* [PATCH net-next v10 1/4] net: dsa: motorcomm: Move to subdirectory
2026-08-16 19:38 [PATCH net-next v10 0/4] net: dsa: motorcomm: Add LED support David Yang
@ 2026-08-16 19:38 ` David Yang
2026-08-16 19:38 ` [PATCH net-next v10 2/4] net: dsa: motorcomm: Split SMI module David Yang
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: David Yang @ 2026-08-16 19:38 UTC (permalink / raw)
To: netdev
Cc: David Yang, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, devicetree, linux-kernel
yt921x is already the longest single-file DSA driver, so it's time to
split it into parts.
Signed-off-by: David Yang <mmyangfl@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
MAINTAINERS | 2 +-
drivers/net/dsa/Kconfig | 10 ++--------
drivers/net/dsa/Makefile | 2 +-
drivers/net/dsa/motorcomm/Kconfig | 8 ++++++++
drivers/net/dsa/motorcomm/Makefile | 3 +++
drivers/net/dsa/{yt921x.c => motorcomm/chip.c} | 2 +-
drivers/net/dsa/{yt921x.h => motorcomm/chip.h} | 0
7 files changed, 16 insertions(+), 11 deletions(-)
create mode 100644 drivers/net/dsa/motorcomm/Kconfig
create mode 100644 drivers/net/dsa/motorcomm/Makefile
rename drivers/net/dsa/{yt921x.c => motorcomm/chip.c} (99%)
rename drivers/net/dsa/{yt921x.h => motorcomm/chip.h} (100%)
diff --git a/MAINTAINERS b/MAINTAINERS
index 991460050da7..55cc5ac0e86f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18256,7 +18256,7 @@ M: David Yang <mmyangfl@gmail.com>
L: netdev@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml
-F: drivers/net/dsa/yt921x.*
+F: drivers/net/dsa/motorcomm/
F: net/dsa/tag_yt921x.c
MOXA SMARTIO/INDUSTIO/INTELLIO SERIAL CARD
diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index 4ab567c5bbaf..98e9bbe47de7 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -72,6 +72,8 @@ config NET_DSA_MV88E6060
source "drivers/net/dsa/microchip/Kconfig"
+source "drivers/net/dsa/motorcomm/Kconfig"
+
source "drivers/net/dsa/mv88e6xxx/Kconfig"
source "drivers/net/dsa/mxl862xx/Kconfig"
@@ -158,12 +160,4 @@ config NET_DSA_VITESSE_VSC73XX_PLATFORM
This enables support for the Vitesse VSC7385, VSC7388, VSC7395
and VSC7398 SparX integrated ethernet switches, connected over
a CPU-attached address bus and work in memory-mapped I/O mode.
-
-config NET_DSA_YT921X
- tristate "Motorcomm YT9215 ethernet switch chip support"
- select NET_DSA_TAG_YT921X
- select NET_IEEE8021Q_HELPERS if DCB
- help
- This enables support for the Motorcomm YT9215 ethernet switch
- chip.
endmenu
diff --git a/drivers/net/dsa/Makefile b/drivers/net/dsa/Makefile
index d2975badffc0..138225baa4d5 100644
--- a/drivers/net/dsa/Makefile
+++ b/drivers/net/dsa/Makefile
@@ -14,11 +14,11 @@ obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX) += vitesse-vsc73xx-core.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_PLATFORM) += vitesse-vsc73xx-platform.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_SPI) += vitesse-vsc73xx-spi.o
-obj-$(CONFIG_NET_DSA_YT921X) += yt921x.o
obj-y += b53/
obj-y += hirschmann/
obj-y += lantiq/
obj-y += microchip/
+obj-y += motorcomm/
obj-y += mv88e6xxx/
obj-y += mxl862xx/
obj-y += netc/
diff --git a/drivers/net/dsa/motorcomm/Kconfig b/drivers/net/dsa/motorcomm/Kconfig
new file mode 100644
index 000000000000..1fddd386f866
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/Kconfig
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: ISC
+config NET_DSA_YT921X
+ tristate "Motorcomm YT9215 ethernet switch chip support"
+ select NET_DSA_TAG_YT921X
+ select NET_IEEE8021Q_HELPERS if DCB
+ help
+ This enables support for the Motorcomm YT9215 ethernet switch
+ chip.
