linux-kernel - [PATCH 2/2] rtc: k3: detect SoC to determine erratum fix

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Date:   Tue, 16 Aug 2022 12:33:12 -0500
From:   Bryan Brattlof <bb@...com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     Linux RTC <linux-rtc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nishanth Menon <nm@...com>, Bryan Brattlof <bb@...com>
Subject: [PATCH 2/2] rtc: k3: detect SoC to determine erratum fix

To allow new SoCs to use this device without a new compatible string,
use a soc_device_attribute list to define all SoCs affected by the TI
i2327 erratum and require help from their bootloaders to unlock this
device.

Signed-off-by: Bryan Brattlof <bb@...com>
---
 drivers/rtc/rtc-ti-k3.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/drivers/rtc/rtc-ti-k3.c b/drivers/rtc/rtc-ti-k3.c
index fd26be7868d25..68e50c6a72f1d 100644
--- a/drivers/rtc/rtc-ti-k3.c
+++ b/drivers/rtc/rtc-ti-k3.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/sys_soc.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/rtc.h>
@@ -45,14 +46,6 @@
 #define K3RTC_MIN_OFFSET		(-277761)
 #define K3RTC_MAX_OFFSET		(277778)
 
-/**
- * struct ti_k3_rtc_soc_data - Private of compatible data for ti-k3-rtc
- * @unlock_irq_erratum:	Has erratum for unlock infinite IRQs (erratum i2327)
- */
-struct ti_k3_rtc_soc_data {
-	const bool unlock_irq_erratum;
-};
-
 static const struct regmap_config ti_k3_rtc_regmap_config = {
 	.name = "peripheral-registers",
 	.reg_bits = 32,
@@ -118,7 +111,6 @@ static const struct reg_field ti_rtc_reg_fields[] = {
  * @rtc_dev:		rtc device
  * @regmap:		rtc mmio regmap
  * @r_fields:		rtc register fields
- * @soc:		SoC compatible match data
  */
 struct ti_k3_rtc {
 	unsigned int irq;
@@ -127,7 +119,6 @@ struct ti_k3_rtc {
 	struct rtc_device *rtc_dev;
 	struct regmap *regmap;
 	struct regmap_field *r_fields[K3_RTC_MAX_FIELDS];
-	const struct ti_k3_rtc_soc_data *soc;
 };
 
 static int k3rtc_field_read(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f)
@@ -195,6 +186,17 @@ static int k3rtc_unlock_rtc(struct ti_k3_rtc *priv)
 	return ret;
 }
 
+/*
+ * This is the list of SoCs affected by TI's i2327 errata causing the RTC
+ * state-machine to break if not unlocked fast enough during boot. These
+ * SoCs must have the bootloader unlock this device very early in the
+ * boot-flow before we (Linux) can use this device.
+ */
+static const struct soc_device_attribute has_erratum_i2327[] = {
+	{ .family = "AM62X", .revision = "SR1.0" },
+	{ /* sentinel */ }
+};
+
 static int k3rtc_configure(struct device *dev)
 {
 	int ret;
@@ -208,7 +210,7 @@ static int k3rtc_configure(struct device *dev)
 	 *
 	 * In such occurrence, it is assumed that the RTC module is unusable
 	 */
-	if (priv->soc->unlock_irq_erratum) {
+	if (soc_device_match(has_erratum_i2327)) {
 		ret = k3rtc_check_unlocked(priv);
 		/* If there is an error OR if we are locked, return error */
 		if (ret) {
@@ -602,8 +604,6 @@ static int ti_k3_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->rtc_dev))
 		return PTR_ERR(priv->rtc_dev);
 
-	priv->soc = of_device_get_match_data(dev);
-
 	priv->rtc_dev->ops = &ti_k3_rtc_ops;
 	priv->rtc_dev->range_max = (1ULL << 48) - 1;	/* 48Bit seconds */
 	ti_k3_rtc_nvmem_config.priv = priv;
@@ -635,12 +635,8 @@ static int ti_k3_rtc_probe(struct platform_device *pdev)
 	return devm_rtc_nvmem_register(priv->rtc_dev, &ti_k3_rtc_nvmem_config);
 }
 
-static const struct ti_k3_rtc_soc_data ti_k3_am62_data = {
-	.unlock_irq_erratum = true,
-};
-
 static const struct of_device_id ti_k3_rtc_of_match_table[] = {
-	{.compatible = "ti,am62-rtc", .data = &ti_k3_am62_data},
+	{.compatible = "ti,am62-rtc" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, ti_k3_rtc_of_match_table);
-- 
2.17.1