[PATCH v3 0/2] Amazon's Annapurna Labs Memory Controller EDAC

[PATCH v3 0/2] Amazon's Annapurna Labs Memory Controller EDAC

[Talel Shenhar]

This series introduces support for Amazon's Annapurna Labs Memory
Controller EDAC driver.

Changes since v2:
=================
- added missing includes
- aggregated variables to same line
- removed ranks read
- added spinlock to mc reporting
- made irq handler clearer
- freed irq before freeing device memory
- changed Kconfig to tristate
- added COMPILE_TEST to Kconfig
- converted dt binding to new scheme
- used devm_platform_ioremap_resource instead of get&ioremap

Changes since v1:
=================
- updated dt binding node name and added Rob Reviewed-By
- removed auto selecting of this driver


Talel Shenhar (2):
  dt-bindings: edac: al-mc-edac: Amazon's Annapurna Labs Memory
    Controller EDAC
  EDAC: al-mc-edac: Introduce Amazon's Annapurna Labs Memory Controller
    EDAC

 .../bindings/edac/amazon,al-mc-edac.yaml           |  40 +++
 MAINTAINERS                                        |   7 +
 drivers/edac/Kconfig                               |   7 +
 drivers/edac/Makefile                              |   1 +
 drivers/edac/al_mc_edac.c                          | 358 +++++++++++++++++++++
 5 files changed, 413 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
 create mode 100644 drivers/edac/al_mc_edac.c

-- 
2.7.4

[PATCH v3 1/2] dt-bindings: edac: al-mc-edac: Amazon's Annapurna Labs Memory Controller EDAC

[Talel Shenhar]

Document Amazon's Annapurna Labs Memory Controller EDAC SoC binding.

Signed-off-by: Talel Shenhar <talel@amazon.com>
---
 .../bindings/edac/amazon,al-mc-edac.yaml           | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml

diff --git a/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
new file mode 100644
index 0000000..33da051
--- /dev/null
+++ b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/edac/amazon,al-mc-edac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amazon's Annapurna Labs Memory Controller EDAC
+
+maintainers:
+  - Talel Shenhar <talel@amazon.com>
+  - Talel Shenhar <talelshenhar@gmail.com>
+
+description: |
+  EDAC node is defined to describe on-chip error detection and correction for
+  Amazon's Annapurna Labs Memory Controller.
+
+properties:
+
+  compatible:
+    - const: "amazon,al-mc-edac"
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    edac@f0080000 {
+      compatible = "amazon,al-mc-edac";
+      reg = <0x0 0xf0080000 0x0 0x00010000>;
+      interrupt-parent = <&amazon_al_system_fabric>;
+      interrupt-names = "ue";
+      interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.7.4

[PATCH v3 2/2] EDAC: al-mc-edac: Introduce Amazon's Annapurna Labs Memory Controller EDAC

[Talel Shenhar]

The Amazon's Annapurna Labs Memory Controller EDAC supports ECC capability
for error detection and correction (Single bit error correction, Double
detection). This driver introduces EDAC driver for that capability.

Signed-off-by: Talel Shenhar <talel@amazon.com>
---
 MAINTAINERS               |   7 +
 drivers/edac/Kconfig      |   7 +
 drivers/edac/Makefile     |   1 +
 drivers/edac/al_mc_edac.c | 358 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 373 insertions(+)
 create mode 100644 drivers/edac/al_mc_edac.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e81e60b..8dc496d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -751,6 +751,13 @@ F:	drivers/tty/serial/altera_jtaguart.c
 F:	include/linux/altera_uart.h
 F:	include/linux/altera_jtaguart.h
 
+AMAZON ANNAPURNA LABS MEMORY CONTROLLER EDAC
+M:	Talel Shenhar <talel@amazon.com>
+M:	Talel Shenhar <talelshenhar@gmail.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
+F:	drivers/edac/al_mc_edac.c
+
 AMAZON ANNAPURNA LABS THERMAL MMIO DRIVER
 M:	Talel Shenhar <talel@amazon.com>
 S:	Maintained
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 200c04c..a9f64e8 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -100,6 +100,13 @@ config EDAC_AMD64_ERROR_INJECTION
 	  In addition, there are two control files, inject_read and inject_write,
 	  which trigger the DRAM ECC Read and Write respectively.
 
