[PATCH v4 0/4] Add EDAC driver for QCOM SoCs

[PATCH v4 0/4] Add EDAC driver for QCOM SoCs

[Venkata Narendra Kumar Gutta]

This series implements EDAC driver for QCOM SoCs. As of now, this driver
supports EDAC for Last Level Cache Controller (LLCC). LLCC EDAC driver is
to detect and report single and double bit errors on Last Level Cache
Controller (LLCC) cache. Interrupts are triggered when the errors happen
in the cache, the driver handles those interrupts and dumps the syndrome
registers.

The driver functionality is implemented in:
qcom_edac.c : This platform driver registers to edac framework and
handles the single and double bit errors in cache by registering
interrupt handlers.

llcc-slice.c: It invokes the llcc edac driver and passes platform
data to it.

This patchset depends on the LLCC driver, which is part of 4.19 release.
Link: https://patchwork.kernel.org/patch/10422531/
Link: http://lists-archives.com/linux-kernel/29157082-dt-bindings-documentation-for-qcom-llcc.html

Patch wise description given below:

Patch 1 adds the broadcast base regmap for broadcast writes in llcc.

Patch 2 adds the required changes to register edac driver from llcc driver.

Patch 3 adds the EDAC driver support for QCOM SoCS.

Patch 4 updates the dt bindings of llcc.

Changes since v3:
  * Updated the Kconfig and addressed minor comments in the driver

Changes since v2:
  * Modified the edac driver and Kconfig
    -  removed unnecessary header files, typecasting and redundant comments.
    -  Changed the initialization of reg_data datastructure to static,
       Also updated the llcc_edac_reg_data member names and datatypes.
    -  Removed "EDAC_QCOM_LLCC_PANIC_ON_UE" Kconfig variable

Changes since v1:
  * Modified the edac driver
    - Removed duplicate functions that are used to dump the syndrome registers,
      replaced that with a common function and a reg_data datastructure.
    - Removed structure containing function pointers.
    - Addressed comments on error handling to clear the interrupt status.
  * updated Kconfig

Changes since v0:
  * Added EDAC_QCOM config and updated the driver
  * Addressed comments related to indentation and other minor ones

Channagoud Kadabi (1):
  drivers: edac: Add EDAC driver support for QCOM SoCs

Venkata Narendra Kumar Gutta (3):
  drivers: soc: Add broadcast base for Last Level Cache Controller
    (LLCC)
  drivers: soc: Add support to register LLCC EDAC driver
  dt-bindings: msm: Update documentation of qcom,llcc

 .../devicetree/bindings/arm/msm/qcom,llcc.txt      |  19 +-
 MAINTAINERS                                        |   8 +
 drivers/edac/Kconfig                               |  14 +
 drivers/edac/Makefile                              |   1 +
 drivers/edac/qcom_edac.c                           | 420 +++++++++++++++++++++
 drivers/soc/qcom/llcc-slice.c                      |  73 ++--
 include/linux/soc/qcom/llcc-qcom.h                 |  30 +-
 7 files changed, 537 insertions(+), 28 deletions(-)
 create mode 100644 drivers/edac/qcom_edac.c

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v4 1/4] drivers: soc: Add broadcast base for Last Level Cache Controller (LLCC)

[Venkata Narendra Kumar Gutta]

Currently, broadcast base is set to end of the LLCC banks, which may
not be correct always. As the number of banks may vary for each chipset
and the broadcast base could be at a different address as well. This info
depends on the chipset, so get the broadcast base info from the device
tree (DT). Add broadcast base in LLCC driver and use this for broadcast
writes.

Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
---
 drivers/soc/qcom/llcc-slice.c      | 55 +++++++++++++++++++++++---------------
 include/linux/soc/qcom/llcc-qcom.h |  4 +--
 2 files changed, 35 insertions(+), 24 deletions(-)

diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
index fcaad1a..a63640d 100644
--- a/drivers/soc/qcom/llcc-slice.c
+++ b/drivers/soc/qcom/llcc-slice.c
@@ -105,22 +105,24 @@ static int llcc_update_act_ctrl(u32 sid,
 	u32 slice_status;
 	int ret;
 
-	act_ctrl_reg = drv_data->bcast_off + LLCC_TRP_ACT_CTRLn(sid);
-	status_reg = drv_data->bcast_off + LLCC_TRP_STATUSn(sid);
+	act_ctrl_reg = LLCC_TRP_ACT_CTRLn(sid);
+	status_reg = LLCC_TRP_STATUSn(sid);
 
 	/* Set the ACTIVE trigger */
 	act_ctrl_reg_val |= ACT_CTRL_ACT_TRIG;
-	ret = regmap_write(drv_data->regmap, act_ctrl_reg, act_ctrl_reg_val);
+	ret = regmap_write(drv_data->bcast_regmap, act_ctrl_reg,
+				act_ctrl_reg_val);
 	if (ret)
 		return ret;
 
 	/* Clear the ACTIVE trigger */
 	act_ctrl_reg_val &= ~ACT_CTRL_ACT_TRIG;
-	ret = regmap_write(drv_data->regmap, act_ctrl_reg, act_ctrl_reg_val);
+	ret = regmap_write(drv_data->bcast_regmap, act_ctrl_reg,
+				act_ctrl_reg_val);
 	if (ret)
 		return ret;
 
