[PATCH v10 0/2] phy: intel-lgm-emmc: Add support for eMMC PHY

[PATCH v10 0/2] phy: intel-lgm-emmc: Add support for eMMC PHY

[Ramuthevar,Vadivel MuruganX]

Add eMMC-PHY support for Intel LGM SoC

changes in v10:
  - Rob's review comments update in YAML
  - drop clock-names since it is single entry
 
changes in v9:
  - Rob's review comments update in YAML

changes in v8:
 Remove the extra Signed-of-by

changes in v7:
 Rebased to maintainer kernel tree phy-tag-5.5

changes in v6:
   - cobined comaptible strings
   - added as contiguous and can be a single entry for reg properties
changes in v5:
   - earlier Review-by tag given by Rob
   - rework done with syscon parent node.

 changes in v4:
   - As per Rob's review: validate 5.2 and 5.3
   - drop unrelated items.

 changes in v3:
   - resolve 'make dt_binding_check' warnings

 changes in v2:
   As per Rob Herring review comments, the following updates
  - change GPL-2.0 -> (GPL-2.0-only OR BSD-2-Clause)
  - filename is the compatible string plus .yaml
  - LGM: Lightning Mountain
  - update maintainer
  - add intel,syscon under property list
  - keep one example instead of two



Ramuthevar Vadivel Murugan (2):
  dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY
  phy: intel-lgm-emmc: Add support for eMMC PHY

 .../bindings/phy/intel,lgm-emmc-phy.yaml           |  56 ++++
 drivers/phy/Kconfig                                |   1 +
 drivers/phy/Makefile                               |   1 +
 drivers/phy/intel/Kconfig                          |   9 +
 drivers/phy/intel/Makefile                         |   2 +
 drivers/phy/intel/phy-intel-emmc.c                 | 283 +++++++++++++++++++++
 6 files changed, 352 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
 create mode 100644 drivers/phy/intel/Kconfig
 create mode 100644 drivers/phy/intel/Makefile
 create mode 100644 drivers/phy/intel/phy-intel-emmc.c

-- 
2.11.0

[PATCH v10 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY

[Ramuthevar,Vadivel MuruganX]

From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

Add a YAML schema to use the host controller driver with the
eMMC PHY on Intel's Lightning Mountain SoC.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
---
 .../bindings/phy/intel,lgm-emmc-phy.yaml           | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
new file mode 100644
index 000000000000..ff7959c21af0
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/intel,lgm-emmc-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intel Lightning Mountain(LGM) eMMC PHY Device Tree Bindings
+
+maintainers:
+  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
+
+description: |+
+  Bindings for eMMC PHY on Intel's Lightning Mountain SoC, syscon
+  node is used to reference the base address of eMMC phy registers.
+
+  The eMMC PHY node should be the child of a syscon node with the
+  required property:
+
+  - compatible:         Should be one of the following:
+                        "intel,lgm-syscon", "syscon"
+  - reg:
+      maxItems: 1
+
+properties:
+  compatible:
+      const: intel,lgm-emmc-phy
+
+  "#phy-cells":
+    const: 0
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - "#phy-cells"
+  - compatible
+  - reg
+  - clocks
+
+examples:
+  - |
+    sysconf: chiptop@e0200000 {
+      compatible = "intel,lgm-syscon", "syscon";
+      reg = <0xe0200000 0x100>;
+
+      emmc-phy: emmc-phy@a8 {
+        compatible = "intel,lgm-emmc-phy";
+        reg = <0x00a8 0x10>;
+        clocks = <&emmc>;
+        #phy-cells = <0>;
+      };
+    };
+...
-- 
2.11.0

Re: [PATCH v10 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY

[Rob Herring]

On Tue, 17 Dec 2019 09:56:57 +0800, "Ramuthevar,Vadivel MuruganX"          wrote:
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
> 
> Add a YAML schema to use the host controller driver with the
> eMMC PHY on Intel's Lightning Mountain SoC.
> 
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
> ---
>  .../bindings/phy/intel,lgm-emmc-phy.yaml           | 56 ++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> 

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

Re: [PATCH v10 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY

[Rob Herring]

