Example:
 	sdhci@e0100000 {
 		compatible = "arasan,sdhci-8.9a";
@@ -99,6 +106,18 @@ Example:
 		#clock-cells = <0>;
 	};
 
+	sdhci: mmc@ff160000 {
+		compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
+		interrupt-parent = <&gic>;
+		interrupts = <0 48 4>;
+		reg = <0x0 0xff160000 0x0 0x1000>;
+		clocks = <&clk200>, <&clk200>;
+		clock-names = "clk_xin", "clk_ahb";
+		clock-output-names = "clk_out_sd0", "clk_in_sd0";
+		#clock-cells = <1>;
+		arasan-clk-phase-sd-hs = <63>, <72>;
+	};
+
 	emmc: sdhci@ec700000 {
 		compatible = "intel,lgm-sdhci-5.1-emmc", "arasan,sdhci-5.1";
 		reg = <0xec700000 0x300>;
-- 
2.17.1

[PATCH v4 7/8] dt-bindings: mmc: arasan: Document 'xlnx, zynqmp-8.9a' controller

[Manish Narani]

dd documentation for 'xlnx,zynqmp-8.9a' SDHCI controller and optional
properties followed by example.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/mmc/arasan,sdhci.txt  | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index c0f505b6cab5..22fba39b94c4 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -15,6 +15,9 @@ Required Properties:
     - "arasan,sdhci-5.1": generic Arasan SDHCI 5.1 PHY
     - "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1": rk3399 eMMC PHY
       For this device it is strongly suggested to include arasan,soc-ctl-syscon.
+    - "xlnx,zynqmp-8.9a": ZynqMP SDHCI 8.9a PHY
+      For this device it is strongly suggested to include clock-output-names and
+      #clock-cells.
     - "ti,am654-sdhci-5.1", "arasan,sdhci-5.1": TI AM654 MMC PHY
 	Note: This binding has been deprecated and moved to [5].
     - "intel,lgm-sdhci-5.1-emmc", "arasan,sdhci-5.1": Intel LGM eMMC PHY
@@ -63,6 +66,10 @@ Optional Properties:
   0 to 359 degrees. If not specified, driver will configure the default value
   defined for particular mode in it.
 
+  - xlnx,mio-bank: When specified, this will indicate the MIO bank number in
+    which the command and data lines are configured. If not specified, driver
+    will assume this as 0.
+
 Example:
 	sdhci@e0100000 {
 		compatible = "arasan,sdhci-8.9a";
@@ -99,6 +106,18 @@ Example:
 		#clock-cells = <0>;
 	};
 
+	sdhci: mmc@ff160000 {
+		compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
+		interrupt-parent = <&gic>;
+		interrupts = <0 48 4>;
+		reg = <0x0 0xff160000 0x0 0x1000>;
+		clocks = <&clk200>, <&clk200>;
+		clock-names = "clk_xin", "clk_ahb";
+		clock-output-names = "clk_out_sd0", "clk_in_sd0";
+		#clock-cells = <1>;
+		arasan-clk-phase-sd-hs = <63>, <72>;
+	};
+
 	emmc: sdhci@ec700000 {
 		compatible = "intel,lgm-sdhci-5.1-emmc", "arasan,sdhci-5.1";
 		reg = <0xec700000 0x300>;
-- 
2.17.1


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[PATCH v4 8/8] mmc: sdhci-of-arasan: Add support for ZynqMP Platform Tap Delays Setup

[Manish Narani]

Apart from taps set by auto tuning, ZynqMP platform has feature to set
the tap values manually. Add support to set tap delay values in HW via
ZynqMP SoC framework.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 206 ++++++++++++++++++++++++++++-
 1 file changed, 204 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 18eb6cffd269..f488c8bb2be3 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -22,6 +22,7 @@
 #include <linux/phy/phy.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
+#include <linux/firmware/xlnx-zynqmp.h>
 
 #include "cqhci.h"
 #include "sdhci-pltfm.h"
@@ -32,6 +33,10 @@
 
 #define PHY_CLK_TOO_SLOW_HZ		400000
 
+/* Default settings for ZynqMP Clock Phases */
+#define ZYNQMP_ICLK_PHASE {0, 63, 63, 0, 63,  0,   0, 183, 54,  0, 0}
+#define ZYNQMP_OCLK_PHASE {0, 72, 60, 0, 60, 72, 135, 48, 72, 135, 0}
+
 /*
  * On some SoCs the syscon area has a feature where the upper 16-bits of
  * each 32-bit register act as a write mask for the lower 16-bits.  This allows
@@ -80,6 +85,7 @@ struct sdhci_arasan_soc_ctl_map {
  * @clk_phase_in:	Array of Input Clock Phase Delays for all speed modes
  * @clk_phase_out:	Array of Output Clock Phase Delays for all speed modes
  * @set_clk_delays:	Function pointer for setting Clock Delays
+ * @clk_of_data:	Platform specific runtime clock data storage pointer
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
@@ -89,6 +95,11 @@ struct sdhci_arasan_clk_data {
 	int		clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
 	int		clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
 	void		(*set_clk_delays)(struct sdhci_host *host);
+	void		*clk_of_data;
+};
+
+struct sdhci_arasan_zynqmp_clk_data {
+	const struct zynqmp_eemi_ops *eemi_ops;
 };
 
