[PATCH v3 0/6] soc/tegra: fuse: Add ACPI support

[PATCH v3 0/6] soc/tegra: fuse: Add ACPI support

[Kartik]

This series of patches add ACPI support for Tegra194 and Tegra234 in
Tegra fuse and apbmisc drivers. It also adds support for Tegra241
which uses ACPI boot.

Kartik (6):
  soc/tegra: fuse: Refactor resource mapping
  soc/tegra: fuse: Add tegra_acpi_init_apbmisc()
  soc/tegra: fuse: Add function to add lookups
  soc/tegra: fuse: Add function to print SKU info
  soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234
  soc/tegra: fuse: Add support for Tegra241

 drivers/soc/tegra/Kconfig              |   5 ++
 drivers/soc/tegra/fuse/fuse-tegra.c    | 119 +++++++++++++++++++------
 drivers/soc/tegra/fuse/fuse-tegra30.c  |  21 +++++
 drivers/soc/tegra/fuse/fuse.h          |   5 ++
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 110 +++++++++++++++++++----
 include/soc/tegra/fuse.h               |   1 +
 6 files changed, 217 insertions(+), 44 deletions(-)

---
v2 -> v3:
	* Minor changes in following patches:
	  soc/tegra: fuse: Add tegra_acpi_init_apbmisc()
	  soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

v1 -> v2:
	* Used '--patience' while formatting patches.
	* Added "soc/tegra: fuse: Refactor resource mapping" to share
	  the common code between tegra_init_apbmisc() and
	  tegra_acpi_init_apbmisc() functions.
	* Dropped "soc/tegra: fuse: Add function to register nvmem"
	  as ACPI and device-tree boot are sharing the same probe.
	  So, no need to refactor the code here.
---
-- 
2.34.1

[PATCH v3 1/6] soc/tegra: fuse: Refactor resource mapping

[Kartik]

To prepare for adding ACPI support to the tegra-apbmisc driver,
relocate the code responsible for mapping memory resources from
the function ‘tegra_init_apbmisc’ to the function
‘tegra_init_apbmisc_resources.’ This adjustment will allow the
code to be shared between ‘tegra_init_apbmisc’ and the upcoming
‘tegra_acpi_init_apbmisc’ function.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 37 +++++++++++++++-----------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index da970f3dbf35..06c1b3a2c7ec 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -160,9 +160,28 @@ void __init tegra_init_revision(void)
 	tegra_sku_info.platform = tegra_get_platform();
 }
 
-void __init tegra_init_apbmisc(void)
+static void tegra_init_apbmisc_resources(struct resource *apbmisc,
+					 struct resource *straps)
 {
 	void __iomem *strapping_base;
+
+	apbmisc_base = ioremap(apbmisc->start, resource_size(apbmisc));
+	if (apbmisc_base)
+		chipid = readl_relaxed(apbmisc_base + 4);
+	else
+		pr_err("failed to map APBMISC registers\n");
+
+	strapping_base = ioremap(straps->start, resource_size(straps));
+	if (strapping_base) {
+		strapping = readl_relaxed(strapping_base);
+		iounmap(strapping_base);
+	} else {
+		pr_err("failed to map strapping options registers\n");
+	}
+}
+
+void __init tegra_init_apbmisc(void)
+{
 	struct resource apbmisc, straps;
 	struct device_node *np;
 
@@ -219,21 +238,7 @@ void __init tegra_init_apbmisc(void)
 		}
 	}
 
-	apbmisc_base = ioremap(apbmisc.start, resource_size(&apbmisc));
-	if (!apbmisc_base) {
-		pr_err("failed to map APBMISC registers\n");
-	} else {
-		chipid = readl_relaxed(apbmisc_base + 4);
-	}
-
-	strapping_base = ioremap(straps.start, resource_size(&straps));
-	if (!strapping_base) {
-		pr_err("failed to map strapping options registers\n");
-	} else {
-		strapping = readl_relaxed(strapping_base);
-		iounmap(strapping_base);
-	}
-
+	tegra_init_apbmisc_resources(&apbmisc, &straps);
 	long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
 
 put:
-- 
2.34.1

Re: [PATCH v3 1/6] soc/tegra: fuse: Refactor resource mapping

[Andy Shevchenko]

On Thu, Sep 07, 2023 at 12:40:47PM +0530, Kartik wrote:
> To prepare for adding ACPI support to the tegra-apbmisc driver,
> relocate the code responsible for mapping memory resources from
> the function ‘tegra_init_apbmisc’ to the function
> ‘tegra_init_apbmisc_resources.’ This adjustment will allow the
> code to be shared between ‘tegra_init_apbmisc’ and the upcoming
> ‘tegra_acpi_init_apbmisc’ function.