-	ret = regmap_read_poll_timeout(drv_data->regmap, status_reg,
+	ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
 				      slice_status, !(slice_status & status),
 				      0, LLCC_STATUS_READ_DELAY);
 	return ret;
@@ -225,16 +227,13 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev)
 	int ret;
 	const struct llcc_slice_config *llcc_table;
 	struct llcc_slice_desc desc;
-	u32 bcast_off = drv_data->bcast_off;
 
 	sz = drv_data->cfg_size;
 	llcc_table = drv_data->cfg;
 
 	for (i = 0; i < sz; i++) {
-		attr1_cfg = bcast_off +
-				LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
-		attr0_cfg = bcast_off +
-				LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
+		attr1_cfg = LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
+		attr0_cfg = LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
 
 		attr1_val = llcc_table[i].cache_mode;
 		attr1_val |= llcc_table[i].probe_target_ways <<
@@ -259,10 +258,12 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev)
 		attr0_val = llcc_table[i].res_ways & ATTR0_RES_WAYS_MASK;
 		attr0_val |= llcc_table[i].bonus_ways << ATTR0_BONUS_WAYS_SHIFT;
 
-		ret = regmap_write(drv_data->regmap, attr1_cfg, attr1_val);
+		ret = regmap_write(drv_data->bcast_regmap, attr1_cfg,
+					attr1_val);
 		if (ret)
 			return ret;
-		ret = regmap_write(drv_data->regmap, attr0_cfg, attr0_val);
+		ret = regmap_write(drv_data->bcast_regmap, attr0_cfg,
+					attr0_val);
 		if (ret)
 			return ret;
 		if (llcc_table[i].activate_on_init) {
@@ -278,24 +279,36 @@ int qcom_llcc_probe(struct platform_device *pdev,
 {
 	u32 num_banks;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
-	void __iomem *base;
+	struct resource *llcc_banks_res, *llcc_bcast_res;
+	void __iomem *llcc_banks_base, *llcc_bcast_base;
 	int ret, i;
 
 	drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
 	if (!drv_data)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	llcc_banks_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+							"llcc_base");
+	llcc_banks_base = devm_ioremap_resource(&pdev->dev, llcc_banks_res);
+	if (IS_ERR(llcc_banks_base))
+		return PTR_ERR(llcc_banks_base);
 
-	drv_data->regmap = devm_regmap_init_mmio(dev, base,
-					&llcc_regmap_config);
+	drv_data->regmap = devm_regmap_init_mmio(dev, llcc_banks_base,
+						&llcc_regmap_config);
 	if (IS_ERR(drv_data->regmap))
 		return PTR_ERR(drv_data->regmap);
 
+	llcc_bcast_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+							"llcc_broadcast_base");
+	llcc_bcast_base = devm_ioremap_resource(&pdev->dev, llcc_bcast_res);
+	if (IS_ERR(llcc_bcast_base))
+		return PTR_ERR(llcc_bcast_base);
+
+	drv_data->bcast_regmap = devm_regmap_init_mmio(dev, llcc_bcast_base,
+							&llcc_regmap_config);
+	if (IS_ERR(drv_data->bcast_regmap))
+		return PTR_ERR(drv_data->bcast_regmap);
+
 	ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
 						&num_banks);
 	if (ret)
@@ -317,8 +330,6 @@ int qcom_llcc_probe(struct platform_device *pdev,
 	for (i = 0; i < num_banks; i++)
 		drv_data->offsets[i] = i * BANK_OFFSET_STRIDE;
 
-	drv_data->bcast_off = num_banks * BANK_OFFSET_STRIDE;
-
 	drv_data->bitmap = devm_kcalloc(dev,
 	BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
 						GFP_KERNEL);
diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
index 7e3b9c6..c681e79 100644
--- a/include/linux/soc/qcom/llcc-qcom.h
+++ b/include/linux/soc/qcom/llcc-qcom.h
@@ -70,22 +70,22 @@ struct llcc_slice_config {
 /**
  * llcc_drv_data - Data associated with the llcc driver
  * @regmap: regmap associated with the llcc device
+ * @bcast_regmap: regmap associated with llcc broadcast offset
  * @cfg: pointer to the data structure for slice configuration
  * @lock: mutex associated with each slice
  * @cfg_size: size of the config data table
  * @max_slices: max slices as read from device tree
- * @bcast_off: Offset of the broadcast bank
  * @num_banks: Number of llcc banks
  * @bitmap: Bit map to track the active slice ids
  * @offsets: Pointer to the bank offsets array
  */
 struct llcc_drv_data {
 	struct regmap *regmap;
+	struct regmap *bcast_regmap;
 	const struct llcc_slice_config *cfg;
 	struct mutex lock;
 	u32 cfg_size;
 	u32 max_slices;
-	u32 bcast_off;
 	u32 num_banks;
 	unsigned long *bitmap;
 	u32 *offsets;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v4 2/4] drivers: soc: Add support to register LLCC EDAC driver

[Venkata Narendra Kumar Gutta]

Cache error reporting controller detects and reports single and
double bit errors on Last Level Cache Controller (LLCC) cache.
Add required support to register LLCC EDAC driver as platform driver,
from LLCC driver.

Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
---
 drivers/soc/qcom/llcc-slice.c      | 18 ++++++++++++++++--
 include/linux/soc/qcom/llcc-qcom.h |  2 ++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
index a63640d..09c8bb0 100644
--- a/drivers/soc/qcom/llcc-slice.c
+++ b/drivers/soc/qcom/llcc-slice.c
@@ -224,7 +224,7 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev)
 	u32 attr0_val;
 	u32 max_cap_cacheline;
 	u32 sz;
-	int ret;
+	int ret = 0;
 	const struct llcc_slice_config *llcc_table;
 	struct llcc_slice_desc desc;
 
@@ -282,6 +282,7 @@ int qcom_llcc_probe(struct platform_device *pdev,
 	struct resource *llcc_banks_res, *llcc_bcast_res;
 	void __iomem *llcc_banks_base, *llcc_bcast_base;
 	int ret, i;
+	struct platform_device *llcc_edac;
 
 	drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
 	if (!drv_data)
@@ -341,6 +342,19 @@ int qcom_llcc_probe(struct platform_device *pdev,
 	mutex_init(&drv_data->lock);
 	platform_set_drvdata(pdev, drv_data);
 
-	return qcom_llcc_cfg_program(pdev);
+	ret = qcom_llcc_cfg_program(pdev);
+	if (ret)
+		return ret;
+
+	drv_data->ecc_irq = platform_get_irq(pdev, 0);
+	if (drv_data->ecc_irq >= 0) {
+		llcc_edac = platform_device_register_data(&pdev->dev,
+						"qcom_llcc_edac", -1, drv_data,
+						sizeof(*drv_data));
+		if (IS_ERR(llcc_edac))
+			dev_err(dev, "Failed to register llcc edac driver\n");
+	}
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(qcom_llcc_probe);
diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
index c681e79..2e4b34d 100644
--- a/include/linux/soc/qcom/llcc-qcom.h
+++ b/include/linux/soc/qcom/llcc-qcom.h
@@ -78,6 +78,7 @@ struct llcc_slice_config {
  * @num_banks: Number of llcc banks
  * @bitmap: Bit map to track the active slice ids
  * @offsets: Pointer to the bank offsets array
+ * @ecc_irq: interrupt for llcc cache error detection and reporting
  */
 struct llcc_drv_data {
 	struct regmap *regmap;
@@ -89,6 +90,7 @@ struct llcc_drv_data {
 	u32 num_banks;
 	unsigned long *bitmap;
 	u32 *offsets;
+	int ecc_irq;
 };
 
 #if IS_ENABLED(CONFIG_QCOM_LLCC)
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[Venkata Narendra Kumar Gutta]

From: Channagoud Kadabi <ckadabi@codeaurora.org>

Add error reporting driver for Single Bit Errors (SBEs) and Double Bit
Errors (DBEs). As of now, this driver supports error reporting for
Last Level Cache Controller (LLCC) of Tag RAM and Data RAM. Interrupts
are triggered when the errors happen in the cache, the driver handles
those interrupts and dumps the syndrome registers.

Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Co-developed-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
---
 MAINTAINERS                        |   8 +
 drivers/edac/Kconfig               |  14 ++
 drivers/edac/Makefile              |   1 +
 drivers/edac/qcom_edac.c           | 420 +++++++++++++++++++++++++++++++++++++
 include/linux/soc/qcom/llcc-qcom.h |  24 +++
 5 files changed, 467 insertions(+)
 create mode 100644 drivers/edac/qcom_edac.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 0a23427..0bff713 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5227,6 +5227,14 @@ L:	linux-edac@vger.kernel.org
 S:	Maintained
 F:	drivers/edac/ti_edac.c
 
+EDAC-QUALCOMM
+M:	Channagoud Kadabi <ckadabi@codeaurora.org>
+M:	Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
+L:	linux-arm-msm@vger.kernel.org
+L:	linux-edac@vger.kernel.org
+S:	Maintained
+F:	drivers/edac/qcom_edac.c
+
 EDIROL UA-101/UA-1000 DRIVER
 M:	Clemens Ladisch <clemens@ladisch.de>
 L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 57304b2..c4e3472 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -460,4 +460,18 @@ config EDAC_TI
 	  Support for error detection and correction on the
           TI SoCs.
 