 /**
@@ -525,6 +536,10 @@ static const struct of_device_id sdhci_arasan_of_match[] = {
 		.compatible = "arasan,sdhci-4.9a",
 		.data = &sdhci_arasan_data,
 	},
+	{
+		.compatible = "xlnx,zynqmp-8.9a",
+		.data = &sdhci_arasan_data,
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
@@ -583,6 +598,150 @@ static const struct clk_ops arasan_sampleclk_ops = {
 	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
 };
 
+/**
+ * sdhci_zynqmp_sdcardclk_set_phase - Set the SD Output Clock Tap Delays
+ *
+ * Set the SD Output Clock Tap Delays for Output path
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @degrees		The clock phase shift between 0 - 359.
+ * Return: 0 on success and error value on error
+ */
+static int sdhci_zynqmp_sdcardclk_set_phase(struct clk_hw *hw, int degrees)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+	struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
+		clk_data->clk_of_data;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 node_id = !strcmp(clk_name, "clk_out_sd0") ? NODE_SD_0 : NODE_SD_1;
+	u8 tap_delay, tap_max = 0;
+	int ret;
+
+	/*
+	 * This is applicable for SDHCI_SPEC_300 and above
+	 * ZynqMP does not set phase for <=25MHz clock.
+	 * If degrees is zero, no need to do anything.
+	 */
+	if (host->version < SDHCI_SPEC_300 ||
+	    host->timing == MMC_TIMING_LEGACY ||
+	    host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
+		return 0;
+
+	switch (host->timing) {
+	case MMC_TIMING_MMC_HS:
+	case MMC_TIMING_SD_HS:
+	case MMC_TIMING_UHS_SDR25:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		/* For 50MHz clock, 30 Taps are available */
+		tap_max = 30;
+		break;
+	case MMC_TIMING_UHS_SDR50:
+		/* For 100MHz clock, 15 Taps are available */
+		tap_max = 15;
+		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_MMC_HS200:
+		/* For 200MHz clock, 8 Taps are available */
+		tap_max = 8;
+	default:
+		break;
+	}
+
+	tap_delay = (degrees * tap_max) / 360;
+
+	/* Set the Clock Phase */
+	ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
+			      PM_TAPDELAY_OUTPUT, tap_delay, NULL);
+	if (ret)
+		pr_err("Error setting Output Tap Delay\n");
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_sdcardclk_ops = {
+	.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
+	.set_phase = sdhci_zynqmp_sdcardclk_set_phase,
+};
+
+/**
+ * sdhci_zynqmp_sampleclk_set_phase - Set the SD Input Clock Tap Delays
+ *
+ * Set the SD Input Clock Tap Delays for Input path
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @degrees		The clock phase shift between 0 - 359.
+ * Return: 0 on success and error value on error
+ */
+static int sdhci_zynqmp_sampleclk_set_phase(struct clk_hw *hw, int degrees)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+	struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
+		clk_data->clk_of_data;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 node_id = !strcmp(clk_name, "clk_in_sd0") ? NODE_SD_0 : NODE_SD_1;
+	u8 tap_delay, tap_max = 0;
+	int ret;
+
+	/*
+	 * This is applicable for SDHCI_SPEC_300 and above
+	 * ZynqMP does not set phase for <=25MHz clock.
+	 * If degrees is zero, no need to do anything.
+	 */
+	if (host->version < SDHCI_SPEC_300 ||
+	    host->timing == MMC_TIMING_LEGACY ||
+	    host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
+		return 0;
+
+	switch (host->timing) {
+	case MMC_TIMING_MMC_HS:
+	case MMC_TIMING_SD_HS:
+	case MMC_TIMING_UHS_SDR25:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		/* For 50MHz clock, 120 Taps are available */
+		tap_max = 120;
+		break;
+	case MMC_TIMING_UHS_SDR50:
+		/* For 100MHz clock, 60 Taps are available */
+		tap_max = 60;
+		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_MMC_HS200:
+		/* For 200MHz clock, 30 Taps are available */
+		tap_max = 30;
+	default:
+		break;
+	}
+
+	tap_delay = (degrees * tap_max) / 360;
+
+	/* Set the Clock Phase */
+	ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
+			      PM_TAPDELAY_INPUT, tap_delay, NULL);
+	if (ret)
+		pr_err("Error setting Input Tap Delay\n");
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_sampleclk_ops = {
+	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
+	.set_phase = sdhci_zynqmp_sampleclk_set_phase,
+};
+
 /**
  * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
  *
@@ -708,6 +867,10 @@ static void arasan_dt_read_clk_phase(struct device *dev,
 static void arasan_dt_parse_clk_phases(struct device *dev,
 				       struct sdhci_arasan_clk_data *clk_data)
 {
+	int *iclk_phase, *oclk_phase;
+	u32 mio_bank = 0;
+	int i;
+
 	/*
 	 * This has been kept as a pointer and is assigned a function here.
 	 * So that different controller variants can assign their own handling
@@ -715,6 +878,22 @@ static void arasan_dt_parse_clk_phases(struct device *dev,
 	 */
 	clk_data->set_clk_delays = sdhci_arasan_set_clk_delays;
 