On Mon, Dec 16, 2019 at 7:57 PM Ramuthevar,Vadivel MuruganX
<vadivel.muruganx.ramuthevar@linux.intel.com> wrote:
>
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>
> Add a YAML schema to use the host controller driver with the
> eMMC PHY on Intel's Lightning Mountain SoC.
>
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
> ---
>  .../bindings/phy/intel,lgm-emmc-phy.yaml           | 56 ++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>
> diff --git a/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> new file mode 100644
> index 000000000000..ff7959c21af0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/intel,lgm-emmc-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Intel Lightning Mountain(LGM) eMMC PHY Device Tree Bindings
> +
> +maintainers:
> +  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
> +
> +description: |+
> +  Bindings for eMMC PHY on Intel's Lightning Mountain SoC, syscon
> +  node is used to reference the base address of eMMC phy registers.
> +
> +  The eMMC PHY node should be the child of a syscon node with the
> +  required property:
> +
> +  - compatible:         Should be one of the following:
> +                        "intel,lgm-syscon", "syscon"
> +  - reg:
> +      maxItems: 1
> +
> +properties:
> +  compatible:
> +      const: intel,lgm-emmc-phy
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - "#phy-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +
> +examples:
> +  - |
> +    sysconf: chiptop@e0200000 {
> +      compatible = "intel,lgm-syscon", "syscon";
> +      reg = <0xe0200000 0x100>;
> +
> +      emmc-phy: emmc-phy@a8 {

This fails in linux-next. Please run 'make dt_binding_check' and fix:

Error: Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.example.dts:21.19-20
syntax error
FATAL ERROR: Unable to parse input tree

The problem is labels can't have '-'.

Rob

Re: [PATCH v10 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY

[Ramuthevar, Vadivel MuruganX]

Hi,

On 14/1/2020 1:55 AM, Rob Herring wrote:
> On Mon, Dec 16, 2019 at 7:57 PM Ramuthevar,Vadivel MuruganX
> <vadivel.muruganx.ramuthevar@linux.intel.com> wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>>
>> Add a YAML schema to use the host controller driver with the
>> eMMC PHY on Intel's Lightning Mountain SoC.
>>
>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>> ---
>>   .../bindings/phy/intel,lgm-emmc-phy.yaml           | 56 ++++++++++++++++++++++
>>   1 file changed, 56 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>> new file mode 100644
>> index 000000000000..ff7959c21af0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>> @@ -0,0 +1,56 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/intel,lgm-emmc-phy.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Intel Lightning Mountain(LGM) eMMC PHY Device Tree Bindings
>> +
>> +maintainers:
>> +  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>> +
>> +description: |+
>> +  Bindings for eMMC PHY on Intel's Lightning Mountain SoC, syscon
>> +  node is used to reference the base address of eMMC phy registers.
>> +
>> +  The eMMC PHY node should be the child of a syscon node with the
>> +  required property:
>> +
>> +  - compatible:         Should be one of the following:
>> +                        "intel,lgm-syscon", "syscon"
>> +  - reg:
>> +      maxItems: 1
>> +
>> +properties:
>> +  compatible:
>> +      const: intel,lgm-emmc-phy
>> +
>> +  "#phy-cells":
>> +    const: 0
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +required:
>> +  - "#phy-cells"
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +
>> +examples:
>> +  - |
>> +    sysconf: chiptop@e0200000 {
>> +      compatible = "intel,lgm-syscon", "syscon";
>> +      reg = <0xe0200000 0x100>;
>> +
>> +      emmc-phy: emmc-phy@a8 {
> This fails in linux-next. Please run 'make dt_binding_check' and fix:
>
> Error: Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.example.dts:21.19-20
> syntax error
> FATAL ERROR: Unable to parse input tree
Sorry for the trouble, will fix it .
>
> The problem is labels can't have '-'.
Thanks for the direction.
Regards
vadivel
>
> Rob

[PATCH v10 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY

[Ramuthevar,Vadivel MuruganX]