+config EDAC_QCOM
+	tristate "QCOM EDAC Controller"
+	depends on ARCH_QCOM && QCOM_LLCC
+	help
+	  Support for error detection and correction on the
+	  QCOM SoCs.
+
+	  This driver reports Single Bit Errors (SBEs) and Double Bit Errors (DBEs).
+	  As of now, it supports error reporting for Last Level Cache Controller (LLCC)
+	  of Tag RAM and Data RAM.
+
+	  For debugging issues having to do with stability and overall system
+	  health, you should probably say 'Y' here.
+
 endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 02b43a7..716096d 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -77,3 +77,4 @@ obj-$(CONFIG_EDAC_ALTERA)		+= altera_edac.o
 obj-$(CONFIG_EDAC_SYNOPSYS)		+= synopsys_edac.o
 obj-$(CONFIG_EDAC_XGENE)		+= xgene_edac.o
 obj-$(CONFIG_EDAC_TI)			+= ti_edac.o
+obj-$(CONFIG_EDAC_QCOM)			+= qcom_edac.o
diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
new file mode 100644
index 0000000..1773216
--- /dev/null
+++ b/drivers/edac/qcom_edac.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/edac.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/soc/qcom/llcc-qcom.h>
+
+#include "edac_mc.h"
+#include "edac_device.h"
+
+#define EDAC_LLCC                       "qcom_llcc"
+
+#define LLCC_ERP_PANIC_ON_UE            1
+
+#define TRP_SYN_REG_CNT                 6
+#define DRP_SYN_REG_CNT                 8
+
+#define LLCC_COMMON_STATUS0             0x0003000c
+#define LLCC_LB_CNT_MASK                GENMASK(31, 28)
+#define LLCC_LB_CNT_SHIFT               28
+
+/* Single & double bit syndrome register offsets */
+#define TRP_ECC_SB_ERR_SYN0             0x0002304c
+#define TRP_ECC_DB_ERR_SYN0             0x00020370
+#define DRP_ECC_SB_ERR_SYN0             0x0004204c
+#define DRP_ECC_DB_ERR_SYN0             0x00042070
+
+/* Error register offsets */
+#define TRP_ECC_ERROR_STATUS1           0x00020348
+#define TRP_ECC_ERROR_STATUS0           0x00020344
+#define DRP_ECC_ERROR_STATUS1           0x00042048
+#define DRP_ECC_ERROR_STATUS0           0x00042044
+
+/* TRP, DRP interrupt register offsets */
+#define DRP_INTERRUPT_STATUS            0x00041000
+#define TRP_INTERRUPT_0_STATUS          0x00020480
+#define DRP_INTERRUPT_CLEAR             0x00041008
+#define DRP_ECC_ERROR_CNTR_CLEAR        0x00040004
+#define TRP_INTERRUPT_0_CLEAR           0x00020484
+#define TRP_ECC_ERROR_CNTR_CLEAR        0x00020440
+
+/* Mask and shift macros */
+#define ECC_DB_ERR_COUNT_MASK           GENMASK(4, 0)
+#define ECC_DB_ERR_WAYS_MASK            GENMASK(31, 16)
+#define ECC_DB_ERR_WAYS_SHIFT           BIT(4)
+
+#define ECC_SB_ERR_COUNT_MASK           GENMASK(23, 16)
+#define ECC_SB_ERR_COUNT_SHIFT          BIT(4)
+#define ECC_SB_ERR_WAYS_MASK            GENMASK(15, 0)
+
+#define SB_ECC_ERROR                    BIT(0)
+#define DB_ECC_ERROR                    BIT(1)
+
+#define DRP_TRP_INT_CLEAR               GENMASK(1, 0)
+#define DRP_TRP_CNT_CLEAR               GENMASK(1, 0)
+
+/* Config registers offsets*/
+#define DRP_ECC_ERROR_CFG               0x00040000
+
+/* Tag RAM, Data RAM interrupt register offsets */
+#define CMN_INTERRUPT_0_ENABLE          0x0003001c
+#define CMN_INTERRUPT_2_ENABLE          0x0003003c
+#define TRP_INTERRUPT_0_ENABLE          0x00020488
+#define DRP_INTERRUPT_ENABLE            0x0004100c
+
+#define SB_ERROR_THRESHOLD              0x1
+#define SB_ERROR_THRESHOLD_SHIFT        24
+#define SB_DB_TRP_INTERRUPT_ENABLE      0x3
+#define TRP0_INTERRUPT_ENABLE           0x1
+#define DRP0_INTERRUPT_ENABLE           BIT(6)
+#define SB_DB_DRP_INTERRUPT_ENABLE      0x3
+
+enum {
+	LLCC_DRAM_CE = 0,
+	LLCC_DRAM_UE,
+	LLCC_TRAM_CE,
+	LLCC_TRAM_UE,
+};
+
+static const struct llcc_edac_reg_data edac_reg_data[] = {
+	[LLCC_DRAM_CE] = {
+		.name = "DRAM Single-bit",
+		.synd_reg = DRP_ECC_SB_ERR_SYN0,
+		.count_status_reg = DRP_ECC_ERROR_STATUS1,
+		.ways_status_reg = DRP_ECC_ERROR_STATUS0,
+		.reg_cnt = DRP_SYN_REG_CNT,
+		.count_mask = ECC_SB_ERR_COUNT_MASK,
+		.ways_mask = ECC_SB_ERR_WAYS_MASK,
+		.count_shift = ECC_SB_ERR_COUNT_SHIFT,
+	},
+	[LLCC_DRAM_UE] = {
+		.name = "DRAM Double-bit",
+		.synd_reg = DRP_ECC_DB_ERR_SYN0,
+		.count_status_reg = DRP_ECC_ERROR_STATUS1,
+		.ways_status_reg = DRP_ECC_ERROR_STATUS0,
+		.reg_cnt = DRP_SYN_REG_CNT,