+config EDAC_AL_MC
+	tristate "Amazon's Annapurna Lab EDAC Memory Controller"
+	depends on (ARCH_ALPINE || COMPILE_TEST)
+	help
+	  Support for error detection and correction for Amazon's Annapurna
+	  Labs Alpine chips which allows 1 bit correction and 2 bits detection.
+
 config EDAC_AMD76X
 	tristate "AMD 76x (760, 762, 768)"
 	depends on PCI && X86_32
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 165ca65e..f6c3a40 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_EDAC_GHES)			+= ghes_edac.o
 edac_mce_amd-y				:= mce_amd.o
 obj-$(CONFIG_EDAC_DECODE_MCE)		+= edac_mce_amd.o
 
+obj-$(CONFIG_EDAC_AL_MC)		+= al_mc_edac.o
 obj-$(CONFIG_EDAC_AMD76X)		+= amd76x_edac.o
 obj-$(CONFIG_EDAC_CPC925)		+= cpc925_edac.o
 obj-$(CONFIG_EDAC_I5000)		+= i5000_edac.o
diff --git a/drivers/edac/al_mc_edac.c b/drivers/edac/al_mc_edac.c
new file mode 100644
index 0000000..f1288c4
--- /dev/null
+++ b/drivers/edac/al_mc_edac.c
@@ -0,0 +1,358 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/edac.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include "edac_module.h"
+
+/* Registers Offset */
+#define AL_MC_MSTR		0x00
+#define AL_MC_ECC_CFG		0x70
+#define AL_MC_ECC_CLEAR		0x7c
+#define AL_MC_ECC_ERR_COUNT	0x80
+#define AL_MC_ECC_CE_ADDR0	0x84
+#define AL_MC_ECC_CE_ADDR1	0x88
+#define AL_MC_ECC_UE_ADDR0	0xa4
+#define AL_MC_ECC_UE_ADDR1	0xa8
+#define AL_MC_ECC_CE_SYND0	0x8c
+#define AL_MC_ECC_CE_SYND1	0x90
+#define AL_MC_ECC_CE_SYND2	0x94
+#define AL_MC_ECC_UE_SYND0	0xac
+#define AL_MC_ECC_UE_SYND1	0xb0
+#define AL_MC_ECC_UE_SYND2	0xb4
+
+/* Registers Fields */
+#define AL_MC_MSTR_DEV_CFG		GENMASK(31, 30)
+#define AL_MC_MSTR_RANKS		GENMASK(27, 24)
+#define AL_MC_MSTR_DATA_BUS_WIDTH	GENMASK(13, 12)
+#define AL_MC_MSTR_DDR4			BIT(4)
+#define AL_MC_MSTR_DDR3			BIT(0)
+
+#define AL_MC_ECC_CFG_SCRUB_DISABLED	BIT(4)
+#define AL_MC_ECC_CFG_ECC_MODE		GENMASK(2, 0)
+
+#define AL_MC_ECC_CLEAR_UE_COUNT	BIT(3)
+#define AL_MC_ECC_CLEAR_CE_COUNT	BIT(2)
+#define AL_MC_ECC_CLEAR_UE_ERR		BIT(1)
+#define AL_MC_ECC_CLEAR_CE_ERR		BIT(0)
+
+#define AL_MC_ECC_ERR_COUNT_UE		GENMASK(31, 16)
+#define AL_MC_ECC_ERR_COUNT_CE		GENMASK(15, 0)
+
+#define AL_MC_ECC_CE_ADDR0_RANK		GENMASK(25, 24)
+#define AL_MC_ECC_CE_ADDR0_ROW		GENMASK(17, 0)
+
+#define AL_MC_ECC_CE_ADDR1_BG		GENMASK(25, 24)
+#define AL_MC_ECC_CE_ADDR1_BANK		GENMASK(18, 16)
+#define AL_MC_ECC_CE_ADDR1_COLUMN	GENMASK(11, 0)
+
+#define AL_MC_ECC_UE_ADDR0_RANK		GENMASK(25, 24)
+#define AL_MC_ECC_UE_ADDR0_ROW		GENMASK(17, 0)
+
+#define AL_MC_ECC_UE_ADDR1_BG		GENMASK(25, 24)
+#define AL_MC_ECC_UE_ADDR1_BANK		GENMASK(18, 16)
+#define AL_MC_ECC_UE_ADDR1_COLUMN	GENMASK(11, 0)
+
+/* Registers Values */
+#define AL_MC_MSTR_DEV_CFG_X4	0
+#define AL_MC_MSTR_DEV_CFG_X8	1
+#define AL_MC_MSTR_DEV_CFG_X16	2
