[PATCH v2 0/3] soc: samsung: exynos-chipid: be a module!

[PATCH v2 0/3] soc: samsung: exynos-chipid: be a module!

[Krzysztof Kozlowski]

Hi,

Changes since v1
================
1. Drop patch 1/2 - exporting soc_device_to_device
2. Add new patches: 1/3 and 3/3.

Question
========

A question - what is the convention for naming modules: underscores '_' or
hyphens '-'?

The C-unit file already uses a hyphen "exynos-chipid.c", so I could
create a module named:
1. exynos_chipid
2. soc-exynos-chipid
3. exynos-chip-id

The Linux device name is "exynos-chipid".

Best regards,
Krzysztof


Krzysztof Kozlowski (3):
  soc: samsung: exynos-chipid: avoid soc_device_to_device()
  soc: samsung: exynos-chipid: convert to a module
  soc: samsung: exynos-chipid: do not enforce built-in

 arch/arm/mach-exynos/Kconfig         |  1 -
 drivers/soc/samsung/Kconfig          |  4 +++-
 drivers/soc/samsung/Makefile         |  3 ++-
 drivers/soc/samsung/exynos-chipid.c  | 14 +++++++++++---
 drivers/soc/samsung/exynos5422-asv.c |  1 +
 5 files changed, 17 insertions(+), 6 deletions(-)

-- 
2.30.2

[PATCH v2 1/3] soc: samsung: exynos-chipid: avoid soc_device_to_device()

[Krzysztof Kozlowski]

soc_device_to_device() seems to be discouraged [1] so remove it in favor
of printing info message with platform device.  This will only change
the prefix in theh info message from "soc soc0: " to "exynos-chipid
10000000.chipid:".

[1] https://lore.kernel.org/lkml/20191111052741.GB3176397@kroah.com/

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/soc/samsung/exynos-chipid.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
index 5c1d0f97f766..dcd9a08ce706 100644
--- a/drivers/soc/samsung/exynos-chipid.c
+++ b/drivers/soc/samsung/exynos-chipid.c
@@ -104,8 +104,7 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, soc_dev);
 
-	dev_info(soc_device_to_device(soc_dev),
-		 "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
+	dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
 		 soc_dev_attr->soc_id, product_id, revision);
 
 	return 0;
-- 
2.30.2

[PATCH v2 2/3] soc: samsung: exynos-chipid: convert to a module

[Krzysztof Kozlowski]

Exynos ChipID and ASV (Adaptive Supply Voltage) driver is not essential
to system boot and it can successfully be built and loaded as module.

This makes core kernel image smaller and reduces the memory footprint
when multi-platform kernel is booted on non-Exynos board.  Usually it is
also distro-friendly.

Add multiple authors of the driver since its conversion from
mach-exynos, ordered alphabetically by first name.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/soc/samsung/Kconfig          |  3 ++-
 drivers/soc/samsung/Makefile         |  3 ++-
 drivers/soc/samsung/exynos-chipid.c  | 11 ++++++++++-
 drivers/soc/samsung/exynos5422-asv.c |  1 +
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
index 1f643c0f5c93..fe139f26d093 100644
--- a/drivers/soc/samsung/Kconfig
+++ b/drivers/soc/samsung/Kconfig
@@ -13,13 +13,14 @@ config EXYNOS_ASV_ARM
 	depends on EXYNOS_CHIPID
 
 config EXYNOS_CHIPID
-	bool "Exynos ChipID controller and ASV driver" if COMPILE_TEST
+	tristate "Exynos ChipID controller and ASV driver" if COMPILE_TEST
 	depends on ARCH_EXYNOS || COMPILE_TEST
 	select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
 	select MFD_SYSCON
 	select SOC_BUS
 	help
 	  Support for Samsung Exynos SoC ChipID and Adaptive Supply Voltage.
+	  This driver can also be built as module (exynos_chipid).
 
 config EXYNOS_PMU
 	bool "Exynos PMU controller driver" if COMPILE_TEST
diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
index 0c523a8de4eb..2ae4bea804cf 100644
--- a/drivers/soc/samsung/Makefile
+++ b/drivers/soc/samsung/Makefile
@@ -1,8 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_EXYNOS_ASV_ARM)	+= exynos5422-asv.o
+obj-$(CONFIG_EXYNOS_CHIPID)	+= exynos_chipid.o
+exynos_chipid-y			+= exynos-chipid.o exynos-asv.o
 