+		.count_mask = ECC_DB_ERR_COUNT_MASK,
+		.ways_mask = ECC_DB_ERR_WAYS_MASK,
+		.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
+	},
+	[LLCC_TRAM_CE] = {
+		.name = "TRAM Single-bit",
+		.synd_reg = TRP_ECC_SB_ERR_SYN0,
+		.count_status_reg = TRP_ECC_ERROR_STATUS1,
+		.ways_status_reg = TRP_ECC_ERROR_STATUS0,
+		.reg_cnt = TRP_SYN_REG_CNT,
+		.count_mask = ECC_SB_ERR_COUNT_MASK,
+		.ways_mask = ECC_SB_ERR_WAYS_MASK,
+		.count_shift = ECC_SB_ERR_COUNT_SHIFT,
+	},
+	[LLCC_TRAM_UE] = {
+		.name = "TRAM Double-bit",
+		.synd_reg = TRP_ECC_DB_ERR_SYN0,
+		.count_status_reg = TRP_ECC_ERROR_STATUS1,
+		.ways_status_reg = TRP_ECC_ERROR_STATUS0,
+		.reg_cnt = TRP_SYN_REG_CNT,
+		.count_mask = ECC_DB_ERR_COUNT_MASK,
+		.ways_mask = ECC_DB_ERR_WAYS_MASK,
+		.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
+	},
+};
+
+static int qcom_llcc_core_setup(struct regmap *llcc_bcast_regmap)
+{
+	u32 sb_err_threshold;
+	int ret;
+
+	/*
+	 * Configure interrupt enable registers such that Tag, Data RAM related
+	 * interrupts are propagated to interrupt controller for servicing
+	 */
+	ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE,
+				 TRP0_INTERRUPT_ENABLE,
+				 TRP0_INTERRUPT_ENABLE);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(llcc_bcast_regmap, TRP_INTERRUPT_0_ENABLE,
+				 SB_DB_TRP_INTERRUPT_ENABLE,
+				 SB_DB_TRP_INTERRUPT_ENABLE);
+	if (ret)
+		return ret;
+
+	sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
+	ret = regmap_write(llcc_bcast_regmap, DRP_ECC_ERROR_CFG,
+			   sb_err_threshold);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE,
+				 DRP0_INTERRUPT_ENABLE,
+				 DRP0_INTERRUPT_ENABLE);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(llcc_bcast_regmap, DRP_INTERRUPT_ENABLE,
+			   SB_DB_DRP_INTERRUPT_ENABLE);
+	return ret;
+}
+
+/* Clear the error interrupt and counter registers */
+static int
+qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
+{
+	int ret = 0;
+
+	switch (err_type) {
+	case LLCC_DRAM_CE:
+	case LLCC_DRAM_UE:
+		ret = regmap_write(drv->bcast_regmap, DRP_INTERRUPT_CLEAR,
+				   DRP_TRP_INT_CLEAR);
+		if (ret)
+			return ret;
+
+		ret = regmap_write(drv->bcast_regmap, DRP_ECC_ERROR_CNTR_CLEAR,
+				   DRP_TRP_CNT_CLEAR);
+		if (ret)
+			return ret;
+		break;
+	case LLCC_TRAM_CE:
+	case LLCC_TRAM_UE:
+		ret = regmap_write(drv->bcast_regmap, TRP_INTERRUPT_0_CLEAR,
+				   DRP_TRP_INT_CLEAR);
+		if (ret)
+			return ret;
+
+		ret = regmap_write(drv->bcast_regmap, TRP_ECC_ERROR_CNTR_CLEAR,
+				   DRP_TRP_CNT_CLEAR);
+		if (ret)
+			return ret;
+		break;
+	default:
+		ret = -EINVAL;
+		edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
+			    err_type);
+	}
+	return ret;
+}
+
+/* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
+static int
+dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
+{
+	struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
+	int err_cnt, err_ways, ret, i;
+	u32 synd_reg, synd_val;
+
+	for (i = 0; i < reg_data.reg_cnt; i++) {
+		synd_reg = reg_data.synd_reg + (i * 4);
+		ret = regmap_read(drv->regmap, drv->offsets[bank] + synd_reg,
+				  &synd_val);
+		if (ret)
+			goto clear;
+
+		edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n",
+			    reg_data.name, i, synd_val);
+	}
+
+	ret = regmap_read(drv->regmap,
+			  drv->offsets[bank] + reg_data.count_status_reg,
+			  &err_cnt);
+	if (ret)
+		goto clear;
+
+	err_cnt &= reg_data.count_mask;
+	err_cnt >>= reg_data.count_shift;
+	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n",
+		    reg_data.name, err_cnt);
+
+	ret = regmap_read(drv->regmap,
+			  drv->offsets[bank] + reg_data.ways_status_reg,
+			  &err_ways);
+	if (ret)
+		goto clear;
+
+	err_ways &= reg_data.ways_mask;
+	err_ways >>= reg_data.ways_shift;
+
+	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n",
+		    reg_data.name, err_ways);
+
+clear:
+	return qcom_llcc_clear_error_status(err_type, drv);
+}
+
+static int
+dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
+{
+	struct llcc_drv_data *drv = edev_ctl->pvt_info;
+	int ret;
+
+	ret = dump_syn_reg_values(drv, bank, err_type);
+	if (ret)
+		return ret;
+
+	switch (err_type) {
+	case LLCC_DRAM_CE:
+		edac_device_handle_ce(edev_ctl, 0, bank,
+				      "LLCC Data RAM correctable Error");