+	if (of_device_is_compatible(dev->of_node, "xlnx,zynqmp-8.9a")) {
+		iclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_ICLK_PHASE;
+		oclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_OCLK_PHASE;
+
+		of_property_read_u32(dev->of_node, "xlnx,mio-bank", &mio_bank);
+		if (mio_bank == 2) {
+			oclk_phase[MMC_TIMING_UHS_SDR104] = 90;
+			oclk_phase[MMC_TIMING_MMC_HS200] = 90;
+		}
+
+		for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
+			clk_data->clk_phase_in[i] = iclk_phase[i];
+			clk_data->clk_phase_out[i] = oclk_phase[i];
+		}
+	}
+
 	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
 				 "arasan-clk-phase-legacy");
 	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
@@ -773,7 +952,10 @@ sdhci_arasan_register_sdcardclk(struct sdhci_arasan_data *sdhci_arasan,
 	sdcardclk_init.parent_names = &parent_clk_name;
 	sdcardclk_init.num_parents = 1;
 	sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
-	sdcardclk_init.ops = &arasan_sdcardclk_ops;
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
+		sdcardclk_init.ops = &zynqmp_sdcardclk_ops;
+	else
+		sdcardclk_init.ops = &arasan_sdcardclk_ops;
 
 	clk_data->sdcardclk_hw.init = &sdcardclk_init;
 	clk_data->sdcardclk =
@@ -822,7 +1004,10 @@ sdhci_arasan_register_sampleclk(struct sdhci_arasan_data *sdhci_arasan,
 	sampleclk_init.parent_names = &parent_clk_name;
 	sampleclk_init.num_parents = 1;
 	sampleclk_init.flags = CLK_GET_RATE_NOCACHE;
-	sampleclk_init.ops = &arasan_sampleclk_ops;
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
+		sampleclk_init.ops = &zynqmp_sampleclk_ops;
+	else
+		sampleclk_init.ops = &arasan_sampleclk_ops;
 
 	clk_data->sampleclk_hw.init = &sampleclk_init;
 	clk_data->sampleclk =
@@ -1031,6 +1216,23 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_disable_all;
 
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a")) {
+		struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data;
+		const struct zynqmp_eemi_ops *eemi_ops;
+
+		zynqmp_clk_data = devm_kzalloc(&pdev->dev,
+					       sizeof(*zynqmp_clk_data),
+					       GFP_KERNEL);
+		eemi_ops = zynqmp_pm_get_eemi_ops();
+		if (IS_ERR(eemi_ops)) {
+			ret = PTR_ERR(eemi_ops);
+			goto unreg_clk;
+		}
+
+		zynqmp_clk_data->eemi_ops = eemi_ops;
+		sdhci_arasan->clk_data.clk_of_data = zynqmp_clk_data;
+	}
+
 	arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);
 
 	ret = mmc_of_parse(host->mmc);
-- 
2.17.1

[PATCH v4 8/8] mmc: sdhci-of-arasan: Add support for ZynqMP Platform Tap Delays Setup

[Manish Narani]

Apart from taps set by auto tuning, ZynqMP platform has feature to set
the tap values manually. Add support to set tap delay values in HW via
ZynqMP SoC framework.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 206 ++++++++++++++++++++++++++++-
 1 file changed, 204 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 18eb6cffd269..f488c8bb2be3 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -22,6 +22,7 @@
 #include <linux/phy/phy.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
+#include <linux/firmware/xlnx-zynqmp.h>
 