+#define AL_MC_MSTR_DEV_CFG_X32	3
+#define AL_MC_MSTR_RANKS_MAX 4
+#define AL_MC_MSTR_DATA_BUS_WIDTH_X64	0
+
+#define DRV_NAME "al_mc_edac"
+#define AL_MC_EDAC_MSG_MAX 256
+#define AL_MC_EDAC_MSG(message, buffer_size, type,			\
+		       rank, row, bg, bank, column, syn0, syn1, syn2)	\
+	snprintf(message, buffer_size,					\
+		 "%s rank=0x%x row=0x%x bg=0x%x bank=0x%x col=0x%x "	\
+		 "syn0: 0x%x syn1: 0x%x syn2: 0x%x",			\
+		 type == HW_EVENT_ERR_UNCORRECTED ? "UE" : "CE",	\
+		 rank, row, bg, bank, column, syn0, syn1, syn2)
+
+struct al_mc_edac {
+	void __iomem *mmio_base;
+	spinlock_t lock;
+	int irq_ce;
+	int irq_ue;
+};
+
+static int al_mc_edac_handle_ce(struct mem_ctl_info *mci)
+{
+	struct al_mc_edac *al_mc = mci->pvt_info;
+	u32 eccerrcnt, ecccaddr0, ecccaddr1, ecccsyn0, ecccsyn1, ecccsyn2, row;
+	u16 ce_count, column;
+	u8 rank, bg, bank;
+	char msg[AL_MC_EDAC_MSG_MAX];
+	unsigned long flags;
+
+	eccerrcnt = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_ERR_COUNT);
+	ce_count = FIELD_GET(AL_MC_ECC_ERR_COUNT_CE, eccerrcnt);
+	if (!ce_count)
+		return 0;
+
+	ecccaddr0 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_CE_ADDR0);
+	ecccaddr1 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_CE_ADDR1);
+	ecccsyn0 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND0);
+	ecccsyn1 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND1);
+	ecccsyn2 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND2);
+
+	writel(AL_MC_ECC_CLEAR_CE_COUNT | AL_MC_ECC_CLEAR_CE_ERR,
+	       al_mc->mmio_base + AL_MC_ECC_CLEAR);
+
+	dev_dbg(mci->pdev, "eccuaddr0=0x%08x eccuaddr1=0x%08x\n",
+		ecccaddr0, ecccaddr1);
+
+	rank = FIELD_GET(AL_MC_ECC_CE_ADDR0_RANK, ecccaddr0);
+	row = FIELD_GET(AL_MC_ECC_CE_ADDR0_ROW, ecccaddr0);
+
+	bg = FIELD_GET(AL_MC_ECC_CE_ADDR1_BG, ecccaddr1);
+	bank = FIELD_GET(AL_MC_ECC_CE_ADDR1_BANK, ecccaddr1);
+	column = FIELD_GET(AL_MC_ECC_CE_ADDR1_COLUMN, ecccaddr1);
+
+	AL_MC_EDAC_MSG(msg, sizeof(msg), HW_EVENT_ERR_CORRECTED,
+		       rank, row, bg, bank, column,
+		       ecccsyn0, ecccsyn1, ecccsyn2);
+
+	spin_lock_irqsave(&al_mc->lock, flags);
+	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+			     ce_count, 0, 0, 0, 0, 0, -1, mci->ctl_name, msg);
+	spin_unlock_irqrestore(&al_mc->lock, flags);
+
+	return ce_count;
+}
+
+static int al_mc_edac_handle_ue(struct mem_ctl_info *mci)
+{
+	struct al_mc_edac *al_mc = mci->pvt_info;
+	u32 eccerrcnt, eccuaddr0, eccuaddr1, eccusyn0, eccusyn1, eccusyn2, row;
+	u16 ue_count, column;
+	u8 rank, bg, bank;
+	char msg[AL_MC_EDAC_MSG_MAX];
+	unsigned long flags;
+
+	eccerrcnt = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_ERR_COUNT);
+	ue_count = FIELD_GET(AL_MC_ECC_ERR_COUNT_UE, eccerrcnt);
+	if (!ue_count)
+		return 0;
+