diff --git a/drivers/net/dsa/motorcomm/Makefile b/drivers/net/dsa/motorcomm/Makefile
new file mode 100644
index 000000000000..afd03be9fa35
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: ISC
+obj-$(CONFIG_NET_DSA_YT921X) += yt921x.o
+yt921x-objs := chip.o
diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/motorcomm/chip.c
similarity index 99%
rename from drivers/net/dsa/yt921x.c
rename to drivers/net/dsa/motorcomm/chip.c
index 159b16606f6c..f070732845eb 100644
--- a/drivers/net/dsa/yt921x.c
+++ b/drivers/net/dsa/motorcomm/chip.c
@@ -26,7 +26,7 @@
#include <net/ieee8021q.h>
#include <net/pkt_cls.h>
-#include "yt921x.h"
+#include "chip.h"
struct yt921x_mib_desc {
unsigned int size;
diff --git a/drivers/net/dsa/yt921x.h b/drivers/net/dsa/motorcomm/chip.h
similarity index 100%
rename from drivers/net/dsa/yt921x.h
rename to drivers/net/dsa/motorcomm/chip.h
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH net-next v10 2/4] net: dsa: motorcomm: Split SMI module
2026-08-16 19:38 [PATCH net-next v10 0/4] net: dsa: motorcomm: Add LED support David Yang
2026-08-16 19:38 ` [PATCH net-next v10 1/4] net: dsa: motorcomm: Move to subdirectory David Yang
@ 2026-08-16 19:38 ` David Yang
2026-08-16 19:38 ` [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support David Yang
2026-08-16 19:38 ` [PATCH net-next v10 4/4] dt-bindings: net: dsa: yt921x: Add LEDs definition example David Yang
3 siblings, 0 replies; 6+ messages in thread
From: David Yang @ 2026-08-16 19:38 UTC (permalink / raw)
To: netdev
Cc: David Yang, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, devicetree, linux-kernel
SMI operations are going to be used across different modules. Minor
changes are applied to fix build errors.
Signed-off-by: David Yang <mmyangfl@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/dsa/motorcomm/Makefile | 1 +
drivers/net/dsa/motorcomm/chip.c | 207 +----------------------------
drivers/net/dsa/motorcomm/smi.c | 157 ++++++++++++++++++++++
drivers/net/dsa/motorcomm/smi.h | 92 +++++++++++++
4 files changed, 251 insertions(+), 206 deletions(-)
create mode 100644 drivers/net/dsa/motorcomm/smi.c
create mode 100644 drivers/net/dsa/motorcomm/smi.h
diff --git a/drivers/net/dsa/motorcomm/Makefile b/drivers/net/dsa/motorcomm/Makefile
index afd03be9fa35..6cea5313a444 100644
--- a/drivers/net/dsa/motorcomm/Makefile
+++ b/drivers/net/dsa/motorcomm/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: ISC
obj-$(CONFIG_NET_DSA_YT921X) += yt921x.o
yt921x-objs := chip.o
+yt921x-objs += smi.o
diff --git a/drivers/net/dsa/motorcomm/chip.c b/drivers/net/dsa/motorcomm/chip.c
index f070732845eb..6dee25b6754a 100644
--- a/drivers/net/dsa/motorcomm/chip.c
+++ b/drivers/net/dsa/motorcomm/chip.c
@@ -13,7 +13,6 @@
#include <linux/if_bridge.h>
#include <linux/if_hsr.h>
#include <linux/if_vlan.h>
-#include <linux/iopoll.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -27,6 +26,7 @@
#include <net/pkt_cls.h>
#include "chip.h"
+#include "smi.h"
struct yt921x_mib_desc {
unsigned int size;
@@ -155,9 +155,6 @@ static const struct yt921x_info yt921x_infos[] = {
#define YT921X_VID_UNWARE 4095
-#define YT921X_POLL_SLEEP_US 10000
-#define YT921X_POLL_TIMEOUT_US 100000
-
/* The interval should be small enough to avoid overflow of 32bit MIBs.