 #include "cqhci.h"
 #include "sdhci-pltfm.h"
@@ -32,6 +33,10 @@
 
 #define PHY_CLK_TOO_SLOW_HZ		400000
 
+/* Default settings for ZynqMP Clock Phases */
+#define ZYNQMP_ICLK_PHASE {0, 63, 63, 0, 63,  0,   0, 183, 54,  0, 0}
+#define ZYNQMP_OCLK_PHASE {0, 72, 60, 0, 60, 72, 135, 48, 72, 135, 0}
+
 /*
  * On some SoCs the syscon area has a feature where the upper 16-bits of
  * each 32-bit register act as a write mask for the lower 16-bits.  This allows
@@ -80,6 +85,7 @@ struct sdhci_arasan_soc_ctl_map {
  * @clk_phase_in:	Array of Input Clock Phase Delays for all speed modes
  * @clk_phase_out:	Array of Output Clock Phase Delays for all speed modes
  * @set_clk_delays:	Function pointer for setting Clock Delays
+ * @clk_of_data:	Platform specific runtime clock data storage pointer
  */
 struct sdhci_arasan_clk_data {
 	struct clk_hw	sdcardclk_hw;
@@ -89,6 +95,11 @@ struct sdhci_arasan_clk_data {
 	int		clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
 	int		clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
 	void		(*set_clk_delays)(struct sdhci_host *host);
+	void		*clk_of_data;
+};
+
+struct sdhci_arasan_zynqmp_clk_data {
+	const struct zynqmp_eemi_ops *eemi_ops;
 };
 
 /**
@@ -525,6 +536,10 @@ static const struct of_device_id sdhci_arasan_of_match[] = {
 		.compatible = "arasan,sdhci-4.9a",
 		.data = &sdhci_arasan_data,
 	},
+	{
+		.compatible = "xlnx,zynqmp-8.9a",
+		.data = &sdhci_arasan_data,
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
@@ -583,6 +598,150 @@ static const struct clk_ops arasan_sampleclk_ops = {
 	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
 };
 
+/**
+ * sdhci_zynqmp_sdcardclk_set_phase - Set the SD Output Clock Tap Delays
+ *
+ * Set the SD Output Clock Tap Delays for Output path
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @degrees		The clock phase shift between 0 - 359.
+ * Return: 0 on success and error value on error
+ */
+static int sdhci_zynqmp_sdcardclk_set_phase(struct clk_hw *hw, int degrees)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+	struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
+		clk_data->clk_of_data;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 node_id = !strcmp(clk_name, "clk_out_sd0") ? NODE_SD_0 : NODE_SD_1;
+	u8 tap_delay, tap_max = 0;
+	int ret;
+
+	/*
+	 * This is applicable for SDHCI_SPEC_300 and above
+	 * ZynqMP does not set phase for <=25MHz clock.
+	 * If degrees is zero, no need to do anything.
+	 */
+	if (host->version < SDHCI_SPEC_300 ||
+	    host->timing == MMC_TIMING_LEGACY ||
+	    host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
+		return 0;
+
+	switch (host->timing) {
+	case MMC_TIMING_MMC_HS:
+	case MMC_TIMING_SD_HS:
+	case MMC_TIMING_UHS_SDR25:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		/* For 50MHz clock, 30 Taps are available */
+		tap_max = 30;
+		break;
+	case MMC_TIMING_UHS_SDR50:
+		/* For 100MHz clock, 15 Taps are available */
+		tap_max = 15;
+		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_MMC_HS200:
+		/* For 200MHz clock, 8 Taps are available */
+		tap_max = 8;
+	default:
+		break;
+	}
+
+	tap_delay = (degrees * tap_max) / 360;
+
+	/* Set the Clock Phase */
+	ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
+			      PM_TAPDELAY_OUTPUT, tap_delay, NULL);
+	if (ret)
+		pr_err("Error setting Output Tap Delay\n");
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_sdcardclk_ops = {
+	.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
+	.set_phase = sdhci_zynqmp_sdcardclk_set_phase,
+};
+
+/**
+ * sdhci_zynqmp_sampleclk_set_phase - Set the SD Input Clock Tap Delays
+ *
+ * Set the SD Input Clock Tap Delays for Input path
+ *
+ * @hw:			Pointer to the hardware clock structure.
+ * @degrees		The clock phase shift between 0 - 359.
+ * Return: 0 on success and error value on error
+ */
+static int sdhci_zynqmp_sampleclk_set_phase(struct clk_hw *hw, int degrees)
+
+{
+	struct sdhci_arasan_clk_data *clk_data =
+		container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
+	struct sdhci_arasan_data *sdhci_arasan =
+		container_of(clk_data, struct sdhci_arasan_data, clk_data);
+	struct sdhci_host *host = sdhci_arasan->host;
+	struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
+		clk_data->clk_of_data;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 node_id = !strcmp(clk_name, "clk_in_sd0") ? NODE_SD_0 : NODE_SD_1;
+	u8 tap_delay, tap_max = 0;
+	int ret;
+
+	/*
+	 * This is applicable for SDHCI_SPEC_300 and above
+	 * ZynqMP does not set phase for <=25MHz clock.
+	 * If degrees is zero, no need to do anything.
+	 */
+	if (host->version < SDHCI_SPEC_300 ||
+	    host->timing == MMC_TIMING_LEGACY ||
+	    host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
+		return 0;
+
+	switch (host->timing) {
+	case MMC_TIMING_MMC_HS:
+	case MMC_TIMING_SD_HS:
+	case MMC_TIMING_UHS_SDR25:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		/* For 50MHz clock, 120 Taps are available */
+		tap_max = 120;
+		break;
+	case MMC_TIMING_UHS_SDR50:
+		/* For 100MHz clock, 60 Taps are available */
+		tap_max = 60;
+		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_MMC_HS200:
+		/* For 200MHz clock, 30 Taps are available */
+		tap_max = 30;
+	default:
+		break;
+	}
+
+	tap_delay = (degrees * tap_max) / 360;
+
+	/* Set the Clock Phase */
+	ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
+			      PM_TAPDELAY_INPUT, tap_delay, NULL);
+	if (ret)
+		pr_err("Error setting Input Tap Delay\n");
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_sampleclk_ops = {
+	.recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
+	.set_phase = sdhci_zynqmp_sampleclk_set_phase,
+};
+
 /**
  * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
  *
@@ -708,6 +867,10 @@ static void arasan_dt_read_clk_phase(struct device *dev,
 static void arasan_dt_parse_clk_phases(struct device *dev,
 				       struct sdhci_arasan_clk_data *clk_data)
 {
+	int *iclk_phase, *oclk_phase;
+	u32 mio_bank = 0;
+	int i;
+
 	/*
 	 * This has been kept as a pointer and is assigned a function here.
 	 * So that different controller variants can assign their own handling
@@ -715,6 +878,22 @@ static void arasan_dt_parse_clk_phases(struct device *dev,
 	 */
 	clk_data->set_clk_delays = sdhci_arasan_set_clk_delays;
 