...

> -void __init tegra_init_apbmisc(void)
> +static void tegra_init_apbmisc_resources(struct resource *apbmisc,
> +					 struct resource *straps)
>  {

> +}
> +
> +void __init tegra_init_apbmisc(void)

Looks like the patches can be improved by using --patience when you format
patches before sending.

-- 
With Best Regards,
Andy Shevchenko

[PATCH v3 2/6] soc/tegra: fuse: Add tegra_acpi_init_apbmisc()

[Kartik]

In preparation to ACPI support in Tegra fuse driver add function
tegra_acpi_init_apbmisc() to initialize tegra-apbmisc driver.
Also, document the reason of calling tegra_init_apbmisc() at early init.

Note that function tegra_acpi_init_apbmisc() is not placed in the __init
section, because it will be called during probe.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v2 -> v3:
	* Fix build warnings seen when CONFIG_ACPI is disabled by moving
	  tegra_init_apbmisc table inside #ifdef CONFIG_ACPI block.

v1 -> v2:
	* Update ACPI ID table 'tegra_init_apbmisc'.
	* Add comment to document the reason to call tegra_init_apbmisc
	  at early init.
	* Fix an issue where acpi_dev_free_resource_list() and
	* acpi_dev_put() were not called if
	  acpi_dev_get_memory_resources() returned 1.
	* Update logic to fetch memory resources in
	  tegra_acpi_init_apbmisc().
	* Fix build errors seen when CONFIG_ACPI is disabled.
---
 drivers/soc/tegra/fuse/fuse.h          |  1 +
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 72 ++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
index 90f23be73894..a41e9f85281a 100644
--- a/drivers/soc/tegra/fuse/fuse.h
+++ b/drivers/soc/tegra/fuse/fuse.h
@@ -69,6 +69,7 @@ struct tegra_fuse {
 
 void tegra_init_revision(void);
 void tegra_init_apbmisc(void);
+void tegra_acpi_init_apbmisc(void);
 
 u32 __init tegra_fuse_read_spare(unsigned int spare);
 u32 __init tegra_fuse_read_early(unsigned int offset);
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index 06c1b3a2c7ec..e2ca93de6c1f 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -3,9 +3,11 @@
  * Copyright (c) 2014-2023, NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/export.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 
@@ -180,6 +182,12 @@ static void tegra_init_apbmisc_resources(struct resource *apbmisc,
 	}
 }
 
+/**
+ * tegra_init_apbmisc - Initializes Tegra APBMISC and Strapping registers.
+ *
+ * This is called during early init as some of the old 32-bit ARM code needs
+ * information from the APBMISC registers very early during boot.
+ */
 void __init tegra_init_apbmisc(void)
 {
 	struct resource apbmisc, straps;
@@ -244,3 +252,67 @@ void __init tegra_init_apbmisc(void)
 put:
 	of_node_put(np);
 }
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id apbmisc_acpi_match[] = {
+	{ "NVDA2010" },
+	{ /* sentinel */ }
+};
+
+void tegra_acpi_init_apbmisc(void)
+{
+	struct resource *resources[2] = { NULL };
+	struct resource_entry *rentry, *tmp;
+	struct acpi_device *adev = NULL;
+	struct list_head resource_list;
+	int rcount = 0;
+	int ret;
+
+	adev = acpi_dev_get_first_match_dev(apbmisc_acpi_match[0].id, NULL, -1);
+	if (!adev)
+		return;
+
+	INIT_LIST_HEAD(&resource_list);
+
+	ret = acpi_dev_get_memory_resources(adev, &resource_list);
+	if (ret < 0) {
+		pr_err("failed to get APBMISC memory resources");
+		goto out_put_acpi_dev;
+	}
+
+	/*
+	 * Get required memory resources.
+	 *
+	 * resources[0]: apbmisc.
+	 * resources[1]: straps.
+	 */
+	resource_list_for_each_entry_safe(rentry, tmp, &resource_list) {
+		if (rcount >= ARRAY_SIZE(resources))
+			break;
+
+		resources[rcount++] = rentry->res;
+	}
+
+	if (!resources[0]) {
+		pr_err("failed to get APBMISC registers\n");
+		goto out_free_resource_list;
+	}
+
+	if (!resources[1]) {
+		pr_err("failed to get strapping options registers\n");
+		goto out_free_resource_list;
+	}
+
+	tegra_init_apbmisc_resources(resources[0], resources[1]);
+
+out_free_resource_list:
+	acpi_dev_free_resource_list(&resource_list);
+
+out_put_acpi_dev:
+	acpi_dev_put(adev);
+}
+#else
+void tegra_acpi_init_apbmisc(void)
+{
+}
+#endif
-- 
2.34.1