-obj-$(CONFIG_EXYNOS_CHIPID)	+= exynos-chipid.o exynos-asv.o
 obj-$(CONFIG_EXYNOS_PMU)	+= exynos-pmu.o
 
 obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS)	+= exynos3250-pmu.o exynos4-pmu.o \
diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
index dcd9a08ce706..b2627a3a127a 100644
--- a/drivers/soc/samsung/exynos-chipid.c
+++ b/drivers/soc/samsung/exynos-chipid.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -128,6 +129,7 @@ static const struct of_device_id exynos_chipid_of_device_ids[] = {
 	{ .compatible = "samsung,exynos4210-chipid" },
 	{}
 };
+MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
 
 static struct platform_driver exynos_chipid_driver = {
 	.driver = {
@@ -137,4 +139,11 @@ static struct platform_driver exynos_chipid_driver = {
 	.probe	= exynos_chipid_probe,
 	.remove	= exynos_chipid_remove,
 };
-builtin_platform_driver(exynos_chipid_driver);
+module_platform_driver(exynos_chipid_driver);
+
+MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
+MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
+MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/soc/samsung/exynos5422-asv.c b/drivers/soc/samsung/exynos5422-asv.c
index ca409a976e34..475ae5276529 100644
--- a/drivers/soc/samsung/exynos5422-asv.c
+++ b/drivers/soc/samsung/exynos5422-asv.c
@@ -503,3 +503,4 @@ int exynos5422_asv_init(struct exynos_asv *asv)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(exynos5422_asv_init);
-- 
2.30.2

[PATCH v2 3/3] soc: samsung: exynos-chipid: do not enforce built-in

[Krzysztof Kozlowski]

After converting the Exynos ChipID and ASV driver to a module, allow to
actually choose it to be a module, while being a default built-in.  The
side effect is that driver could be now entirely disabled even for
kernel with ARCH_EXYNOS, but this is not a critical issue because driver
is not necessary for the proper platform boot.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 arch/arm/mach-exynos/Kconfig | 1 -
 drivers/soc/samsung/Kconfig  | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 5a48abac6af4..30f930e20599 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -13,7 +13,6 @@ menuconfig ARCH_EXYNOS
 	select ARM_GIC
 	select EXYNOS_IRQ_COMBINER
 	select COMMON_CLK_SAMSUNG
-	select EXYNOS_CHIPID
 	select EXYNOS_THERMAL
 	select EXYNOS_PMU
 	select EXYNOS_SROM
diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
index fe139f26d093..e2cedef1e8d1 100644
--- a/drivers/soc/samsung/Kconfig
+++ b/drivers/soc/samsung/Kconfig
@@ -13,8 +13,9 @@ config EXYNOS_ASV_ARM
 	depends on EXYNOS_CHIPID
 
 config EXYNOS_CHIPID
-	tristate "Exynos ChipID controller and ASV driver" if COMPILE_TEST
+	tristate "Exynos ChipID controller and ASV driver"
 	depends on ARCH_EXYNOS || COMPILE_TEST
+	default ARCH_EXYNOS
 	select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
 	select MFD_SYSCON
 	select SOC_BUS
-- 
2.30.2

Re: [PATCH v2 0/3] soc: samsung: exynos-chipid: be a module!

[Alim Akhtar]

Hello Krzysztof

On Sun, Sep 19, 2021 at 6:28 PM Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> Hi,
>
> Changes since v1
> ================
> 1. Drop patch 1/2 - exporting soc_device_to_device
> 2. Add new patches: 1/3 and 3/3.
>
> Question
> ========
>
> A question - what is the convention for naming modules: underscores '_' or
> hyphens '-'?
>
> The C-unit file already uses a hyphen "exynos-chipid.c", so I could
> create a module named:
> 1. exynos_chipid
> 2. soc-exynos-chipid
> 3. exynos-chip-id
>
> The Linux device name is "exynos-chipid".
>
> Best regards,
> Krzysztof
>
>
> Krzysztof Kozlowski (3):
>   soc: samsung: exynos-chipid: avoid soc_device_to_device()
>   soc: samsung: exynos-chipid: convert to a module
>   soc: samsung: exynos-chipid: do not enforce built-in
>
>  arch/arm/mach-exynos/Kconfig         |  1 -
>  drivers/soc/samsung/Kconfig          |  4 +++-
>  drivers/soc/samsung/Makefile         |  3 ++-
>  drivers/soc/samsung/exynos-chipid.c  | 14 +++++++++++---
>  drivers/soc/samsung/exynos5422-asv.c |  1 +
>  5 files changed, 17 insertions(+), 6 deletions(-)
>
Thanks for the patches. For this series
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>

Also tested on exynos7 based platform, so
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>

> --
> 2.30.2
>


-- 
Regards,
Alim

Re: [PATCH v2 0/3] soc: samsung: exynos-chipid: be a module!