+	if (of_device_is_compatible(dev->of_node, "xlnx,zynqmp-8.9a")) {
+		iclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_ICLK_PHASE;
+		oclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_OCLK_PHASE;
+
+		of_property_read_u32(dev->of_node, "xlnx,mio-bank", &mio_bank);
+		if (mio_bank == 2) {
+			oclk_phase[MMC_TIMING_UHS_SDR104] = 90;
+			oclk_phase[MMC_TIMING_MMC_HS200] = 90;
+		}
+
+		for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
+			clk_data->clk_phase_in[i] = iclk_phase[i];
+			clk_data->clk_phase_out[i] = oclk_phase[i];
+		}
+	}
+
 	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
 				 "arasan-clk-phase-legacy");
 	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
@@ -773,7 +952,10 @@ sdhci_arasan_register_sdcardclk(struct sdhci_arasan_data *sdhci_arasan,
 	sdcardclk_init.parent_names = &parent_clk_name;
 	sdcardclk_init.num_parents = 1;
 	sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
-	sdcardclk_init.ops = &arasan_sdcardclk_ops;
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
+		sdcardclk_init.ops = &zynqmp_sdcardclk_ops;
+	else
+		sdcardclk_init.ops = &arasan_sdcardclk_ops;
 
 	clk_data->sdcardclk_hw.init = &sdcardclk_init;
 	clk_data->sdcardclk =
@@ -822,7 +1004,10 @@ sdhci_arasan_register_sampleclk(struct sdhci_arasan_data *sdhci_arasan,
 	sampleclk_init.parent_names = &parent_clk_name;
 	sampleclk_init.num_parents = 1;
 	sampleclk_init.flags = CLK_GET_RATE_NOCACHE;
-	sampleclk_init.ops = &arasan_sampleclk_ops;
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
+		sampleclk_init.ops = &zynqmp_sampleclk_ops;
+	else
+		sampleclk_init.ops = &arasan_sampleclk_ops;
 
 	clk_data->sampleclk_hw.init = &sampleclk_init;
 	clk_data->sampleclk =
@@ -1031,6 +1216,23 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_disable_all;
 
+	if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a")) {
+		struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data;
+		const struct zynqmp_eemi_ops *eemi_ops;
+
+		zynqmp_clk_data = devm_kzalloc(&pdev->dev,
+					       sizeof(*zynqmp_clk_data),
+					       GFP_KERNEL);
+		eemi_ops = zynqmp_pm_get_eemi_ops();
+		if (IS_ERR(eemi_ops)) {
+			ret = PTR_ERR(eemi_ops);
+			goto unreg_clk;
+		}
+
+		zynqmp_clk_data->eemi_ops = eemi_ops;
+		sdhci_arasan->clk_data.clk_of_data = zynqmp_clk_data;
+	}
+
 	arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);
 
 	ret = mmc_of_parse(host->mmc);
-- 
2.17.1


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Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Rob Herring]

On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> Add documentation for an optional input clock which is essentially used
> in sampling the input data coming from the card.
> 
> Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> ---
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Please add Acked-by/Reviewed-by tags when posting new versions. However,
there's no need to repost patches *only* to add the tags. The upstream
maintainer will do that for acks received on the version they apply.