*
* Until we can read MIBs from stats64 call directly (i.e. sleep
@@ -196,208 +193,6 @@ static u32 ethaddr_lo2_to_u32(const unsigned char *addr)
return (addr[4] << 8) | addr[5];
}
-static int yt921x_reg_read(struct yt921x_priv *priv, u32 reg, u32 *valp)
-{
- WARN_ON(!mutex_is_locked(&priv->reg_lock));
-
- return priv->reg_ops->read(priv->reg_ctx, reg, valp);
-}
-
-static int yt921x_reg_write(struct yt921x_priv *priv, u32 reg, u32 val)
-{
- WARN_ON(!mutex_is_locked(&priv->reg_lock));
-
- return priv->reg_ops->write(priv->reg_ctx, reg, val);
-}
-
-static int
-yt921x_reg_wait(struct yt921x_priv *priv, u32 reg, u32 mask, u32 *valp)
-{
- u32 val;
- int res;
- int ret;
-
- ret = read_poll_timeout(yt921x_reg_read, res,
- res || (val & mask) == *valp,
- YT921X_POLL_SLEEP_US, YT921X_POLL_TIMEOUT_US,
- false, priv, reg, &val);
- if (ret)
- return ret;
- if (res)
- return res;
-
- *valp = val;
- return 0;
-}
-
-static int
-yt921x_reg_update_bits(struct yt921x_priv *priv, u32 reg, u32 mask, u32 val)
-{
- int res;
- u32 v;
- u32 u;
-
- res = yt921x_reg_read(priv, reg, &v);
- if (res)
- return res;
-
- u = v;
- u &= ~mask;
- u |= val;
- if (u == v)
- return 0;
-
- return yt921x_reg_write(priv, reg, u);
-}
-
-static int yt921x_reg_set_bits(struct yt921x_priv *priv, u32 reg, u32 mask)
-{
- return yt921x_reg_update_bits(priv, reg, 0, mask);
-}
-
-static int yt921x_reg_clear_bits(struct yt921x_priv *priv, u32 reg, u32 mask)
-{
- return yt921x_reg_update_bits(priv, reg, mask, 0);
-}
-
-static int
-yt921x_reg_toggle_bits(struct yt921x_priv *priv, u32 reg, u32 mask, bool set)
-{
- return yt921x_reg_update_bits(priv, reg, mask, !set ? 0 : mask);
-}
-
-/* Some multi-word registers, like VLANn_CTRL, should be treated as a single
- * long register. More specifically, writes to parts of its words won't become
- * visible, until the last word is written.
- *
- * Here we require full read and write operations over these registers to
- * eliminate potential issues, although partial reads/writes are also possible.
- */
-
-static void update_ctrls_unaligned(u32 *lo, u32 *hi, u64 mask, u64 val)
-{
- *lo &= ~lower_32_bits(mask);
- *hi &= ~upper_32_bits(mask);
- *lo |= lower_32_bits(val);
- *hi |= upper_32_bits(val);
-}
-
-static int
-yt921x_regs_read(struct yt921x_priv *priv, u32 reg, u32 *vals,
- unsigned int num_regs)
-{
- int res;
-
- for (unsigned int i = 0; i < num_regs; i++) {
- res = yt921x_reg_read(priv, reg + 4 * i, &vals[i]);
- if (res)
- return res;
- }
-
- return 0;
-}
-
-static int
-yt921x_regs_write(struct yt921x_priv *priv, u32 reg, const u32 *vals,
- unsigned int num_regs)
-{
- int res;
-
- for (unsigned int i = 0; i < num_regs; i++) {
- res = yt921x_reg_write(priv, reg + 4 * i, vals[i]);
- if (res)
- return res;
- }
-
- return 0;
-}
-
-static int
-yt921x_regs_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
- const u32 *vals, unsigned int num_regs)
-{
- bool changed = false;
- u32 vs[4];
- int res;
-
- BUILD_BUG_ON(num_regs > ARRAY_SIZE(vs));
-
- res = yt921x_regs_read(priv, reg, vs, num_regs);
- if (res)
- return res;
-
- for (unsigned int i = 0; i < num_regs; i++) {
- u32 u = vs[i];
-
- u &= ~masks[i];
- u |= vals[i];
- if (u != vs[i])
- changed = true;
-
- vs[i] = u;
- }
-
- if (!changed)
- return 0;
-
- return yt921x_regs_write(priv, reg, vs, num_regs);
-}
-
-static int