+		break;
+	case LLCC_DRAM_UE:
+		edac_device_handle_ue(edev_ctl, 0, bank,
+				      "LLCC Data RAM uncorrectable Error");
+		break;
+	case LLCC_TRAM_CE:
+		edac_device_handle_ce(edev_ctl, 0, bank,
+				      "LLCC Tag RAM correctable Error");
+		break;
+	case LLCC_TRAM_UE:
+		edac_device_handle_ue(edev_ctl, 0, bank,
+				      "LLCC Tag RAM uncorrectable Error");
+		break;
+	default:
+		ret = -EINVAL;
+		edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
+			    err_type);
+	}
+
+	return ret;
+}
+
+static irqreturn_t
+llcc_ecc_irq_handler(int irq, void *edev_ctl)
+{
+	struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
+	struct llcc_drv_data *drv = edac_dev_ctl->pvt_info;
+	irqreturn_t irq_rc = IRQ_NONE;
+	u32 drp_error, trp_error, i;
+	bool irq_handled;
+	int ret;
+
+	/* Iterate over the banks and look for Tag RAM or Data RAM errors */
+	for (i = 0; i < drv->num_banks; i++) {
+		ret = regmap_read(drv->regmap,
+				  drv->offsets[i] + DRP_INTERRUPT_STATUS,
+				  &drp_error);
+
+		if (!ret && (drp_error & SB_ECC_ERROR)) {
+			edac_printk(KERN_CRIT, EDAC_LLCC,
+				    "Single Bit Error detected in Data RAM\n");
+			ret = dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i);
+		} else if (!ret && (drp_error & DB_ECC_ERROR)) {
+			edac_printk(KERN_CRIT, EDAC_LLCC,
+				    "Double Bit Error detected in Data RAM\n");
+			ret = dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i);
+		}
+		if (!ret)
+			irq_handled = true;
+
+		ret = regmap_read(drv->regmap,
+				  drv->offsets[i] + TRP_INTERRUPT_0_STATUS,
+				  &trp_error);
+
+		if (!ret && (trp_error & SB_ECC_ERROR)) {
+			edac_printk(KERN_CRIT, EDAC_LLCC,
+				    "Single Bit Error detected in Tag RAM\n");
+			ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
+		} else if (!ret && (trp_error & DB_ECC_ERROR)) {
+			edac_printk(KERN_CRIT, EDAC_LLCC,
+				    "Double Bit Error detected in Tag RAM\n");
+			ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
+		}
+		if (!ret)
+			irq_handled = true;
+	}
+
+	if (irq_handled)
+		irq_rc = IRQ_HANDLED;
+
+	return irq_rc;
+}
+
+static int qcom_llcc_edac_probe(struct platform_device *pdev)
+{
+	struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
+	struct edac_device_ctl_info *edev_ctl;
+	struct device *dev = &pdev->dev;
+	int ecc_irq;
+	int rc;
+
+	rc = qcom_llcc_core_setup(llcc_driv_data->bcast_regmap);
+	if (rc)
+		return rc;
+
+	/* Allocate edac control info */
+	edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
+					      llcc_driv_data->num_banks, 1,
+					      NULL, 0,
+					      edac_device_alloc_index());
+
+	if (!edev_ctl)
+		return -ENOMEM;
+
+	edev_ctl->dev = dev;
+	edev_ctl->mod_name = dev_name(dev);
+	edev_ctl->dev_name = dev_name(dev);
+	edev_ctl->ctl_name = "llcc";
+	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;
+	edev_ctl->pvt_info = llcc_driv_data;
+
+	rc = edac_device_add_device(edev_ctl);
+	if (rc)
+		goto out_mem;
+
+	platform_set_drvdata(pdev, edev_ctl);
+
+	/* Request for ecc irq */
+	ecc_irq = llcc_driv_data->ecc_irq;
+	if (ecc_irq < 0) {
+		rc = -ENODEV;
+		goto out_dev;
+	}
+	rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
+			      IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
+	if (rc)
+		goto out_dev;
+
+	return rc;
+
+out_dev:
+	edac_device_del_device(edev_ctl->dev);
+out_mem:
+	edac_device_free_ctl_info(edev_ctl);
+
+	return rc;
+}
+
+static int qcom_llcc_edac_remove(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev);
+
+	edac_device_del_device(edev_ctl->dev);
+	edac_device_free_ctl_info(edev_ctl);
+
+	return 0;
+}
+
+static const struct of_device_id qcom_llcc_edac_match_table[] = {
+	{ .compatible = "qcom,llcc-edac" },
+	{ },
+};
+
+static struct platform_driver qcom_llcc_edac_driver = {
+	.probe = qcom_llcc_edac_probe,
+	.remove = qcom_llcc_edac_remove,
+	.driver = {
+		.name = "qcom_llcc_edac",
+		.of_match_table = qcom_llcc_edac_match_table,
+	},
+};
+module_platform_driver(qcom_llcc_edac_driver);
+
+MODULE_DESCRIPTION("QCOM EDAC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
index 2e4b34d..69c285b 100644
--- a/include/linux/soc/qcom/llcc-qcom.h
+++ b/include/linux/soc/qcom/llcc-qcom.h
@@ -93,6 +93,30 @@ struct llcc_drv_data {
 	int ecc_irq;
 };
 