+	eccuaddr0 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_ADDR0);
+	eccuaddr1 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_ADDR1);
+	eccusyn0 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND0);
+	eccusyn1 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND1);
+	eccusyn2 = readl_relaxed(al_mc->mmio_base + AL_MC_ECC_UE_SYND2);
+
+	writel(AL_MC_ECC_CLEAR_UE_COUNT | AL_MC_ECC_CLEAR_UE_ERR,
+	       al_mc->mmio_base + AL_MC_ECC_CLEAR);
+
+	dev_dbg(mci->pdev, "eccuaddr0=0x%08x eccuaddr1=0x%08x\n",
+		eccuaddr0, eccuaddr1);
+
+	rank = FIELD_GET(AL_MC_ECC_UE_ADDR0_RANK, eccuaddr0);
+	row = FIELD_GET(AL_MC_ECC_UE_ADDR0_ROW, eccuaddr0);
+
+	bg = FIELD_GET(AL_MC_ECC_UE_ADDR1_BG, eccuaddr1);
+	bank = FIELD_GET(AL_MC_ECC_UE_ADDR1_BANK, eccuaddr1);
+	column = FIELD_GET(AL_MC_ECC_UE_ADDR1_COLUMN, eccuaddr1);
+
+	AL_MC_EDAC_MSG(msg, sizeof(msg), HW_EVENT_ERR_UNCORRECTED,
+		       rank, row, bg, bank, column,
+		       eccusyn0, eccusyn1, eccusyn2);
+
+	spin_lock_irqsave(&al_mc->lock, flags);
+	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+			     ue_count, 0, 0, 0, 0, 0, -1, mci->ctl_name, msg);
+	spin_unlock_irqrestore(&al_mc->lock, flags);
+
+	return ue_count;
+}
+
+static void al_mc_edac_check(struct mem_ctl_info *mci)
+{
+	struct al_mc_edac *al_mc = mci->pvt_info;
+
+	if (al_mc->irq_ue <= 0)
+		al_mc_edac_handle_ue(mci);
+
+	if (al_mc->irq_ce <= 0)
+		al_mc_edac_handle_ce(mci);
+}
+
+static irqreturn_t al_mc_edac_irq_handler_ue(int irq, void *info)
+{
+	struct platform_device *pdev = info;
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+
+	if (al_mc_edac_handle_ue(mci))
+		return IRQ_HANDLED;
+	return IRQ_NONE;
+}
+
+static irqreturn_t al_mc_edac_irq_handler_ce(int irq, void *info)
+{
+	struct platform_device *pdev = info;
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+
+	if (al_mc_edac_handle_ce(mci))
+		return IRQ_HANDLED;
+	return IRQ_NONE;
+}
+
+static enum scrub_type al_mc_edac_get_scrub_mode(void __iomem *mmio_base)
+{
+	u32 ecccfg0;
+
+	ecccfg0 = readl(mmio_base + AL_MC_ECC_CFG);
+
+	if (FIELD_GET(AL_MC_ECC_CFG_SCRUB_DISABLED, ecccfg0))
+		return SCRUB_NONE;
+	else
+		return SCRUB_HW_SRC;
+}
+
+static int al_mc_edac_probe(struct platform_device *pdev)
+{
+	void __iomem *mmio_base;
+	struct edac_mc_layer layers[1];
+	struct mem_ctl_info *mci;
+	struct al_mc_edac *al_mc;
+	int ret;
+
+	mmio_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mmio_base)) {
+		dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
+			PTR_ERR(mmio_base));
+		return PTR_ERR(mmio_base);
+	}
+
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = 1;
+	layers[0].is_virt_csrow = false;
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
+			    sizeof(struct al_mc_edac));
+	if (!mci)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mci);