From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

Add support for eMMC PHY on Intel's Lightning Mountain SoC.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
---
 drivers/phy/Kconfig                |   1 +
 drivers/phy/Makefile               |   1 +
 drivers/phy/intel/Kconfig          |   9 ++
 drivers/phy/intel/Makefile         |   2 +
 drivers/phy/intel/phy-intel-emmc.c | 283 +++++++++++++++++++++++++++++++++++++
 5 files changed, 296 insertions(+)
 create mode 100644 drivers/phy/intel/Kconfig
 create mode 100644 drivers/phy/intel/Makefile
 create mode 100644 drivers/phy/intel/phy-intel-emmc.c

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 0263db2ac874..b3ed94b98d9b 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -69,5 +69,6 @@ source "drivers/phy/socionext/Kconfig"
 source "drivers/phy/st/Kconfig"
 source "drivers/phy/tegra/Kconfig"
 source "drivers/phy/ti/Kconfig"
+source "drivers/phy/intel/Kconfig"
 
 endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index c96a1afc95bd..310c149a9df5 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -18,6 +18,7 @@ obj-y					+= broadcom/	\
 					   cadence/	\
 					   freescale/	\
 					   hisilicon/	\
+					   intel/	\
 					   lantiq/	\
 					   marvell/	\
 					   motorola/	\
diff --git a/drivers/phy/intel/Kconfig b/drivers/phy/intel/Kconfig
new file mode 100644
index 000000000000..4ea6a8897cd7
--- /dev/null
+++ b/drivers/phy/intel/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Phy drivers for Intel Lightning Mountain(LGM) platform
+#
+config PHY_INTEL_EMMC
+	tristate "Intel EMMC PHY driver"
+	select GENERIC_PHY
+	help
+	  Enable this to support the Intel EMMC PHY
diff --git a/drivers/phy/intel/Makefile b/drivers/phy/intel/Makefile
new file mode 100644
index 000000000000..6b876a75599d
--- /dev/null
+++ b/drivers/phy/intel/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PHY_INTEL_EMMC)            += phy-intel-emmc.o
diff --git a/drivers/phy/intel/phy-intel-emmc.c b/drivers/phy/intel/phy-intel-emmc.c
new file mode 100644
index 000000000000..1a358e7fd236
--- /dev/null
+++ b/drivers/phy/intel/phy-intel-emmc.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel eMMC PHY driver
+ * Copyright (C) 2019 Intel, Corp.
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* eMMC phy register definitions */
+#define EMMC_PHYCTRL0_REG	0xa8
+#define DR_TY_MASK		GENMASK(30, 28)
+#define DR_TY_SHIFT(x)		(((x) << 28) & DR_TY_MASK)
+#define OTAPDLYENA		BIT(14)
+#define OTAPDLYSEL_MASK		GENMASK(13, 10)
+#define OTAPDLYSEL_SHIFT(x)	(((x) << 10) & OTAPDLYSEL_MASK)
+
+#define EMMC_PHYCTRL1_REG	0xac
+#define PDB_MASK		BIT(0)
+#define PDB_SHIFT(x)		(((x) << 0) & PDB_MASK)
+#define ENDLL_MASK		BIT(7)
+#define ENDLL_SHIFT(x)		(((x) << 7) & ENDLL_MASK)
+
+#define EMMC_PHYCTRL2_REG	0xb0
+#define FRQSEL_25M		0
+#define FRQSEL_50M		1
+#define FRQSEL_100M		2
+#define FRQSEL_150M		3
+#define FRQSEL_MASK		GENMASK(24, 22)
+#define FRQSEL_SHIFT(x)		(((x) << 22) & FRQSEL_MASK)
+
+#define EMMC_PHYSTAT_REG	0xbc
+#define CALDONE_MASK		BIT(9)
+#define DLLRDY_MASK		BIT(8)
+#define IS_CALDONE(x)	((x) & CALDONE_MASK)
+#define IS_DLLRDY(x)	((x) & DLLRDY_MASK)
+
+struct intel_emmc_phy {
+	struct regmap *syscfg;
+	struct clk *emmcclk;
+};
+