[PATCH v3 3/6] soc/tegra: fuse: Add function to add lookups

[Kartik]

Add helper function tegra_fuse_add_lookups() to register Tegra fuse
nvmem lookups. So, this can be shared between tegra_fuse_init() and
ACPI probe, which is to be introduced later.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v1 -> v2:
	* Use size_mul to calculate lookups array size.
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index a2c28f493a75..821bb485ec45 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -113,6 +113,24 @@ static void tegra_fuse_restore(void *base)
 	fuse->clk = NULL;
 }
 
+static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
+{
+	size_t size;
+
+	if (!fuse->soc->lookups)
+		return 0;
+
+	size = size_mul(sizeof(*fuse->lookups), fuse->soc->num_lookups);
+
+	fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
+	if (!fuse->lookups)
+		return -ENOMEM;
+
+	nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
+
+	return 0;
+}
+
 static int tegra_fuse_probe(struct platform_device *pdev)
 {
 	void __iomem *base = fuse->base;
@@ -407,6 +425,7 @@ static int __init tegra_init_fuse(void)
 	const struct of_device_id *match;
 	struct device_node *np;
 	struct resource regs;
+	int err;
 
 	tegra_init_apbmisc();
 
@@ -504,12 +523,10 @@ static int __init tegra_init_fuse(void)
 	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
 		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
 
-	if (fuse->soc->lookups) {
-		size_t size = sizeof(*fuse->lookups) * fuse->soc->num_lookups;
-
-		fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
-		if (fuse->lookups)
-			nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
+	err = tegra_fuse_add_lookups(fuse);
+	if (err) {
+		pr_err("failed to add FUSE lookups\n");
+		return err;
 	}
 
 	return 0;
-- 
2.34.1

Re: [PATCH v3 3/6] soc/tegra: fuse: Add function to add lookups

[Andy Shevchenko]

On Thu, Sep 07, 2023 at 12:40:49PM +0530, Kartik wrote:
> Add helper function tegra_fuse_add_lookups() to register Tegra fuse
> nvmem lookups. So, this can be shared between tegra_fuse_init() and
> ACPI probe, which is to be introduced later.

...

> +static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
> +{
> +	size_t size;
> +
> +	if (!fuse->soc->lookups)
> +		return 0;

> +	size = size_mul(sizeof(*fuse->lookups), fuse->soc->num_lookups);
> +
> +	fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
> +	if (!fuse->lookups)
> +		return -ENOMEM;

Why not introducing kmemdup_array()?

> +	nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
> +
> +	return 0;
> +}

...

> +	err = tegra_fuse_add_lookups(fuse);
> +	if (err) {
> +		pr_err("failed to add FUSE lookups\n");

Why pr_err() and not dev_err()?