[Sylwester Nawrocki]

On 19.09.2021 11:31, Krzysztof Kozlowski wrote:
> Krzysztof Kozlowski (3):
>    soc: samsung: exynos-chipid: avoid soc_device_to_device()
>    soc: samsung: exynos-chipid: convert to a module
>    soc: samsung: exynos-chipid: do not enforce built-in
> 
>   arch/arm/mach-exynos/Kconfig         |  1 -
>   drivers/soc/samsung/Kconfig          |  4 +++-
>   drivers/soc/samsung/Makefile         |  3 ++-
>   drivers/soc/samsung/exynos-chipid.c  | 14 +++++++++++---
>   drivers/soc/samsung/exynos5422-asv.c |  1 +


For the series:
Reviewed-by: Sylwester Nawrocki <snawrocki@kernel.org>
Tested-by: Sylwester Nawrocki <snawrocki@kernel.org>

I just verified Odroid-XU4 is still booting without the driver
and with the driver as a module. Thanks.

Re: [PATCH v2 0/3] soc: samsung: exynos-chipid: be a module!

[Krzysztof Kozlowski]

On Sun, 19 Sep 2021 11:31:11 +0200, Krzysztof Kozlowski wrote:
> Changes since v1
> ================
> 1. Drop patch 1/2 - exporting soc_device_to_device
> 2. Add new patches: 1/3 and 3/3.
> 
> Question
> ========
> 
> [...]

Applied, thanks!

[1/3] soc: samsung: exynos-chipid: avoid soc_device_to_device()
      commit: d1141886c8d72ad77920e6e4b617d366e6e3ee8a
[2/3] soc: samsung: exynos-chipid: convert to a module
      commit: 1e3e559f8d4e5b4c873414078facb35273ecbf4b
[3/3] soc: samsung: exynos-chipid: do not enforce built-in
      commit: 140bbfe7cd4be0aa6543f94d3994e4774b325abc

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

Re: [PATCH v2 1/3] soc: samsung: exynos-chipid: avoid soc_device_to_device()

[Sam Protsenko]

On Sun, 19 Sept 2021 at 12:31, Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> soc_device_to_device() seems to be discouraged [1] so remove it in favor
> of printing info message with platform device.  This will only change
> the prefix in theh info message from "soc soc0: " to "exynos-chipid
> 10000000.chipid:".
>
> [1] https://lore.kernel.org/lkml/20191111052741.GB3176397@kroah.com/
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

>  drivers/soc/samsung/exynos-chipid.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
> index 5c1d0f97f766..dcd9a08ce706 100644
> --- a/drivers/soc/samsung/exynos-chipid.c
> +++ b/drivers/soc/samsung/exynos-chipid.c
> @@ -104,8 +104,7 @@ static int exynos_chipid_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, soc_dev);
>
> -       dev_info(soc_device_to_device(soc_dev),
> -                "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
> +       dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
>                  soc_dev_attr->soc_id, product_id, revision);
>
>         return 0;
> --
> 2.30.2
>

Re: [PATCH v2 2/3] soc: samsung: exynos-chipid: convert to a module

[Sam Protsenko]

On Sun, 19 Sept 2021 at 12:31, Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> Exynos ChipID and ASV (Adaptive Supply Voltage) driver is not essential
> to system boot and it can successfully be built and loaded as module.
>
> This makes core kernel image smaller and reduces the memory footprint
> when multi-platform kernel is booted on non-Exynos board.  Usually it is
> also distro-friendly.
>
> Add multiple authors of the driver since its conversion from
> mach-exynos, ordered alphabetically by first name.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