+/**
+ * llcc_edac_reg_data - llcc edac registers data for each error type
+ * @name: Name of the error
+ * @synd_reg: Syndrome register address
+ * @count_status_reg: Status register address to read the error count
+ * @ways_status_reg: Status register address to read the error ways
+ * @reg_cnt: Number of registers
+ * @count_mask: Mask value to get the error count
+ * @ways_mask: Mask value to get the error ways
+ * @count_shift: Shift value to get the error count
+ * @ways_shift: Shift value to get the error ways
+ */
+struct llcc_edac_reg_data {
+	char *name;
+	u64 synd_reg;
+	u64 count_status_reg;
+	u64 ways_status_reg;
+	u32 reg_cnt;
+	u32 count_mask;
+	u32 ways_mask;
+	u8  count_shift;
+	u8  ways_shift;
+};
+
 #if IS_ENABLED(CONFIG_QCOM_LLCC)
 /**
  * llcc_slice_getd - get llcc slice descriptor
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v4 4/4] dt-bindings: msm: Update documentation of qcom,llcc

[Venkata Narendra Kumar Gutta]

Add reg-names and interrupts for LLCC documentation and the usage
examples. llcc broadcast base is added in addition to llcc base,
which is used for llcc broadcast writes.

Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/arm/msm/qcom,llcc.txt         | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
index 5e85749..2e007dc 100644
--- a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
+++ b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
@@ -16,11 +16,26 @@ Properties:
 - reg:
 	Usage: required
 	Value Type: <prop-encoded-array>
-	Definition: Start address and the the size of the register region.
+	Definition: The first element specifies the llcc base start address and
+		    the size of the register region. The second element specifies
+		    the llcc broadcast base address and size of the register region.
+
+- reg-names:
+        Usage: required
+        Value Type: <stringlist>
+        Definition: Register region names. Must be "llcc_base", "llcc_bcast_base".
+
+- interrupts:
+	Usage: required
+	Definition: The interrupt is associated with the llcc edac device.
+			It's used for llcc cache single and double bit error detection
+			and reporting.
 
 Example:
 
 	cache-controller@1100000 {
 		compatible = "qcom,sdm845-llcc";
-		reg = <0x1100000 0x250000>;
+		reg = <0x1100000 0x200000>, <0x1300000 0x50000> ;
+		reg-names = "llcc_base", "llcc_bcast_base";
+		interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
 	};
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[Sai Prakash Ranjan]

On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
> +static const struct of_device_id qcom_llcc_edac_match_table[] = {
> +	{ .compatible = "qcom,llcc-edac" },
> +	{ },
> +};
> +
> 
Hi Venkata,

Devicetree binding for llcc is updated, but what about this compatible?

Regards,
Sai

Re: [PATCH v4 4/4] dt-bindings: msm: Update documentation of qcom,llcc

[Sai Prakash Ranjan]

On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
> Add reg-names and interrupts for LLCC documentation and the usage
> examples. llcc broadcast base is added in addition to llcc base,
> which is used for llcc broadcast writes.
> 
> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>   .../devicetree/bindings/arm/msm/qcom,llcc.txt         | 19 +++++++++++++++++--
>   1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
> index 5e85749..2e007dc 100644
> --- a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
> @@ -16,11 +16,26 @@ Properties:
>   - reg:
>   	Usage: required
>   	Value Type: <prop-encoded-array>
> -	Definition: Start address and the the size of the register region.
> +	Definition: The first element specifies the llcc base start address and
> +		    the size of the register region. The second element specifies
> +		    the llcc broadcast base address and size of the register region.
> +
> +- reg-names:
> +        Usage: required
> +        Value Type: <stringlist>
> +        Definition: Register region names. Must be "llcc_base", "llcc_bcast_base".
> +
> +- interrupts:
> +	Usage: required
> +	Definition: The interrupt is associated with the llcc edac device.
> +			It's used for llcc cache single and double bit error detection
> +			and reporting.
>   
>   Example:
>   
>   	cache-controller@1100000 {
>   		compatible = "qcom,sdm845-llcc";
> -		reg = <0x1100000 0x250000>;
> +		reg = <0x1100000 0x200000>, <0x1300000 0x50000> ;
> +		reg-names = "llcc_base", "llcc_bcast_base";
> +		interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>   	};
> 

Also, llcc_bcast_base should be llcc_broadcast_base as given in Patch 1 
or you can change to llcc_bcast_base in Patch 1 of series.

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[vnkgutta]

On 2018-09-06 05:38, Sai Prakash Ranjan wrote:
> On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
>> +static const struct of_device_id qcom_llcc_edac_match_table[] = {
>> +	{ .compatible = "qcom,llcc-edac" },
>> +	{ },
>> +};
>> +
>> 
> Hi Venkata,
> 
> Devicetree binding for llcc is updated, but what about this compatible?

Does it need documentation too? I was not sure if I should add 
documentation for this or not!

> 
> Regards,
> Sai

Re: [PATCH v4 4/4] dt-bindings: msm: Update documentation of qcom,llcc

[vnkgutta]

On 2018-09-06 06:16, Sai Prakash Ranjan wrote:
> On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
>> Add reg-names and interrupts for LLCC documentation and the usage
>> examples. llcc broadcast base is added in addition to llcc base,
>> which is used for llcc broadcast writes.
>> 
>> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
>> Reviewed-by: Rob Herring <robh@kernel.org>
>> ---
>>   .../devicetree/bindings/arm/msm/qcom,llcc.txt         | 19 
>> +++++++++++++++++--
>>   1 file changed, 17 insertions(+), 2 deletions(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt 
>> b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
>> index 5e85749..2e007dc 100644
>> --- a/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
>> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
>> @@ -16,11 +16,26 @@ Properties:
>>   - reg:
>>   	Usage: required
>>   	Value Type: <prop-encoded-array>
>> -	Definition: Start address and the the size of the register region.
>> +	Definition: The first element specifies the llcc base start address 
>> and
>> +		    the size of the register region. The second element specifies
>> +		    the llcc broadcast base address and size of the register 
>> region.
>> +
>> +- reg-names:
>> +        Usage: required
>> +        Value Type: <stringlist>
>> +        Definition: Register region names. Must be "llcc_base", 
>> "llcc_bcast_base".
>> +
>> +- interrupts:
>> +	Usage: required
>> +	Definition: The interrupt is associated with the llcc edac device.
>> +			It's used for llcc cache single and double bit error detection
>> +			and reporting.
>>     Example:
>>     	cache-controller@1100000 {
>>   		compatible = "qcom,sdm845-llcc";
>> -		reg = <0x1100000 0x250000>;
>> +		reg = <0x1100000 0x200000>, <0x1300000 0x50000> ;
>> +		reg-names = "llcc_base", "llcc_bcast_base";
>> +		interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>>   	};
>> 
> 
> Also, llcc_bcast_base should be llcc_broadcast_base as given in Patch
> 1 or you can change to llcc_bcast_base in Patch 1 of series.

