Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
information such as the SoC revision.
Usage example:
# grep . /sys/devices/soc0/*
/sys/devices/soc0/family:Nuvoton NPCM
/sys/devices/soc0/revision:A3
/sys/devices/soc0/soc_id:WPCM450
Signed-off-by: Jonathan Neuschäfer <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
---
v6:
- Select REGMAP
- Rearrange Kconfig structure a bit
v5:
- Change Kconfig option from bool to tristate
v4:
- rebase on 5.19-rc1
v3:
- Declare revisions array as static
- Change get_revision parameter to `unsigned int`
- Add Paul's R-b tag
- Add usage example
- Sort includes
v2:
- https://lore.kernel.org/lkml/[email protected]/
- Add R-b tag
- rebase on 5.18-rc1
v1:
- https://lore.kernel.org/lkml/[email protected]/
---
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/nuvoton/Kconfig | 17 +++++
drivers/soc/nuvoton/Makefile | 2 +
drivers/soc/nuvoton/wpcm450-soc.c | 109 ++++++++++++++++++++++++++++++
5 files changed, 130 insertions(+)
create mode 100644 drivers/soc/nuvoton/Kconfig
create mode 100644 drivers/soc/nuvoton/Makefile
create mode 100644 drivers/soc/nuvoton/wpcm450-soc.c
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index e461c071189b4..f17764a7e5884 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -15,6 +15,7 @@ source "drivers/soc/ixp4xx/Kconfig"
source "drivers/soc/litex/Kconfig"
source "drivers/soc/mediatek/Kconfig"
source "drivers/soc/microchip/Kconfig"
+source "drivers/soc/nuvoton/Kconfig"
source "drivers/soc/pxa/Kconfig"
source "drivers/soc/qcom/Kconfig"
source "drivers/soc/renesas/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 69ba6508cf2c1..9f92506854852 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SOC_XWAY) += lantiq/
obj-$(CONFIG_LITEX_SOC_CONTROLLER) += litex/
obj-y += mediatek/
obj-y += microchip/
+obj-y += nuvoton/
obj-y += pxa/
obj-y += amlogic/
obj-y += qcom/
diff --git a/drivers/soc/nuvoton/Kconfig b/drivers/soc/nuvoton/Kconfig
new file mode 100644
index 0000000000000..2167d3d739d84
--- /dev/null
+++ b/drivers/soc/nuvoton/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+menu "Nuvoton SoC drivers"
+ depends on ARCH_NPCM || COMPILE_TEST
+
+config WPCM450_SOC
+ tristate "Nuvoton WPCM450 SoC driver"
+ default y if ARCH_WPCM450
+ select SOC_BUS
+ select REGMAP
+ help
+ Say Y here to compile the SoC information driver for Nuvoton
+ WPCM450 SoCs.
+
+ This driver provides information such as the SoC model and
+ revision.
+
+endmenu
diff --git a/drivers/soc/nuvoton/Makefile b/drivers/soc/nuvoton/Makefile
new file mode 100644
index 0000000000000..e30317b4e8290
--- /dev/null
+++ b/drivers/soc/nuvoton/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_WPCM450_SOC) += wpcm450-soc.o
diff --git a/drivers/soc/nuvoton/wpcm450-soc.c b/drivers/soc/nuvoton/wpcm450-soc.c
new file mode 100644
index 0000000000000..c5e0d11c383b1
--- /dev/null
+++ b/drivers/soc/nuvoton/wpcm450-soc.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton WPCM450 SoC Identification
+ *
+ * Copyright (C) 2022 Jonathan Neuschäfer
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#define GCR_PDID 0
+#define PDID_CHIP(x) ((x) & 0x00ffffff)
+#define CHIP_WPCM450 0x926450
+#define PDID_REV(x) ((x) >> 24)
+
+struct revision {
+ u8 number;
+ const char *name;
+};
+
+static const struct revision revisions[] __initconst = {
+ { 0x00, "Z1" },
+ { 0x03, "Z2" },
+ { 0x04, "Z21" },
+ { 0x08, "A1" },
+ { 0x09, "A2" },
+ { 0x0a, "A3" },
+ {}
+};
+
+static const char * __init get_revision(unsigned int rev)
+{
+ int i;
+
+ for (i = 0; revisions[i].name; i++)
+ if (revisions[i].number == rev)
+ return revisions[i].name;
+ return NULL;
+}
+
+static struct soc_device_attribute *wpcm450_attr;
+static struct soc_device *wpcm450_soc;
+
+static int __init wpcm450_soc_init(void)
+{
+ struct soc_device_attribute *attr;
+ struct soc_device *soc;
+ const char *revision;
+ struct regmap *gcr;
+ u32 pdid;
+ int ret;
+