> +		return err;
>  	}
>  
>  	return 0;

These four lines can be just shortened to

	return err;

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/6] soc/tegra: fuse: Add function to add lookups

[Kartik]

On Thu, 2023-09-07 at 14:35, Andy Shevchenko wrote:
>On Thu, Sep 07, 2023 at 12:40:49PM +0530, Kartik wrote:
>> Add helper function tegra_fuse_add_lookups() to register Tegra fuse
>> nvmem lookups. So, this can be shared between tegra_fuse_init() and
>> ACPI probe, which is to be introduced later.
>
>...
>
>> +static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
>> +{
>> +	size_t size;
>> +
>> +	if (!fuse->soc->lookups)
>> +		return 0;
>
>> +	size = size_mul(sizeof(*fuse->lookups), fuse->soc->num_lookups);
>> +
>> +	fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
>> +	if (!fuse->lookups)
>> +		return -ENOMEM;
>
>Why not introducing kmemdup_array()?

Introduced this in v4.

>
>> +	nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
>> +
>> +	return 0;
>> +}
>
>...
>
>> +	err = tegra_fuse_add_lookups(fuse);
>> +	if (err) {
>> +		pr_err("failed to add FUSE lookups\n");
>
>Why pr_err() and not dev_err()?

This is called before tegra_fuse_probe in device-tree boot hence the
reason behing using pr_err instead of dev_err.

>
>> +		return err;
>>  	}
>>  
>>  	return 0;
>
>These four lines can be just shortened to
>
>	return err;
>

Updated this in v4.

>-- 
>With Best Regards,
>Andy Shevchenko

Regards,
Kartik

[PATCH v3 4/6] soc/tegra: fuse: Add function to print SKU info

[Kartik]

Add helper function tegra_fuse_print_sku_info() to print Tegra SKU
information. So, it can be shared between tegra_fuse_init() and
ACPI probe which is to be introduced later.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v1 -> v2:
	* Renamed tegra_fuse_pr_sku_info() as
	  tegra_fuse_print_sku_info().
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 821bb485ec45..64f7001823ce 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -113,6 +113,16 @@ static void tegra_fuse_restore(void *base)
 	fuse->clk = NULL;
 }
 
+static void tegra_fuse_print_sku_info(struct tegra_sku_info *tegra_sku_info)
+{
+	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
+		tegra_revision_name[tegra_sku_info->revision],
+		tegra_sku_info->sku_id, tegra_sku_info->cpu_process_id,
+		tegra_sku_info->soc_process_id);
+	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
+		tegra_sku_info->cpu_speedo_id, tegra_sku_info->soc_speedo_id);
+}
+
 static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
 {
 	size_t size;
@@ -516,12 +526,7 @@ static int __init tegra_init_fuse(void)
 
 	fuse->soc->init(fuse);
 
-	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
-		tegra_revision_name[tegra_sku_info.revision],
-		tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
-		tegra_sku_info.soc_process_id);
-	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
-		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
+	tegra_fuse_print_sku_info(&tegra_sku_info);
 
 	err = tegra_fuse_add_lookups(fuse);
 	if (err) {
-- 
2.34.1

[PATCH v3 5/6] soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

[Kartik]

Add ACPI support for Tegra194 & Tegra243 SoC's. This requires
following modifications to the probe when ACPI boot is used:
 - Initialize soc data.
 - Add nvmem lookups.
 - Register soc device.
 - use devm_clk_get_optional() instead of devm_clk_get() to get
   fuse->clk, as fuse clocks are not required when using ACPI boot.

Also, drop '__init' keyword for tegra_soc_device_register() as this is also
used by tegra_fuse_probe() and use dev_err_probe() wherever applicable.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v2 -> v3:
	* Updated commit message to specify changes related to inclusion
	  of dev_err_probe().

v1 -> v2:
	* Updated ACPI ID table 'tegra_fuse_acpi_match'.
	* Removed ',' after "{ /* sentinel */ }" in
	  'tegra_fuse_acpi_match'.
	* Using same probe for ACPI and device-tree boot.
	* Added code for required initialization when ACPI boot is used.
	* Make clocks optional for ACPI.
	* Use dev_err_probe() wherever applicable.
	* Check if clock has been initialized only when device-tree
	  boot is used.
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 68 ++++++++++++++++++++++-------
 1 file changed, 52 insertions(+), 16 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 64f7001823ce..f35f9651a653 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -3,11 +3,13 @@
  * Copyright (c) 2013-2023, NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/kobject.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/mod_devicetable.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/nvmem-provider.h>
 #include <linux/of.h>
@@ -94,6 +96,11 @@ static const struct of_device_id tegra_fuse_match[] = {
 	{ /* sentinel */ }
 };
 