+	al_mc = mci->pvt_info;
+
+	al_mc->mmio_base = mmio_base;
+
+	al_mc->irq_ue = of_irq_get_byname(pdev->dev.of_node, "ue");
+	if (al_mc->irq_ue <= 0)
+		dev_dbg(&pdev->dev,
+			"no irq defined for ue - falling back to polling\n");
+
+	al_mc->irq_ce = of_irq_get_byname(pdev->dev.of_node, "ce");
+	if (al_mc->irq_ce <= 0)
+		dev_dbg(&pdev->dev,
+			"no irq defined for ce - falling back to polling\n");
+
+	if (al_mc->irq_ue <= 0 || al_mc->irq_ce <= 0)
+		edac_op_state = EDAC_OPSTATE_POLL;
+	else
+		edac_op_state = EDAC_OPSTATE_INT;
+
+	spin_lock_init(&al_mc->lock);
+
+	mci->edac_check = al_mc_edac_check;
+	mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR4;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->mod_name = DRV_NAME;
+	mci->ctl_name = "al_mc";
+	mci->pdev = &pdev->dev;
+	mci->scrub_mode = al_mc_edac_get_scrub_mode(mmio_base);
+
+	ret = edac_mc_add_mc(mci);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"fail to add memory controller device (%d)\n",
+			ret);
+		goto err_add_mc;
+	}
+
+	if (al_mc->irq_ue > 0) {
+		ret = devm_request_irq(&pdev->dev,
+				       al_mc->irq_ue,
+				       al_mc_edac_irq_handler_ue,
+				       IRQF_SHARED,
+				       pdev->name,
+				       pdev);
+		if (ret != 0) {
+			dev_err(&pdev->dev,
+				"failed to request ue irq %d (%d)\n",
+				al_mc->irq_ue, ret);
+			goto err_request_irq;
+		}
+	}
+
+	if (al_mc->irq_ce > 0) {
+		ret = devm_request_irq(&pdev->dev,
+				       al_mc->irq_ce,
+				       al_mc_edac_irq_handler_ce,
+				       IRQF_SHARED,
+				       pdev->name,
+				       pdev);
+		if (ret != 0) {
+			dev_err(&pdev->dev,
+				"failed to request ce irq %d (%d)\n",
+				al_mc->irq_ce, ret);
+			goto err_request_irq;
+		}
+	}
+
+	return 0;
+
+err_request_irq:
+	edac_mc_del_mc(&pdev->dev);
+err_add_mc:
+	edac_mc_free(mci);
+
+	return ret;
+}
+
+static int al_mc_edac_remove(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+	struct al_mc_edac *al_mc = mci->pvt_info;
+
+	if (al_mc->irq_ue > 0)
+		devm_free_irq(&pdev->dev, al_mc->irq_ue, pdev);
+
+	if (al_mc->irq_ce > 0)
+		devm_free_irq(&pdev->dev, al_mc->irq_ce, pdev);
+
+	edac_mc_del_mc(&pdev->dev);
+	edac_mc_free(mci);
+
+	return 0;
+}
+
+static const struct of_device_id al_mc_edac_of_match[] = {
+	{ .compatible = "amazon,al-mc-edac", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, al_mc_edac_of_match);
+
+static struct platform_driver al_mc_edac_driver = {
+	.probe = al_mc_edac_probe,
+	.remove = al_mc_edac_remove,
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = al_mc_edac_of_match,
+	},
+};
+
+module_platform_driver(al_mc_edac_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Talel Shenhar");
+MODULE_DESCRIPTION("Amazon's Annapurna Lab's Memory Controller EDAC Driver");
-- 
2.7.4