+static int intel_emmc_phy_power(struct phy *phy, bool on_off)
+{
+	struct intel_emmc_phy *priv = phy_get_drvdata(phy);
+	unsigned int caldone;
+	unsigned int dllrdy;
+	unsigned int freqsel;
+	unsigned long rate;
+	int ret, quot;
+
+	/*
+	 * Keep phyctrl_pdb and phyctrl_endll low to allow
+	 * initialization of CALIO state M/C DFFs
+	 */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL1_REG, PDB_MASK,
+				 PDB_SHIFT(0));
+	if (ret) {
+		dev_err(&phy->dev, "CALIO power down bar failed: %d\n", ret);
+		return ret;
+	}
+
+	/* Already finish power_off above */
+	if (!on_off)
+		return 0;
+
+	rate = clk_get_rate(priv->emmcclk);
+	quot = DIV_ROUND_CLOSEST(rate, 50000000);
+	if (quot > FRQSEL_150M)
+		dev_warn(&phy->dev, "Unsupported rate: %lu\n", rate);
+	freqsel = clamp_t(int, quot, FRQSEL_25M, FRQSEL_150M);
+
+	/*
+	 * According to the user manual, calpad calibration
+	 * cycle takes more than 2us without the minimal recommended
+	 * value, so we may need a little margin here
+	 */
+	udelay(5);
+
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL1_REG, PDB_MASK,
+				 PDB_SHIFT(1));
+	if (ret) {
+		dev_err(&phy->dev, "CALIO power down bar failed: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * According to the user manual, it asks driver to wait 5us for
+	 * calpad busy trimming. However it is documented that this value is
+	 * PVT(A.K.A process,voltage and temperature) relevant, so some
+	 * failure cases are found which indicates we should be more tolerant
+	 * to calpad busy trimming.
+	 */
+	ret = regmap_read_poll_timeout(priv->syscfg, EMMC_PHYSTAT_REG,
+				       caldone, IS_CALDONE(caldone),
+				       0, 50);
+	if (ret) {
+		dev_err(&phy->dev, "caldone failed, ret=%d\n", ret);
+		return ret;
+	}
+
+	/* Set the frequency of the DLL operation */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL2_REG, FRQSEL_MASK,
+				 FRQSEL_SHIFT(freqsel));
+	if (ret) {
+		dev_err(&phy->dev, "set the frequency of dll failed:%d\n", ret);
+		return ret;
+	}
+
+	/* Turn on the DLL */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL1_REG, ENDLL_MASK,
+				 ENDLL_SHIFT(1));
+	if (ret) {
+		dev_err(&phy->dev, "turn on the dll failed: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * After enabling analog DLL circuits docs say that we need 10.2 us if
+	 * our source clock is at 50 MHz and that lock time scales linearly
+	 * with clock speed.  If we are powering on the PHY and the card clock
+	 * is super slow (like 100 kHZ) this could take as long as 5.1 ms as
+	 * per the math: 10.2 us * (50000000 Hz / 100000 Hz) => 5.1 ms
+	 * Hopefully we won't be running at 100 kHz, but we should still make
+	 * sure we wait long enough.
+	 *
+	 * NOTE: There appear to be corner cases where the DLL seems to take
+	 * extra long to lock for reasons that aren't understood.  In some
+	 * extreme cases we've seen it take up to over 10ms (!).  We'll be
+	 * generous and give it 50ms.
+	 */
+	ret = regmap_read_poll_timeout(priv->syscfg,
+				       EMMC_PHYSTAT_REG,
+				       dllrdy, IS_DLLRDY(dllrdy),
+				       0, 50 * USEC_PER_MSEC);
+	if (ret) {
+		dev_err(&phy->dev, "dllrdy failed. ret=%d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int intel_emmc_phy_init(struct phy *phy)
+{