+static const struct acpi_device_id tegra_fuse_acpi_match[] = {
+	{ "NVDA200F" },
+	{ /* sentinel */ }
+};
+
 static int tegra_fuse_read(void *priv, unsigned int offset, void *value,
 			   size_t bytes)
 {
@@ -148,6 +155,37 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 	struct resource *res;
 	int err;
 
+	/* Initialize the soc data and lookups if using ACPI boot. */
+	if (is_acpi_node(pdev->dev.fwnode) && !fuse->soc) {
+		u8 chip;
+
+		tegra_acpi_init_apbmisc();
+
+		chip = tegra_get_chip_id();
+		switch (chip) {
+#if defined(CONFIG_ARCH_TEGRA_194_SOC)
+		case TEGRA194:
+			fuse->soc = &tegra194_fuse_soc;
+			break;
+#endif
+#if defined(CONFIG_ARCH_TEGRA_234_SOC)
+		case TEGRA234:
+			fuse->soc = &tegra234_fuse_soc;
+			break;
+#endif
+		default:
+			return dev_err_probe(&pdev->dev, -EINVAL, "Unsupported SoC: %02x\n", chip);
+		}
+
+		fuse->soc->init(fuse);
+		tegra_fuse_print_sku_info(&tegra_sku_info);
+		tegra_soc_device_register();
+
+		err = tegra_fuse_add_lookups(fuse);
+		if (err)
+			return dev_err_probe(&pdev->dev, err, "failed to add FUSE lookups\n");
+	}
+
 	err = devm_add_action(&pdev->dev, tegra_fuse_restore, (void __force *)base);
 	if (err)
 		return err;
@@ -158,14 +196,9 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		return PTR_ERR(fuse->base);
 	fuse->phys = res->start;
 
-	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
-	if (IS_ERR(fuse->clk)) {
-		if (PTR_ERR(fuse->clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
-				PTR_ERR(fuse->clk));
-
-		return PTR_ERR(fuse->clk);
-	}
+	fuse->clk = devm_clk_get_optional(&pdev->dev, "fuse");
+	if (IS_ERR(fuse->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n");
 
 	platform_set_drvdata(pdev, fuse);
 	fuse->dev = &pdev->dev;
@@ -207,12 +240,8 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 	}
 
 	fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse");
-	if (IS_ERR(fuse->rst)) {
-		err = PTR_ERR(fuse->rst);
-		dev_err(&pdev->dev, "failed to get FUSE reset: %pe\n",
-			fuse->rst);
-		return err;
-	}
+	if (IS_ERR(fuse->rst))
+		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->rst), "failed to get FUSE reset");
 
 	/*
 	 * FUSE clock is enabled at a boot time, hence this resume/suspend
@@ -294,6 +323,7 @@ static struct platform_driver tegra_fuse_driver = {
 	.driver = {
 		.name = "tegra-fuse",
 		.of_match_table = tegra_fuse_match,
+		.acpi_match_table = tegra_fuse_acpi_match,
 		.pm = &tegra_fuse_pm,
 		.suppress_bind_attrs = true,
 	},
@@ -315,7 +345,13 @@ u32 __init tegra_fuse_read_early(unsigned int offset)
 
 int tegra_fuse_readl(unsigned long offset, u32 *value)
 {
-	if (!fuse->read || !fuse->clk)
+	/*
+	 * Wait for fuse->clk to be initialized if device-tree boot is used.
+	 */
+	if (is_of_node(fuse->dev->fwnode) && !fuse->clk)
+		return -EPROBE_DEFER;
+
+	if (!fuse->read)
 		return -EPROBE_DEFER;
 
 	if (IS_ERR(fuse->clk))
@@ -398,7 +434,7 @@ const struct attribute_group tegra194_soc_attr_group = {
 };
 #endif
 