If a tag was not added on purpose, please state why and what changed.

Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Rob Herring]

On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> Add documentation for an optional input clock which is essentially used
> in sampling the input data coming from the card.
> 
> Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> ---
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Please add Acked-by/Reviewed-by tags when posting new versions. However,
there's no need to repost patches *only* to add the tags. The upstream
maintainer will do that for acks received on the version they apply.

If a tag was not added on purpose, please state why and what changed.

Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Rob Herring]

On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> Add documentation for an optional input clock which is essentially used
> in sampling the input data coming from the card.
> 
> Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> ---
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Please add Acked-by/Reviewed-by tags when posting new versions. However,
there's no need to repost patches *only* to add the tags. The upstream
maintainer will do that for acks received on the version they apply.

If a tag was not added on purpose, please state why and what changed.

_______________________________________________
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Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Ulf Hansson]

On Tue, 29 Oct 2019 at 11:30, Manish Narani <manish.narani@xilinx.com> wrote:
>
> Add optional properties for Arasan SDHCI which are used to set clk delays
> for different speed modes in the controller.
>
> Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> ---
>  .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index b51e40b2e0c5..c0f505b6cab5 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -46,6 +46,22 @@ Optional Properties:
>      properly. Test mode can be used to force the controller to function.
>    - xlnx,int-clock-stable-broken: when present, the controller always reports
>      that the internal clock is stable even when it is not.
> +  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
> +  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
> +  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
> +  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
> +  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
> +  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
> +  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
> +  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
> +  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
> +  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
> +  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.

I don't mind if you convert these to common mmc bindings.

I think other controllers/platforms may find them useful, at least at
some point, if not already.

> +
> +  Above mentioned are the clock (phase) delays which are to be configured in the
> +  controller while switching to particular speed mode. The range of values are
> +  0 to 359 degrees. If not specified, driver will configure the default value
> +  defined for particular mode in it.
>
>  Example:
>         sdhci@e0100000 {
> --
> 2.17.1
>

Kind regards
Uffe

Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Ulf Hansson]

On Tue, 29 Oct 2019 at 11:30, Manish Narani <manish.narani@xilinx.com> wrote:
>
> Add optional properties for Arasan SDHCI which are used to set clk delays
> for different speed modes in the controller.
>
> Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> ---
>  .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index b51e40b2e0c5..c0f505b6cab5 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -46,6 +46,22 @@ Optional Properties:
>      properly. Test mode can be used to force the controller to function.
>    - xlnx,int-clock-stable-broken: when present, the controller always reports
>      that the internal clock is stable even when it is not.
> +  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for Legacy Mode.
> +  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for MMC HS.
> +  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD HS.
> +  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees for SDR12.
> +  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees for SDR25.
> +  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees for SDR50.
> +  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees for SDR104.
> +  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees for SD DDR50.
> +  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees for MMC DDR52.
> +  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees for MMC HS200.
> +  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees for MMC HS400.

I don't mind if you convert these to common mmc bindings.

I think other controllers/platforms may find them useful, at least at
some point, if not already.

> +
> +  Above mentioned are the clock (phase) delays which are to be configured in the
> +  controller while switching to particular speed mode. The range of values are
> +  0 to 359 degrees. If not specified, driver will configure the default value
> +  defined for particular mode in it.
>
>  Example:
>         sdhci@e0100000 {
> --
> 2.17.1
>

Kind regards
Uffe

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

RE: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Manish Narani]

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: Wednesday, October 30, 2019 12:10 AM
> To: Manish Narani <MNARANI@xilinx.com>
> Cc: ulf.hansson@linaro.org; robh+dt@kernel.org; mark.rutland@arm.com;
> adrian.hunter@intel.com; Michal Simek <michals@xilinx.com>; Jolly Shah
> <JOLLYS@xilinx.com>; Nava kishore Manne <navam@xilinx.com>; Rajan Vaja
> <RAJANV@xilinx.com>; Manish Narani <MNARANI@xilinx.com>; linux-
> mmc@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; git
> <git@xilinx.com>
> Subject: Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update
> Documentation for the input clock
> 
> On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> > Add documentation for an optional input clock which is essentially used
> > in sampling the input data coming from the card.
> >
> > Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> > ---
> >  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> 
> Please add Acked-by/Reviewed-by tags when posting new versions.
> However,
> there's no need to repost patches *only* to add the tags. The upstream
> maintainer will do that for acks received on the version they apply.
> 
> If a tag was not added on purpose, please state why and what changed.