+	struct intel_emmc_phy *priv = phy_get_drvdata(phy);
+
+	/*
+	 * We purposely get the clock here and not in probe to avoid the
+	 * circular dependency problem. We expect:
+	 * - PHY driver to probe
+	 * - SDHCI driver to start probe
+	 * - SDHCI driver to register it's clock
+	 * - SDHCI driver to get the PHY
+	 * - SDHCI driver to init the PHY
+	 *
+	 * The clock is optional, so upon any error just return it like
+	 * any other error to user.
+	 *
+	 */
+	priv->emmcclk = clk_get_optional(&phy->dev, "emmcclk");
+	if (IS_ERR(priv->emmcclk)) {
+		dev_err(&phy->dev, "ERROR: getting emmcclk\n");
+		return PTR_ERR(priv->emmcclk);
+	}
+
+	return 0;
+}
+
+static int intel_emmc_phy_exit(struct phy *phy)
+{
+	struct intel_emmc_phy *priv = phy_get_drvdata(phy);
+
+	clk_put(priv->emmcclk);
+
+	return 0;
+}
+
+static int intel_emmc_phy_power_on(struct phy *phy)
+{
+	struct intel_emmc_phy *priv = phy_get_drvdata(phy);
+	int ret;
+
+	/* Drive impedance: 50 Ohm */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, DR_TY_MASK,
+				 DR_TY_SHIFT(6));
+	if (ret) {
+		dev_err(&phy->dev, "ERROR set drive-impednce-50ohm: %d\n", ret);
+		return ret;
+	}
+
+	/* Output tap delay: disable */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, OTAPDLYENA,
+				 0);
+	if (ret) {
+		dev_err(&phy->dev, "ERROR Set output tap delay : %d\n", ret);
+		return ret;
+	}
+
+	/* Output tap delay */
+	ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG,
+				 OTAPDLYSEL_MASK, OTAPDLYSEL_SHIFT(4));
+	if (ret) {
+		dev_err(&phy->dev, "ERROR: output tap dly select: %d\n", ret);
+		return ret;
+	}
+
+	/* Power up eMMC phy analog blocks */
+	return intel_emmc_phy_power(phy, true);
+}
+
+static int intel_emmc_phy_power_off(struct phy *phy)
+{
+	/* Power down eMMC phy analog blocks */
+	return intel_emmc_phy_power(phy, false);
+}
+
+static const struct phy_ops ops = {
+	.init		= intel_emmc_phy_init,
+	.exit		= intel_emmc_phy_exit,
+	.power_on	= intel_emmc_phy_power_on,
+	.power_off	= intel_emmc_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static int intel_emmc_phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct intel_emmc_phy *priv;
+	struct phy *generic_phy;
+	struct phy_provider *phy_provider;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* Get eMMC phy (accessed via chiptop) regmap */
+	priv->syscfg = syscon_regmap_lookup_by_phandle(np, "intel,syscon");
+	if (IS_ERR(priv->syscfg)) {
+		dev_err(dev, "failed to find syscon\n");
+		return PTR_ERR(priv->syscfg);
+	}
+
+	generic_phy = devm_phy_create(dev, np, &ops);
+	if (IS_ERR(generic_phy)) {
+		dev_err(dev, "failed to create PHY\n");
+		return PTR_ERR(generic_phy);
+	}
+
+	phy_set_drvdata(generic_phy, priv);
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id intel_emmc_phy_dt_ids[] = {
+	{ .compatible = "intel,lgm-emmc-phy" },
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, intel_emmc_phy_dt_ids);
+
+static struct platform_driver intel_emmc_driver = {
+	.probe		= intel_emmc_phy_probe,
+	.driver		= {
+		.name	= "intel-emmc-phy",
+		.of_match_table = intel_emmc_phy_dt_ids,
+	},
+};
+
+module_platform_driver(intel_emmc_driver);
+
+MODULE_AUTHOR("Peter Harliman Liem <peter.harliman.liem@intel.com>");
+MODULE_DESCRIPTION("Intel eMMC PHY driver");
-- 
2.11.0