+ if (!of_machine_is_compatible("nuvoton,wpcm450"))
+ return 0;
+
+ gcr = syscon_regmap_lookup_by_compatible("nuvoton,wpcm450-gcr");
+ if (IS_ERR(gcr))
+ return PTR_ERR(gcr);
+ ret = regmap_read(gcr, GCR_PDID, &pdid);
+ if (ret)
+ return ret;
+
+ if (PDID_CHIP(pdid) != CHIP_WPCM450) {
+ pr_warn("Unknown chip ID in GCR.PDID: 0x%06x\n", PDID_CHIP(pdid));
+ return -ENODEV;
+ }
+
+ revision = get_revision(PDID_REV(pdid));
+ if (!revision) {
+ pr_warn("Unknown chip revision in GCR.PDID: 0x%02x\n", PDID_REV(pdid));
+ return -ENODEV;
+ }
+
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->family = "Nuvoton NPCM";
+ attr->soc_id = "WPCM450";
+ attr->revision = revision;
+ soc = soc_device_register(attr);
+ if (IS_ERR(soc)) {
+ kfree(attr);
+ pr_warn("Could not register SoC device\n");
+ return PTR_ERR(soc);
+ }
+
+ wpcm450_soc = soc;
+ wpcm450_attr = attr;
+ return 0;
+}
+module_init(wpcm450_soc_init);
+
+static void __exit wpcm450_soc_exit(void)
+{
+ if (wpcm450_soc) {
+ soc_device_unregister(wpcm450_soc);
+ wpcm450_soc = NULL;
+ kfree(wpcm450_attr);
+ }
+}
+module_exit(wpcm450_soc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonathan Neuschäfer");
+MODULE_DESCRIPTION("Nuvoton WPCM450 SoC Identification driver");
--
2.35.1
Hi Jonathan,
On Thu, Nov 3, 2022 at 10:37 PM Jonathan Neuschäfer
<[email protected]> wrote:
> Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
> information such as the SoC revision.
>
> Usage example:
>
> # grep . /sys/devices/soc0/*
> /sys/devices/soc0/family:Nuvoton NPCM
> /sys/devices/soc0/revision:A3
> /sys/devices/soc0/soc_id:WPCM450
>
> Signed-off-by: Jonathan Neuschäfer <[email protected]>
> Reviewed-by: Joel Stanley <[email protected]>
> Reviewed-by: Paul Menzel <[email protected]>
> ---
> v6:
> - Select REGMAP
> - Rearrange Kconfig structure a bit
Thanks for your patch!
Unfortunately Joel seems to have sent v5 to Arnd instead of v6?
https://lore.kernel.org/all/[email protected]
Which is now commit 7dbb4a38bff34493 ("soc:
nuvoton: Add SoC info driver for WPCM450") in soc/for-next...
> --- /dev/null
> +++ b/drivers/soc/nuvoton/Kconfig
> @@ -0,0 +1,17 @@
> +# SPDX-License-Identifier: GPL-2.0
> +menu "Nuvoton SoC drivers"
> + depends on ARCH_NPCM || COMPILE_TEST
... and lacks the above dependency, hence appearing on my radar.
> +
> +config WPCM450_SOC
> + tristate "Nuvoton WPCM450 SoC driver"
> + default y if ARCH_WPCM450
> + select SOC_BUS
> + select REGMAP
> + help
> + Say Y here to compile the SoC information driver for Nuvoton
> + WPCM450 SoCs.
> +
> + This driver provides information such as the SoC model and
> + revision.
> +
> +endmenu
Do you plan to send a follow-up patch?
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
On Fri, Feb 10, 2023 at 11:26:28AM +0100, Geert Uytterhoeven wrote:
> Hi Jonathan,
>
> On Thu, Nov 3, 2022 at 10:37 PM Jonathan Neuschäfer
> <[email protected]> wrote:
> > Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
> > information such as the SoC revision.
> >
> > Usage example:
> >
> > # grep . /sys/devices/soc0/*
> > /sys/devices/soc0/family:Nuvoton NPCM
> > /sys/devices/soc0/revision:A3
> > /sys/devices/soc0/soc_id:WPCM450
> >
> > Signed-off-by: Jonathan Neuschäfer <[email protected]>
> > Reviewed-by: Joel Stanley <[email protected]>
> > Reviewed-by: Paul Menzel <[email protected]>
> > ---
> > v6:
> > - Select REGMAP
> > - Rearrange Kconfig structure a bit
>
> Thanks for your patch!
>
> Unfortunately Joel seems to have sent v5 to Arnd instead of v6?
> https://lore.kernel.org/all/[email protected]
>
> Which is now commit 7dbb4a38bff34493 ("soc:
> nuvoton: Add SoC info driver for WPCM450") in soc/for-next...
>
> > --- /dev/null
> > +++ b/drivers/soc/nuvoton/Kconfig
> > @@ -0,0 +1,17 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +menu "Nuvoton SoC drivers"
> > + depends on ARCH_NPCM || COMPILE_TEST
>
> ... and lacks the above dependency, hence appearing on my radar.