Re: [PATCH v3 1/2] dt-bindings: edac: al-mc-edac: Amazon's Annapurna Labs Memory Controller EDAC

[Rob Herring]

On Thu, Oct 03, 2019 at 02:49:22PM +0300, Talel Shenhar wrote:
> Document Amazon's Annapurna Labs Memory Controller EDAC SoC binding.
> 
> Signed-off-by: Talel Shenhar <talel@amazon.com>
> ---
>  .../bindings/edac/amazon,al-mc-edac.yaml           | 40 ++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
> new file mode 100644
> index 0000000..33da051
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/edac/amazon,al-mc-edac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Amazon's Annapurna Labs Memory Controller EDAC
> +
> +maintainers:
> +  - Talel Shenhar <talel@amazon.com>
> +  - Talel Shenhar <talelshenhar@gmail.com>
> +
> +description: |
> +  EDAC node is defined to describe on-chip error detection and correction for
> +  Amazon's Annapurna Labs Memory Controller.
> +
> +properties:
> +
> +  compatible:
> +    - const: "amazon,al-mc-edac"

Fails 'make dt_binding_check'. Drop the '-' as a property is not a list.

The "" are also unnecessary.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +examples:
> +  - |
> +    edac@f0080000 {
> +      compatible = "amazon,al-mc-edac";
> +      reg = <0x0 0xf0080000 0x0 0x00010000>;
> +      interrupt-parent = <&amazon_al_system_fabric>;
> +      interrupt-names = "ue";

Need to document the name or drop as -names on a single entry is 
pointless.

> +      interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> -- 
> 2.7.4
> 

Re: [PATCH v3 1/2] dt-bindings: edac: al-mc-edac: Amazon's Annapurna Labs Memory Controller EDAC

[Shenhar, Talel]

On 10/9/2019 10:16 PM, Rob Herring wrote:
> On Thu, Oct 03, 2019 at 02:49:22PM +0300, Talel Shenhar wrote:
>> Document Amazon's Annapurna Labs Memory Controller EDAC SoC binding.
>>
>> Signed-off-by: Talel Shenhar <talel@amazon.com>
>> ---
>>   .../bindings/edac/amazon,al-mc-edac.yaml           | 40 ++++++++++++++++++++++
>>   1 file changed, 40 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
>> new file mode 100644
>> index 0000000..33da051
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/edac/amazon,al-mc-edac.yaml
>> @@ -0,0 +1,40 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/edac/amazon,al-mc-edac.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Amazon's Annapurna Labs Memory Controller EDAC
>> +
>> +maintainers:
>> +  - Talel Shenhar <talel@amazon.com>
>> +  - Talel Shenhar <talelshenhar@gmail.com>
>> +
>> +description: |
>> +  EDAC node is defined to describe on-chip error detection and correction for
>> +  Amazon's Annapurna Labs Memory Controller.
>> +
>> +properties:
>> +
>> +  compatible:
>> +    - const: "amazon,al-mc-edac"
> Fails 'make dt_binding_check'. Drop the '-' as a property is not a list.
>
> The "" are also unnecessary.
ack, shall be part of v4
>
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +examples:
>> +  - |
>> +    edac@f0080000 {
>> +      compatible = "amazon,al-mc-edac";
>> +      reg = <0x0 0xf0080000 0x0 0x00010000>;
>> +      interrupt-parent = <&amazon_al_system_fabric>;
>> +      interrupt-names = "ue";
> Need to document the name or drop as -names on a single entry is
> pointless.

actually, there are 2 interrupts possible here. so will also fix the 
maxItems of interrupts. will also add the documentation.

shall be part of v4.

>
>> +      interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
>> +    };
>> -- 
>> 2.7.4
>>