-yt921x_regs_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
- unsigned int num_regs)
-{
- bool changed = false;
- u32 vs[4];
- int res;
-
- BUILD_BUG_ON(num_regs > ARRAY_SIZE(vs));
-
- res = yt921x_regs_read(priv, reg, vs, num_regs);
- if (res)
- return res;
-
- for (unsigned int i = 0; i < num_regs; i++) {
- u32 u = vs[i];
-
- u &= ~masks[i];
- if (u != vs[i])
- changed = true;
-
- vs[i] = u;
- }
-
- if (!changed)
- return 0;
-
- return yt921x_regs_write(priv, reg, vs, num_regs);
-}
-
-static int
-yt921x_reg64_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
-{
- return yt921x_regs_write(priv, reg, vals, 2);
-}
-
-static int
-yt921x_reg64_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
- const u32 *vals)
-{
- return yt921x_regs_update_bits(priv, reg, masks, vals, 2);
-}
-
-static int
-yt921x_reg64_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks)
-{
- return yt921x_regs_clear_bits(priv, reg, masks, 2);
-}
-
-static int
-yt921x_reg96_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
-{
- return yt921x_regs_write(priv, reg, vals, 3);
-}
-
static int yt921x_reg_mdio_read(void *context, u32 reg, u32 *valp)
{
struct yt921x_reg_mdio *mdio = context;
diff --git a/drivers/net/dsa/motorcomm/smi.c b/drivers/net/dsa/motorcomm/smi.c
new file mode 100644
index 000000000000..164c25ef494a
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/smi.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#include <linux/iopoll.h>
+
+#include "chip.h"
+#include "smi.h"
+
+#define YT921X_POLL_SLEEP_US 10000
+#define YT921X_POLL_TIMEOUT_US 100000
+
+int yt921x_reg_read(struct yt921x_priv *priv, u32 reg, u32 *valp)
+{
+ WARN_ON(!mutex_is_locked(&priv->reg_lock));
+
+ return priv->reg_ops->read(priv->reg_ctx, reg, valp);
+}
+
+int yt921x_reg_write(struct yt921x_priv *priv, u32 reg, u32 val)
+{
+ WARN_ON(!mutex_is_locked(&priv->reg_lock));
+
+ return priv->reg_ops->write(priv->reg_ctx, reg, val);
+}
+
+int yt921x_reg_wait(struct yt921x_priv *priv, u32 reg, u32 mask, u32 *valp)
+{
+ u32 val;
+ int res;
+ int ret;
+
+ ret = read_poll_timeout(yt921x_reg_read, res,
+ res || (val & mask) == *valp,
+ YT921X_POLL_SLEEP_US, YT921X_POLL_TIMEOUT_US,
+ false, priv, reg, &val);
+ if (ret)
+ return ret;
+ if (res)
+ return res;
+
+ *valp = val;
+ return 0;
+}
+
+int yt921x_reg_update_bits(struct yt921x_priv *priv, u32 reg, u32 mask, u32 val)
+{
+ int res;
+ u32 v;
+ u32 u;
+
+ res = yt921x_reg_read(priv, reg, &v);
+ if (res)
+ return res;
+
+ u = v;
+ u &= ~mask;
+ u |= val;
+ if (u == v)
+ return 0;
+
+ return yt921x_reg_write(priv, reg, u);
+}
+
+int
+yt921x_regs_read(struct yt921x_priv *priv, u32 reg, u32 *vals,
+ unsigned int num_regs)
+{
+ int res;
+
+ for (unsigned int i = 0; i < num_regs; i++) {
+ res = yt921x_reg_read(priv, reg + 4 * i, &vals[i]);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+int
+yt921x_regs_write(struct yt921x_priv *priv, u32 reg, const u32 *vals,
+ unsigned int num_regs)
+{
+ int res;
+
+ for (unsigned int i = 0; i < num_regs; i++) {
+ res = yt921x_reg_write(priv, reg + 4 * i, vals[i]);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+int
+yt921x_regs_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
+ const u32 *vals, unsigned int num_regs)
+{
+ bool changed = false;
+ u32 vs[4];
+ int res;
+
+ if (WARN_ON_ONCE(num_regs > ARRAY_SIZE(vs)))
+ return -EINVAL;
+