-struct device * __init tegra_soc_device_register(void)
+struct device *tegra_soc_device_register(void)
 {
 	struct soc_device_attribute *attr;
 	struct soc_device *dev;
-- 
2.34.1

Re: [PATCH v3 5/6] soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

[Andy Shevchenko]

On Thu, Sep 07, 2023 at 12:40:51PM +0530, Kartik wrote:
> Add ACPI support for Tegra194 & Tegra243 SoC's. This requires
> following modifications to the probe when ACPI boot is used:
>  - Initialize soc data.
>  - Add nvmem lookups.
>  - Register soc device.
>  - use devm_clk_get_optional() instead of devm_clk_get() to get
>    fuse->clk, as fuse clocks are not required when using ACPI boot.
> 
> Also, drop '__init' keyword for tegra_soc_device_register() as this is also
> used by tegra_fuse_probe() and use dev_err_probe() wherever applicable.

...

> +static const struct acpi_device_id tegra_fuse_acpi_match[] = {
> +	{ "NVDA200F" },
> +	{ /* sentinel */ }
> +};

Where is NODULE_DEVICE_TABLE() for it? And why it's located here and not
at the its first user's location?

...

> +	if (is_acpi_node(pdev->dev.fwnode) && !fuse->soc) {

We do not dereference fwnode in struct device, use dev_fwnode() for that.

...

> +		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n");

> +		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->rst), "failed to get FUSE reset");

This requires a separate patch.

...

> +	/*
> +	 * Wait for fuse->clk to be initialized if device-tree boot is used.
> +	 */

> +	if (is_of_node(fuse->dev->fwnode) && !fuse->clk)

dev_fwnode()

The second check is questionable. If you get it NULL, it won't ever appear.
Did I miss anything?

> +		return -EPROBE_DEFER;

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 5/6] soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

[Kartik]

On Mon, 2023-09-11 at 10:46, Andy Shevchenko wrote:
>On Thu, Sep 07, 2023 at 12:40:51PM +0530, Kartik wrote:
>> Add ACPI support for Tegra194 & Tegra243 SoC's. This requires
>> following modifications to the probe when ACPI boot is used:
>>  - Initialize soc data.
>>  - Add nvmem lookups.
>>  - Register soc device.
>>  - use devm_clk_get_optional() instead of devm_clk_get() to get
>>    fuse->clk, as fuse clocks are not required when using ACPI boot.
>> 
>> Also, drop '__init' keyword for tegra_soc_device_register() as this is also
>> used by tegra_fuse_probe() and use dev_err_probe() wherever applicable.
>
>...
>
>> +static const struct acpi_device_id tegra_fuse_acpi_match[] = {
>> +	{ "NVDA200F" },
>> +	{ /* sentinel */ }
>> +};
>
>Where is NODULE_DEVICE_TABLE() for it? And why it's located here and not
>at the its first user's location?

Fixed this in v4.

>
>...
>
>> +	if (is_acpi_node(pdev->dev.fwnode) && !fuse->soc) {
>
>We do not dereference fwnode in struct device, use dev_fwnode() for that.
>
>...
>

Fixed this in v4.

>> +		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n");
>
>> +		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->rst), "failed to get FUSE reset");
>
>This requires a separate patch.
>

Pushed a separate patch in v4 of this series.

>...
>
>> +	/*
>> +	 * Wait for fuse->clk to be initialized if device-tree boot is used.
>> +	 */
>
>> +	if (is_of_node(fuse->dev->fwnode) && !fuse->clk)
>
>dev_fwnode()
>
>The second check is questionable. If you get it NULL, it won't ever appear.
>Did I miss anything?
>

If tegra_fuse_readl is called before Tegra fuse driver is probed, then
fuse->clk will NULL. Hence, this is required here.