>  drivers/soc/samsung/Kconfig          |  3 ++-
>  drivers/soc/samsung/Makefile         |  3 ++-
>  drivers/soc/samsung/exynos-chipid.c  | 11 ++++++++++-
>  drivers/soc/samsung/exynos5422-asv.c |  1 +
>  4 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
> index 1f643c0f5c93..fe139f26d093 100644
> --- a/drivers/soc/samsung/Kconfig
> +++ b/drivers/soc/samsung/Kconfig
> @@ -13,13 +13,14 @@ config EXYNOS_ASV_ARM
>         depends on EXYNOS_CHIPID
>
>  config EXYNOS_CHIPID
> -       bool "Exynos ChipID controller and ASV driver" if COMPILE_TEST
> +       tristate "Exynos ChipID controller and ASV driver" if COMPILE_TEST
>         depends on ARCH_EXYNOS || COMPILE_TEST
>         select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
>         select MFD_SYSCON
>         select SOC_BUS
>         help
>           Support for Samsung Exynos SoC ChipID and Adaptive Supply Voltage.
> +         This driver can also be built as module (exynos_chipid).
>
>  config EXYNOS_PMU
>         bool "Exynos PMU controller driver" if COMPILE_TEST
> diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
> index 0c523a8de4eb..2ae4bea804cf 100644
> --- a/drivers/soc/samsung/Makefile
> +++ b/drivers/soc/samsung/Makefile
> @@ -1,8 +1,9 @@
>  # SPDX-License-Identifier: GPL-2.0
>
>  obj-$(CONFIG_EXYNOS_ASV_ARM)   += exynos5422-asv.o
> +obj-$(CONFIG_EXYNOS_CHIPID)    += exynos_chipid.o
> +exynos_chipid-y                        += exynos-chipid.o exynos-asv.o
>
> -obj-$(CONFIG_EXYNOS_CHIPID)    += exynos-chipid.o exynos-asv.o
>  obj-$(CONFIG_EXYNOS_PMU)       += exynos-pmu.o
>
>  obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS)   += exynos3250-pmu.o exynos4-pmu.o \
> diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
> index dcd9a08ce706..b2627a3a127a 100644
> --- a/drivers/soc/samsung/exynos-chipid.c
> +++ b/drivers/soc/samsung/exynos-chipid.c
> @@ -15,6 +15,7 @@
>  #include <linux/device.h>
>  #include <linux/errno.h>
>  #include <linux/mfd/syscon.h>
> +#include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
> @@ -128,6 +129,7 @@ static const struct of_device_id exynos_chipid_of_device_ids[] = {
>         { .compatible = "samsung,exynos4210-chipid" },
>         {}
>  };
> +MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
>
>  static struct platform_driver exynos_chipid_driver = {
>         .driver = {
> @@ -137,4 +139,11 @@ static struct platform_driver exynos_chipid_driver = {
>         .probe  = exynos_chipid_probe,
>         .remove = exynos_chipid_remove,
>  };
> -builtin_platform_driver(exynos_chipid_driver);
> +module_platform_driver(exynos_chipid_driver);
> +
> +MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
> +MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
> +MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
> +MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
> +MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/soc/samsung/exynos5422-asv.c b/drivers/soc/samsung/exynos5422-asv.c
> index ca409a976e34..475ae5276529 100644
> --- a/drivers/soc/samsung/exynos5422-asv.c
> +++ b/drivers/soc/samsung/exynos5422-asv.c
> @@ -503,3 +503,4 @@ int exynos5422_asv_init(struct exynos_asv *asv)
>
>         return 0;
>  }
> +EXPORT_SYMBOL_GPL(exynos5422_asv_init);
> --
> 2.30.2
>

Re: [PATCH v2 3/3] soc: samsung: exynos-chipid: do not enforce built-in

[Sam Protsenko]

On Sun, 19 Sept 2021 at 12:31, Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> After converting the Exynos ChipID and ASV driver to a module, allow to
> actually choose it to be a module, while being a default built-in.  The
> side effect is that driver could be now entirely disabled even for
> kernel with ARCH_EXYNOS, but this is not a critical issue because driver
> is not necessary for the proper platform boot.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

>  arch/arm/mach-exynos/Kconfig | 1 -
>  drivers/soc/samsung/Kconfig  | 3 ++-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
> index 5a48abac6af4..30f930e20599 100644
> --- a/arch/arm/mach-exynos/Kconfig
> +++ b/arch/arm/mach-exynos/Kconfig
> @@ -13,7 +13,6 @@ menuconfig ARCH_EXYNOS
>         select ARM_GIC
>         select EXYNOS_IRQ_COMBINER
>         select COMMON_CLK_SAMSUNG
> -       select EXYNOS_CHIPID
>         select EXYNOS_THERMAL
>         select EXYNOS_PMU
>         select EXYNOS_SROM
> diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
> index fe139f26d093..e2cedef1e8d1 100644
> --- a/drivers/soc/samsung/Kconfig
> +++ b/drivers/soc/samsung/Kconfig
> @@ -13,8 +13,9 @@ config EXYNOS_ASV_ARM
>         depends on EXYNOS_CHIPID
>
>  config EXYNOS_CHIPID
> -       tristate "Exynos ChipID controller and ASV driver" if COMPILE_TEST
> +       tristate "Exynos ChipID controller and ASV driver"
>         depends on ARCH_EXYNOS || COMPILE_TEST
> +       default ARCH_EXYNOS
>         select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
>         select MFD_SYSCON
>         select SOC_BUS
> --
> 2.30.2
>