My bad, I'll correct that in the next series.

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[Sai Prakash Ranjan]

On 9/7/2018 4:01 AM, vnkgutta@codeaurora.org wrote:
> On 2018-09-06 05:38, Sai Prakash Ranjan wrote:
>> On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
>>> +static const struct of_device_id qcom_llcc_edac_match_table[] = {
>>> +    { .compatible = "qcom,llcc-edac" },
>>> +    { },
>>> +};
>>> +
>>>
>> Hi Venkata,
>>
>> Devicetree binding for llcc is updated, but what about this compatible?
> 
> Does it need documentation too? I was not sure if I should add 
> documentation for this or not!
> 

It does not require a separate binding, what I meant was to add this 
compatible in the llcc binding itself, maybe as a subnode if it is correct.

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[Borislav Petkov]

On Tue, Sep 04, 2018 at 04:22:24PM -0700, Venkata Narendra Kumar Gutta wrote:
> From: Channagoud Kadabi <ckadabi@codeaurora.org>
> 
> Add error reporting driver for Single Bit Errors (SBEs) and Double Bit
> Errors (DBEs). As of now, this driver supports error reporting for
> Last Level Cache Controller (LLCC) of Tag RAM and Data RAM. Interrupts
> are triggered when the errors happen in the cache, the driver handles
> those interrupts and dumps the syndrome registers.
> 
> Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
> Co-developed-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
> ---
>  MAINTAINERS                        |   8 +
>  drivers/edac/Kconfig               |  14 ++
>  drivers/edac/Makefile              |   1 +
>  drivers/edac/qcom_edac.c           | 420 +++++++++++++++++++++++++++++++++++++
>  include/linux/soc/qcom/llcc-qcom.h |  24 +++
>  5 files changed, 467 insertions(+)
>  create mode 100644 drivers/edac/qcom_edac.c

EDAC bits look ok now, feel free to carry it through the qualcomm tree:

Acked-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[vnkgutta]

On 2018-09-06 22:02, Sai Prakash Ranjan wrote:
> On 9/7/2018 4:01 AM, vnkgutta@codeaurora.org wrote:
>> On 2018-09-06 05:38, Sai Prakash Ranjan wrote:
>>> On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
>>>> +static const struct of_device_id qcom_llcc_edac_match_table[] = {
>>>> +    { .compatible = "qcom,llcc-edac" },
>>>> +    { },
>>>> +};
>>>> +
>>>> 
>>> Hi Venkata,
>>> 
>>> Devicetree binding for llcc is updated, but what about this 
>>> compatible?
>> 
>> Does it need documentation too? I was not sure if I should add 
>> documentation for this or not!
>> 
> 
> It does not require a separate binding, what I meant was to add this
> compatible in the llcc binding itself, maybe as a subnode if it is
> correct.

Hi,

We aren't really using this of_device_id structure, as this driver is 
being registered from LLCC through
platform_register_device_data(...). This structure initialization is 
just dead code as this driver won't be probed based on the DT entries.

Hence removing this compatible property and the corresponding struct in 
the next patchset.

So, this doesn't need an extra binding/documentation.

Re: [PATCH v4 3/4] drivers: edac: Add EDAC driver support for QCOM SoCs

[Sai Prakash Ranjan]

On 9/11/2018 4:15 AM, vnkgutta@codeaurora.org wrote:
> On 2018-09-06 22:02, Sai Prakash Ranjan wrote:
>> On 9/7/2018 4:01 AM, vnkgutta@codeaurora.org wrote:
>>> On 2018-09-06 05:38, Sai Prakash Ranjan wrote:
>>>> On 9/5/2018 4:52 AM, Venkata Narendra Kumar Gutta wrote:
>>>>> +static const struct of_device_id qcom_llcc_edac_match_table[] = {
>>>>> +    { .compatible = "qcom,llcc-edac" },
>>>>> +    { },
>>>>> +};
>>>>> +
>>>>>
>>>> Hi Venkata,
>>>>
>>>> Devicetree binding for llcc is updated, but what about this compatible?
>>>
>>> Does it need documentation too? I was not sure if I should add 
>>> documentation for this or not!
>>>
>>
>> It does not require a separate binding, what I meant was to add this
>> compatible in the llcc binding itself, maybe as a subnode if it is
>> correct.
> 
> Hi,
> 
> We aren't really using this of_device_id structure, as this driver is 
> being registered from LLCC through
> platform_register_device_data(...). This structure initialization is 
> just dead code as this driver won't be probed based on the DT entries.
> 
> Hence removing this compatible property and the corresponding struct in 
> the next patchset.
> 
> So, this doesn't need an extra binding/documentation.

Ok. Now that you have removed the compatible, it should be fine.

Thanks