>> +		return -EPROBE_DEFER;
>
>-- 
>With Best Regards,
>Andy Shevchenko

Regards,
Kartik

[PATCH v3 6/6] soc/tegra: fuse: Add support for Tegra241

[Kartik]

Add support for Tegra241 which use ACPI boot.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v1 -> v2:
	* Removed few entries from tegra241_fuse_soc which were
	  initilized as NULL or 0.
---
 drivers/soc/tegra/Kconfig              |  5 +++++
 drivers/soc/tegra/fuse/fuse-tegra.c    |  5 +++++
 drivers/soc/tegra/fuse/fuse-tegra30.c  | 21 +++++++++++++++++++++
 drivers/soc/tegra/fuse/fuse.h          |  4 ++++
 drivers/soc/tegra/fuse/tegra-apbmisc.c |  1 +
 include/soc/tegra/fuse.h               |  1 +
 6 files changed, 37 insertions(+)

diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
index 6f3098822969..5f5d9d663fef 100644
--- a/drivers/soc/tegra/Kconfig
+++ b/drivers/soc/tegra/Kconfig
@@ -133,6 +133,11 @@ config ARCH_TEGRA_234_SOC
 	help
 	  Enable support for the NVIDIA Tegra234 SoC.
 
+config ARCH_TEGRA_241_SOC
+	bool "NVIDIA Tegra241 SoC"
+	help
+	  Enable support for the NVIDIA Tegra241 SoC.
+
 endif
 endif
 
diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index f35f9651a653..eb11465e8092 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -172,6 +172,11 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		case TEGRA234:
 			fuse->soc = &tegra234_fuse_soc;
 			break;
+#endif
+#if defined(CONFIG_ARCH_TEGRA_241_SOC)
+		case TEGRA241:
+			fuse->soc = &tegra241_fuse_soc;
+			break;
 #endif
 		default:
 			return dev_err_probe(&pdev->dev, -EINVAL, "Unsupported SoC: %02x\n", chip);
diff --git a/drivers/soc/tegra/fuse/fuse-tegra30.c b/drivers/soc/tegra/fuse/fuse-tegra30.c
index e94d46372a63..34fcc23a6449 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra30.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra30.c
@@ -678,3 +678,23 @@ const struct tegra_fuse_soc tegra234_fuse_soc = {
 	.clk_suspend_on = false,
 };
 #endif
+
+#if defined(CONFIG_ARCH_TEGRA_241_SOC)
+static const struct tegra_fuse_info tegra241_fuse_info = {
+	.read = tegra30_fuse_read,
+	.size = 0x16008,
+	.spare = 0xcf0,
+};
+
+static const struct nvmem_keepout tegra241_fuse_keepouts[] = {
+	{ .start = 0xc, .end = 0x1600c }
+};
+
+const struct tegra_fuse_soc tegra241_fuse_soc = {
+	.init = tegra30_fuse_init,
+	.info = &tegra241_fuse_info,
+	.keepouts = tegra241_fuse_keepouts,
+	.num_keepouts = ARRAY_SIZE(tegra241_fuse_keepouts),
+	.soc_attr_group = &tegra194_soc_attr_group,
+};
+#endif
diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
index a41e9f85281a..f3b705327c20 100644
--- a/drivers/soc/tegra/fuse/fuse.h
+++ b/drivers/soc/tegra/fuse/fuse.h
@@ -136,4 +136,8 @@ extern const struct tegra_fuse_soc tegra194_fuse_soc;
 extern const struct tegra_fuse_soc tegra234_fuse_soc;
 #endif
 
+#ifdef CONFIG_ARCH_TEGRA_241_SOC
+extern const struct tegra_fuse_soc tegra241_fuse_soc;
+#endif
+
 #endif
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index e2ca93de6c1f..c72bdb3e4e2c 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -64,6 +64,7 @@ bool tegra_is_silicon(void)
 	switch (tegra_get_chip_id()) {
 	case TEGRA194:
 	case TEGRA234:
+	case TEGRA241:
 	case TEGRA264:
 		if (tegra_get_platform() == 0)
 			return true;
diff --git a/include/soc/tegra/fuse.h b/include/soc/tegra/fuse.h
index 3a513be50243..8f421b9f7585 100644
--- a/include/soc/tegra/fuse.h
+++ b/include/soc/tegra/fuse.h
@@ -17,6 +17,7 @@
 #define TEGRA186	0x18
 #define TEGRA194	0x19
 #define TEGRA234	0x23
+#define TEGRA241	0x24
 #define TEGRA264	0x26
 
 #define TEGRA_FUSE_SKU_CALIB_0	0xf0
-- 
2.34.1