That was mistakenly not added. My apologies.
However, Uffe has some comments on this version, so will send out v5 with addressing them and will include the 'reviewed-by' tag.

Thanks,
Manish

RE: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Manish Narani]

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: Wednesday, October 30, 2019 12:10 AM
> To: Manish Narani <MNARANI@xilinx.com>
> Cc: ulf.hansson@linaro.org; robh+dt@kernel.org; mark.rutland@arm.com;
> adrian.hunter@intel.com; Michal Simek <michals@xilinx.com>; Jolly Shah
> <JOLLYS@xilinx.com>; Nava kishore Manne <navam@xilinx.com>; Rajan Vaja
> <RAJANV@xilinx.com>; Manish Narani <MNARANI@xilinx.com>; linux-
> mmc@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; git
> <git@xilinx.com>
> Subject: Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update
> Documentation for the input clock
> 
> On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> > Add documentation for an optional input clock which is essentially used
> > in sampling the input data coming from the card.
> >
> > Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> > ---
> >  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> 
> Please add Acked-by/Reviewed-by tags when posting new versions.
> However,
> there's no need to repost patches *only* to add the tags. The upstream
> maintainer will do that for acks received on the version they apply.
> 
> If a tag was not added on purpose, please state why and what changed.

That was mistakenly not added. My apologies.
However, Uffe has some comments on this version, so will send out v5 with addressing them and will include the 'reviewed-by' tag.

Thanks,
Manish

RE: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update Documentation for the input clock

[Manish Narani]

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: Wednesday, October 30, 2019 12:10 AM
> To: Manish Narani <MNARANI@xilinx.com>
> Cc: ulf.hansson@linaro.org; robh+dt@kernel.org; mark.rutland@arm.com;
> adrian.hunter@intel.com; Michal Simek <michals@xilinx.com>; Jolly Shah
> <JOLLYS@xilinx.com>; Nava kishore Manne <navam@xilinx.com>; Rajan Vaja
> <RAJANV@xilinx.com>; Manish Narani <MNARANI@xilinx.com>; linux-
> mmc@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; git
> <git@xilinx.com>
> Subject: Re: [PATCH v4 2/8] dt-bindings: mmc: arasan: Update
> Documentation for the input clock
> 
> On Tue, 29 Oct 2019 16:00:36 +0530, Manish Narani wrote:
> > Add documentation for an optional input clock which is essentially used
> > in sampling the input data coming from the card.
> >
> > Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> > ---
> >  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> 
> Please add Acked-by/Reviewed-by tags when posting new versions.
> However,
> there's no need to repost patches *only* to add the tags. The upstream
> maintainer will do that for acks received on the version they apply.
> 
> If a tag was not added on purpose, please state why and what changed.

That was mistakenly not added. My apologies.
However, Uffe has some comments on this version, so will send out v5 with addressing them and will include the 'reviewed-by' tag.

Thanks,
Manish

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

RE: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Manish Narani]

Hi Uffe,

Thanks for your comments. Please see below inline.

> -----Original Message-----
> From: Ulf Hansson <ulf.hansson@linaro.org>
> Sent: Wednesday, October 30, 2019 8:27 PM
> To: Manish Narani <MNARANI@xilinx.com>
> Cc: Rob Herring <robh+dt@kernel.org>; Mark Rutland
> <mark.rutland@arm.com>; Adrian Hunter <adrian.hunter@intel.com>;
> Michal Simek <michals@xilinx.com>; Jolly Shah <JOLLYS@xilinx.com>; Nava
> kishore Manne <navam@xilinx.com>; Rajan Vaja <RAJANV@xilinx.com>;
> linux-mmc@vger.kernel.org; DTML <devicetree@vger.kernel.org>; Linux
> Kernel Mailing List <linux-kernel@vger.kernel.org>; Linux ARM <linux-arm-
> kernel@lists.infradead.org>; git <git@xilinx.com>
> Subject: Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional
> properties for Arasan SDHCI
> 
> On Tue, 29 Oct 2019 at 11:30, Manish Narani <manish.narani@xilinx.com>
> wrote:
> >
> > Add optional properties for Arasan SDHCI which are used to set clk delays
> > for different speed modes in the controller.
> >
> > Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> > ---
> >  .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > index b51e40b2e0c5..c0f505b6cab5 100644
> > --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > @@ -46,6 +46,22 @@ Optional Properties:
> >      properly. Test mode can be used to force the controller to function.
> >    - xlnx,int-clock-stable-broken: when present, the controller always
> reports
> >      that the internal clock is stable even when it is not.
> > +  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for
> Legacy Mode.
> > +  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for
> MMC HS.
> > +  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD
> HS.
> > +  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees
> for SDR12.
> > +  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees
> for SDR25.
> > +  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees
> for SDR50.
> > +  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees
> for SDR104.
> > +  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees
> for SD DDR50.
> > +  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees
> for MMC DDR52.
> > +  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees
> for MMC HS200.
> > +  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees
> for MMC HS400.
> 
> I don't mind if you convert these to common mmc bindings.
> 
> I think other controllers/platforms may find them useful, at least at
> some point, if not already.