Re: [PATCH v10 0/2] phy: intel-lgm-emmc: Add support for eMMC PHY

[Kishon Vijay Abraham I]

On 17/12/19 7:26 AM, Ramuthevar,Vadivel MuruganX wrote:
> Add eMMC-PHY support for Intel LGM SoC

merged now, Thanks!

-Kishon

> 
> changes in v10:
>   - Rob's review comments update in YAML
>   - drop clock-names since it is single entry
>  
> changes in v9:
>   - Rob's review comments update in YAML
> 
> changes in v8:
>  Remove the extra Signed-of-by
> 
> changes in v7:
>  Rebased to maintainer kernel tree phy-tag-5.5
> 
> changes in v6:
>    - cobined comaptible strings
>    - added as contiguous and can be a single entry for reg properties
> changes in v5:
>    - earlier Review-by tag given by Rob
>    - rework done with syscon parent node.
> 
>  changes in v4:
>    - As per Rob's review: validate 5.2 and 5.3
>    - drop unrelated items.
> 
>  changes in v3:
>    - resolve 'make dt_binding_check' warnings
> 
>  changes in v2:
>    As per Rob Herring review comments, the following updates
>   - change GPL-2.0 -> (GPL-2.0-only OR BSD-2-Clause)
>   - filename is the compatible string plus .yaml
>   - LGM: Lightning Mountain
>   - update maintainer
>   - add intel,syscon under property list
>   - keep one example instead of two
> 
> 
> 
> Ramuthevar Vadivel Murugan (2):
>   dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY
>   phy: intel-lgm-emmc: Add support for eMMC PHY
> 
>  .../bindings/phy/intel,lgm-emmc-phy.yaml           |  56 ++++
>  drivers/phy/Kconfig                                |   1 +
>  drivers/phy/Makefile                               |   1 +
>  drivers/phy/intel/Kconfig                          |   9 +
>  drivers/phy/intel/Makefile                         |   2 +
>  drivers/phy/intel/phy-intel-emmc.c                 | 283 +++++++++++++++++++++
>  6 files changed, 352 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>  create mode 100644 drivers/phy/intel/Kconfig
>  create mode 100644 drivers/phy/intel/Makefile
>  create mode 100644 drivers/phy/intel/phy-intel-emmc.c
> 

Re: [PATCH v10 0/2] phy: intel-lgm-emmc: Add support for eMMC PHY

[Ramuthevar, Vadivel MuruganX]

Hi,

On 6/1/2020 3:24 PM, Kishon Vijay Abraham I wrote:
>
> On 17/12/19 7:26 AM, Ramuthevar,Vadivel MuruganX wrote:
>> Add eMMC-PHY support for Intel LGM SoC
> merged now, Thanks!

Thanks a lot!!! Kishon for the quick rely and merge.

---
Regards
Vadivel
>
> -Kishon
>
>> changes in v10:
>>    - Rob's review comments update in YAML
>>    - drop clock-names since it is single entry
>>   
>> changes in v9:
>>    - Rob's review comments update in YAML
>>
>> changes in v8:
>>   Remove the extra Signed-of-by
>>
>> changes in v7:
>>   Rebased to maintainer kernel tree phy-tag-5.5
>>
>> changes in v6:
>>     - cobined comaptible strings
>>     - added as contiguous and can be a single entry for reg properties
>> changes in v5:
>>     - earlier Review-by tag given by Rob
>>     - rework done with syscon parent node.
>>
>>   changes in v4:
>>     - As per Rob's review: validate 5.2 and 5.3
>>     - drop unrelated items.
>>
>>   changes in v3:
>>     - resolve 'make dt_binding_check' warnings
>>
>>   changes in v2:
>>     As per Rob Herring review comments, the following updates
>>    - change GPL-2.0 -> (GPL-2.0-only OR BSD-2-Clause)
>>    - filename is the compatible string plus .yaml
>>    - LGM: Lightning Mountain
>>    - update maintainer
>>    - add intel,syscon under property list
>>    - keep one example instead of two
>>
>>
>>
>> Ramuthevar Vadivel Murugan (2):
>>    dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY
>>    phy: intel-lgm-emmc: Add support for eMMC PHY
>>
>>   .../bindings/phy/intel,lgm-emmc-phy.yaml           |  56 ++++
>>   drivers/phy/Kconfig                                |   1 +
>>   drivers/phy/Makefile                               |   1 +
>>   drivers/phy/intel/Kconfig                          |   9 +
>>   drivers/phy/intel/Makefile                         |   2 +
>>   drivers/phy/intel/phy-intel-emmc.c                 | 283 +++++++++++++++++++++
>>   6 files changed, 352 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
>>   create mode 100644 drivers/phy/intel/Kconfig
>>   create mode 100644 drivers/phy/intel/Makefile
>>   create mode 100644 drivers/phy/intel/phy-intel-emmc.c
>>