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net: wan: framer: Add version sysfs attribute for the Lantiq PEF2256 framer

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Lantiq PEF2256 framer has some little differences in behaviour
depending on its version.

Add a sysfs attribute to allow user applications to know the
version.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://patch.msgid.link/77a27941d6924b1009df0162ed9f0fa07ed6e431.1758726302.git.christophe.leroy@csgroup.eu
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Christophe Leroy
2025-09-24 17:06:47 +02:00
committed by Jakub Kicinski
parent 231889d9b6
commit 0e41b0af47
2 changed files with 27 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/ABI/testing/sysfs-driver-framer-pef2256 Normal file
View File

@@ -0,0 +1,8 @@
What: /sys/bus/platform/devices/xxx/version
Date: Sep 2025
Contact: netdev@vger.kernel.org
Description: Reports the version of the PEF2256 framer
Access: Read
Valid values: Represented as string

24
drivers/net/wan/framer/pef2256/pef2256.c
View File

@@ -37,6 +37,7 @@ struct pef2256 {
struct device *dev;
struct regmap *regmap;
enum pef2256_version version;
const char *version_txt;
struct clk *mclk;
struct clk *sclkr;
struct clk *sclkx;
@@ -114,6 +115,16 @@ enum pef2256_version pef2256_get_version(struct pef2256 *pef2256)
}
EXPORT_SYMBOL_GPL(pef2256_get_version);
static ssize_t version_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pef2256 *pef2256 = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", pef2256->version_txt);
}
static DEVICE_ATTR_RO(version);
enum pef2256_gcm_config_item {
PEF2256_GCM_CONFIG_1544000 = 0,
PEF2256_GCM_CONFIG_2048000,
@@ -697,7 +708,6 @@ static int pef2256_probe(struct platform_device *pdev)
unsigned long sclkr_rate, sclkx_rate;
struct framer_provider *framer_provider;
struct pef2256 *pef2256;
const char *version_txt;
void __iomem *iomem;
int ret;
int irq;
@@ -763,18 +773,18 @@ static int pef2256_probe(struct platform_device *pdev)
pef2256->version = pef2256_get_version(pef2256);
switch (pef2256->version) {
case PEF2256_VERSION_1_2:
version_txt = "1.2";
pef2256->version_txt = "1.2";
break;
case PEF2256_VERSION_2_1:
version_txt = "2.1";
pef2256->version_txt = "2.1";
break;
case PEF2256_VERSION_2_2:
version_txt = "2.2";
pef2256->version_txt = "2.2";
break;
default:
return -ENODEV;
}
dev_info(pef2256->dev, "Version %s detected\n", version_txt);
dev_info(pef2256->dev, "Version %s detected\n", pef2256->version_txt);
ret = pef2556_of_parse(pef2256, np);
if (ret)
@@ -835,6 +845,8 @@ static int pef2256_probe(struct platform_device *pdev)
return ret;
}
device_create_file(pef2256->dev, &dev_attr_version);
return 0;
}
@@ -849,6 +861,8 @@ static void pef2256_remove(struct platform_device *pdev)
pef2256_write8(pef2256, PEF2256_IMR3, 0xff);
pef2256_write8(pef2256, PEF2256_IMR4, 0xff);
pef2256_write8(pef2256, PEF2256_IMR5, 0xff);
device_remove_file(pef2256->dev, &dev_attr_version);
}
static const struct of_device_id pef2256_id_table[] = {