Merge tag 'imx-drivers-6.20' of https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into soc/drivers

i.MX drivers changes for 6.20:

- A few changes from Peng Fan adding dump syslog support for i.MX
  System Manager firmware driver, cleaning up soc-imx9 driver, fixing
  error handling for soc-imx8m driver

* tag 'imx-drivers-6.20' of https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  soc: imx8m: Fix error handling for clk_prepare_enable()
  soc: imx: Spport i.MX9[4,52]
  soc: imx: Use dev_err_probe() for i.MX9
  soc: imx: Use device-managed APIs for i.MX9
  firmware: imx: sm-misc: Dump syslog info
  firmware: arm_scmi: imx: Support getting syslog of MISC protocol

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 119 insertions, 1 deletions

diff --git a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
index 73d80f221b9d..0ada753367ef 100644
--- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
+++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
@@ -28,6 +28,7 @@ enum scmi_imx_misc_protocol_cmd {
 	SCMI_IMX_MISC_DISCOVER_BUILD_INFO = 0x6,
 	SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
 	SCMI_IMX_MISC_CFG_INFO_GET = 0xC,
+	SCMI_IMX_MISC_SYSLOG_GET = 0xD,
 	SCMI_IMX_MISC_BOARD_INFO = 0xE,
 };
 
@@ -88,6 +89,19 @@ struct scmi_imx_misc_cfg_info_out {
 	u8 cfgname[MISC_MAX_CFGNAME];
 };
 
+struct scmi_imx_misc_syslog_in {
+	__le32 flags;
+	__le32 index;
+};
+
+#define REMAINING(x)	le32_get_bits((x), GENMASK(31, 20))
+#define RETURNED(x)	le32_get_bits((x), GENMASK(11, 0))
+
+struct scmi_imx_misc_syslog_out {
+	__le32 numlogflags;
+	__le32 syslog[];
+};
+
 static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle *ph,
 					struct scmi_imx_misc_info *mi)
 {
@@ -370,10 +384,79 @@ static int scmi_imx_misc_cfg_info_get(const struct scmi_protocol_handle *ph)
 	return ret;
 }
 
+struct scmi_imx_misc_syslog_ipriv {
+	u32 *array;
+	u16 *size;
+};
+
+static void iter_misc_syslog_prepare_message(void *message, u32 desc_index,
+					     const void *priv)
+{
+	struct scmi_imx_misc_syslog_in *msg = message;
+
+	msg->flags = cpu_to_le32(0);
+	msg->index = cpu_to_le32(desc_index);
+}
+
+static int iter_misc_syslog_update_state(struct scmi_iterator_state *st,
+					 const void *response, void *priv)
+{
+	const struct scmi_imx_misc_syslog_out *r = response;
+	struct scmi_imx_misc_syslog_ipriv *p = priv;
+
+	st->num_returned = RETURNED(r->numlogflags);
+	st->num_remaining = REMAINING(r->numlogflags);
+	*p->size = st->num_returned + st->num_remaining;
+
+	return 0;
+}
+
+static int
+iter_misc_syslog_process_response(const struct scmi_protocol_handle *ph,
+				  const void *response,
+				  struct scmi_iterator_state *st, void *priv)
+{
+	const struct scmi_imx_misc_syslog_out *r = response;
+	struct scmi_imx_misc_syslog_ipriv *p = priv;
+
+	p->array[st->desc_index + st->loop_idx] =
+		le32_to_cpu(r->syslog[st->loop_idx]);
+
+	return 0;
+}
+
+static int scmi_imx_misc_syslog_get(const struct scmi_protocol_handle *ph, u16 *size,
+				    void *array)
+{
+	struct scmi_iterator_ops ops = {
+		.prepare_message = iter_misc_syslog_prepare_message,
+		.update_state = iter_misc_syslog_update_state,
+		.process_response = iter_misc_syslog_process_response,
+	};
+	struct scmi_imx_misc_syslog_ipriv ipriv = {
+		.array = array,
+		.size = size,
+	};
+	void *iter;
+
+	if (!array || !size || !*size)
+		return -EINVAL;
+
+	iter = ph->hops->iter_response_init(ph, &ops, *size, SCMI_IMX_MISC_SYSLOG_GET,
+					    sizeof(struct scmi_imx_misc_syslog_in),
+					    &ipriv);
+	if (IS_ERR(iter))
+		return PTR_ERR(iter);
+
+	/* If firmware return NOT SUPPORTED, propagate value to caller */
+	return ph->hops->iter_response_run(iter);
+}
+
 static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
 	.misc_ctrl_set = scmi_imx_misc_ctrl_set,
 	.misc_ctrl_get = scmi_imx_misc_ctrl_get,
 	.misc_ctrl_req_notify = scmi_imx_misc_ctrl_notify,
+	.misc_syslog = scmi_imx_misc_syslog_get,
 };
 
 static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c
index fc3ee12c2be8..0a8ada329c9d 100644
--- a/drivers/firmware/imx/sm-misc.c
+++ b/drivers/firmware/imx/sm-misc.c
@@ -3,12 +3,16 @@
  * Copyright 2024 NXP
  */
 
+#include <linux/debugfs.h>
+#include <linux/device/devres.h>
 #include <linux/firmware/imx/sm.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/scmi_protocol.h>
 #include <linux/scmi_imx_protocol.h>
+#include <linux/seq_file.h>
+#include <linux/sizes.h>
 
 static const struct scmi_imx_misc_proto_ops *imx_misc_ctrl_ops;
 static struct scmi_protocol_handle *ph;
@@ -44,10 +48,38 @@ static int scmi_imx_misc_ctrl_notifier(struct notifier_block *nb,
 	return 0;
 }
 
+static int syslog_show(struct seq_file *file, void *priv)
+{
+	/* 4KB is large enough for syslog */
+	void *syslog __free(kfree) = kmalloc(SZ_4K, GFP_KERNEL);
+	/* syslog API use num words, not num bytes */
+	u16 size = SZ_4K / 4;
+	int ret;
+
+	if (!ph)
+		return -ENODEV;
+
+	ret = imx_misc_ctrl_ops->misc_syslog(ph, &size, syslog);
+	if (ret)
+		return ret;
+
+	seq_hex_dump(file, " ", DUMP_PREFIX_NONE, 16, sizeof(u32), syslog, size * 4, false);
+	seq_putc(file, '\n');
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(syslog);
+
+static void scmi_imx_misc_put(void *p)
+{
+	debugfs_remove((struct dentry *)p);
+}
+
 static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
 {
 	const struct scmi_handle *handle = sdev->handle;
 	struct device_node *np = sdev->dev.of_node;
+	struct dentry *scmi_imx_dentry;
 	u32 src_id, flags;
 	int ret, i, num;
 
@@ -98,7 +130,10 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
 		}
 	}
 
-	return 0;
+	scmi_imx_dentry = debugfs_create_dir("scmi_imx", NULL);
+	debugfs_create_file("syslog", 0444, scmi_imx_dentry, &sdev->dev, &syslog_fops);
+
+	return devm_add_action_or_reset(&sdev->dev, scmi_imx_misc_put, scmi_imx_dentry);
 }
 
 static const struct scmi_device_id scmi_id_table[] = {