That will be a good thing to do indeed. Will send v5 with making these properties as common.

Thanks,
Manish

> 
> > +
> > +  Above mentioned are the clock (phase) delays which are to be
> configured in the
> > +  controller while switching to particular speed mode. The range of values
> are
> > +  0 to 359 degrees. If not specified, driver will configure the default value
> > +  defined for particular mode in it.
> >
> >  Example:
> >         sdhci@e0100000 {
> > --
> > 2.17.1
> >
> 
> Kind regards
> Uffe

RE: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional properties for Arasan SDHCI

[Manish Narani]

Hi Uffe,

Thanks for your comments. Please see below inline.

> -----Original Message-----
> From: Ulf Hansson <ulf.hansson@linaro.org>
> Sent: Wednesday, October 30, 2019 8:27 PM
> To: Manish Narani <MNARANI@xilinx.com>
> Cc: Rob Herring <robh+dt@kernel.org>; Mark Rutland
> <mark.rutland@arm.com>; Adrian Hunter <adrian.hunter@intel.com>;
> Michal Simek <michals@xilinx.com>; Jolly Shah <JOLLYS@xilinx.com>; Nava
> kishore Manne <navam@xilinx.com>; Rajan Vaja <RAJANV@xilinx.com>;
> linux-mmc@vger.kernel.org; DTML <devicetree@vger.kernel.org>; Linux
> Kernel Mailing List <linux-kernel@vger.kernel.org>; Linux ARM <linux-arm-
> kernel@lists.infradead.org>; git <git@xilinx.com>
> Subject: Re: [PATCH v4 4/8] dt-bindings: mmc: arasan: Add optional
> properties for Arasan SDHCI
> 
> On Tue, 29 Oct 2019 at 11:30, Manish Narani <manish.narani@xilinx.com>
> wrote:
> >
> > Add optional properties for Arasan SDHCI which are used to set clk delays
> > for different speed modes in the controller.
> >
> > Signed-off-by: Manish Narani <manish.narani@xilinx.com>
> > ---
> >  .../devicetree/bindings/mmc/arasan,sdhci.txt     | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > index b51e40b2e0c5..c0f505b6cab5 100644
> > --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> > @@ -46,6 +46,22 @@ Optional Properties:
> >      properly. Test mode can be used to force the controller to function.
> >    - xlnx,int-clock-stable-broken: when present, the controller always
> reports
> >      that the internal clock is stable even when it is not.
> > +  - arasan-clk-phase-legacy: Input/Output Clock Delay pair in degrees for
> Legacy Mode.
> > +  - arasan-clk-phase-mmc-hs: Input/Output Clock Delay pair degrees for
> MMC HS.
> > +  - arasan-clk-phase-sd-hs: Input/Output Clock Delay pair in degrees for SD
> HS.
> > +  - arasan-clk-phase-uhs-sdr12: Input/Output Clock Delay pair in degrees
> for SDR12.
> > +  - arasan-clk-phase-uhs-sdr25: Input/Output Clock Delay pair in degrees
> for SDR25.
> > +  - arasan-clk-phase-uhs-sdr50: Input/Output Clock Delay pair in degrees
> for SDR50.
> > +  - arasan-clk-phase-uhs-sdr104: Input/Output Clock Delay pair in degrees
> for SDR104.
> > +  - arasan-clk-phase-uhs-ddr50: Input/Output Clock Delay pair in degrees
> for SD DDR50.
> > +  - arasan-clk-phase-mmc-ddr52: Input/Output Clock Delay pair in degrees
> for MMC DDR52.
> > +  - arasan-clk-phase-mmc-hs200: Input/Output Clock Delay pair in degrees
> for MMC HS200.
> > +  - arasan-clk-phase-mmc-hs400: Input/Output Clock Delay pair in degrees
> for MMC HS400.
> 
> I don't mind if you convert these to common mmc bindings.
> 
> I think other controllers/platforms may find them useful, at least at
> some point, if not already.

That will be a good thing to do indeed. Will send v5 with making these properties as common.

Thanks,
Manish

> 
> > +
> > +  Above mentioned are the clock (phase) delays which are to be
> configured in the
> > +  controller while switching to particular speed mode. The range of values
> are
> > +  0 to 359 degrees. If not specified, driver will configure the default value
> > +  defined for particular mode in it.
> >
> >  Example:
> >         sdhci@e0100000 {
> > --
> > 2.17.1
> >
> 
> Kind regards
> Uffe
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