>
> > +
> > +config WPCM450_SOC
> > + tristate "Nuvoton WPCM450 SoC driver"
> > + default y if ARCH_WPCM450
> > + select SOC_BUS
> > + select REGMAP
> > + help
> > + Say Y here to compile the SoC information driver for Nuvoton
> > + WPCM450 SoCs.
> > +
> > + This driver provides information such as the SoC model and
> > + revision.
> > +
> > +endmenu
>
> Do you plan to send a follow-up patch?
Yes, hopefully I'll get around to it a few days after rc1, when the dust
of the (upcoming) merge window has settled a bit.
Or should I rather send it earlier?
Jonathan
> Thanks!
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
Hi Jonathan,
On Sat, Feb 11, 2023 at 2:03 AM Jonathan Neuschäfer
<[email protected]> wrote:
> On Fri, Feb 10, 2023 at 11:26:28AM +0100, Geert Uytterhoeven wrote:
> > On Thu, Nov 3, 2022 at 10:37 PM Jonathan Neuschäfer
> > <[email protected]> wrote:
> > > Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
> > > information such as the SoC revision.
> > >
> > > Usage example:
> > >
> > > # grep . /sys/devices/soc0/*
> > > /sys/devices/soc0/family:Nuvoton NPCM
> > > /sys/devices/soc0/revision:A3
> > > /sys/devices/soc0/soc_id:WPCM450
> > >
> > > Signed-off-by: Jonathan Neuschäfer <[email protected]>
> > > Reviewed-by: Joel Stanley <[email protected]>
> > > Reviewed-by: Paul Menzel <[email protected]>
> > > ---
> > > v6:
> > > - Select REGMAP
> > > - Rearrange Kconfig structure a bit
> >
> > Thanks for your patch!
> >
> > Unfortunately Joel seems to have sent v5 to Arnd instead of v6?
> > https://lore.kernel.org/all/[email protected]
> >
> > Which is now commit 7dbb4a38bff34493 ("soc:
> > nuvoton: Add SoC info driver for WPCM450") in soc/for-next...
> >
> > > --- /dev/null
> > > +++ b/drivers/soc/nuvoton/Kconfig
> > > @@ -0,0 +1,17 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > > +menu "Nuvoton SoC drivers"
> > > + depends on ARCH_NPCM || COMPILE_TEST
> >
> > ... and lacks the above dependency, hence appearing on my radar.
> >
> > > +
> > > +config WPCM450_SOC
> > > + tristate "Nuvoton WPCM450 SoC driver"
> > > + default y if ARCH_WPCM450
> > > + select SOC_BUS
> > > + select REGMAP
> > > + help
> > > + Say Y here to compile the SoC information driver for Nuvoton
> > > + WPCM450 SoCs.
> > > +
> > > + This driver provides information such as the SoC model and
> > > + revision.
> > > +
> > > +endmenu
> >
> > Do you plan to send a follow-up patch?
>
> Yes, hopefully I'll get around to it a few days after rc1, when the dust
> of the (upcoming) merge window has settled a bit.
>
> Or should I rather send it earlier?
I'd say sooner rather than later.
If I hadn't found your v6, I would have sent a patch myself to add the
dependency.
Does the "select REGMAP" fix a build issue? If yes, that's a very good
reason to send it now...
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
On Sat, Feb 11, 2023 at 10:33:05AM +0100, Geert Uytterhoeven wrote:
> Hi Jonathan,
>
> On Sat, Feb 11, 2023 at 2:03 AM Jonathan Neuschäfer
> <[email protected]> wrote:
> > On Fri, Feb 10, 2023 at 11:26:28AM +0100, Geert Uytterhoeven wrote:
> > > On Thu, Nov 3, 2022 at 10:37 PM Jonathan Neuschäfer
> > > <[email protected]> wrote:
> > > > Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
> > > > information such as the SoC revision.
[...]
> > > > +config WPCM450_SOC
> > > > + tristate "Nuvoton WPCM450 SoC driver"
> > > > + default y if ARCH_WPCM450
> > > > + select SOC_BUS
> > > > + select REGMAP
> > > > + help
> > > > + Say Y here to compile the SoC information driver for Nuvoton
> > > > + WPCM450 SoCs.
> > > > +
> > > > + This driver provides information such as the SoC model and
> > > > + revision.
> > > > +
> > > > +endmenu
> > >
> > > Do you plan to send a follow-up patch?
> >
> > Yes, hopefully I'll get around to it a few days after rc1, when the dust
> > of the (upcoming) merge window has settled a bit.
> >
> > Or should I rather send it earlier?
>
> I'd say sooner rather than later.
> If I hadn't found your v6, I would have sent a patch myself to add the
> dependency.
Ok, I'll send it today.
>
> Does the "select REGMAP" fix a build issue? If yes, that's a very good
> reason to send it now...
Unfortunately I wasn't able to find the build issue report.
Jonathan