+ res = yt921x_regs_read(priv, reg, vs, num_regs);
+ if (res)
+ return res;
+
+ for (unsigned int i = 0; i < num_regs; i++) {
+ u32 u = vs[i];
+
+ u &= ~masks[i];
+ u |= vals[i];
+ if (u != vs[i])
+ changed = true;
+
+ vs[i] = u;
+ }
+
+ if (!changed)
+ return 0;
+
+ return yt921x_regs_write(priv, reg, vs, num_regs);
+}
+
+int
+yt921x_regs_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
+ unsigned int num_regs)
+{
+ bool changed = false;
+ u32 vs[4];
+ int res;
+
+ if (WARN_ON_ONCE(num_regs > ARRAY_SIZE(vs)))
+ return -EINVAL;
+
+ res = yt921x_regs_read(priv, reg, vs, num_regs);
+ if (res)
+ return res;
+
+ for (unsigned int i = 0; i < num_regs; i++) {
+ u32 u = vs[i];
+
+ u &= ~masks[i];
+ if (u != vs[i])
+ changed = true;
+
+ vs[i] = u;
+ }
+
+ if (!changed)
+ return 0;
+
+ return yt921x_regs_write(priv, reg, vs, num_regs);
+}
diff --git a/drivers/net/dsa/motorcomm/smi.h b/drivers/net/dsa/motorcomm/smi.h
new file mode 100644
index 000000000000..2995e91f3b3d
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/smi.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#ifndef _YT_SMI_H
+#define _YT_SMI_H
+
+#include <linux/types.h>
+#include <linux/wordpart.h>
+
+struct yt921x_priv;
+
+int yt921x_reg_read(struct yt921x_priv *priv, u32 reg, u32 *valp);
+int yt921x_reg_write(struct yt921x_priv *priv, u32 reg, u32 val);
+int yt921x_reg_wait(struct yt921x_priv *priv, u32 reg, u32 mask, u32 *valp);
+int yt921x_reg_update_bits(struct yt921x_priv *priv, u32 reg, u32 mask,
+ u32 val);
+
+static inline int
+yt921x_reg_set_bits(struct yt921x_priv *priv, u32 reg, u32 mask)
+{
+ return yt921x_reg_update_bits(priv, reg, 0, mask);
+}
+
+static inline int
+yt921x_reg_clear_bits(struct yt921x_priv *priv, u32 reg, u32 mask)
+{
+ return yt921x_reg_update_bits(priv, reg, mask, 0);
+}
+
+static inline int
+yt921x_reg_toggle_bits(struct yt921x_priv *priv, u32 reg, u32 mask, bool set)
+{
+ return yt921x_reg_update_bits(priv, reg, mask, !set ? 0 : mask);
+}
+
+/* Some multi-word registers, like VLANn_CTRL, should be treated as a single
+ * long register. More specifically, writes to parts of its words won't become
+ * visible, until the last word is written.
+ *
+ * Here we require full read and write operations over these registers to
+ * eliminate potential issues, although partial reads/writes are also possible.
+ */
+
+static inline void update_ctrls_unaligned(u32 *lo, u32 *hi, u64 mask, u64 val)
+{
+ *lo &= ~lower_32_bits(mask);
+ *hi &= ~upper_32_bits(mask);
+ *lo |= lower_32_bits(val);
+ *hi |= upper_32_bits(val);
+}
+
+/* yt921x_regs_*() are exported for linkage only. Do not use them directly. Use
+ * yt921x_reg64_*() or yt921x_reg96_*() instead.
+ */
+
+int yt921x_regs_read(struct yt921x_priv *priv, u32 reg, u32 *vals,
+ unsigned int num_regs);
+int yt921x_regs_write(struct yt921x_priv *priv, u32 reg, const u32 *vals,
+ unsigned int num_regs);
+int yt921x_regs_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
+ const u32 *vals, unsigned int num_regs);
+int yt921x_regs_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
+ unsigned int num_regs);
+
+static inline int
+yt921x_reg64_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
+{
+ return yt921x_regs_write(priv, reg, vals, 2);
+}
+
+static inline int
+yt921x_reg64_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
+ const u32 *vals)
+{
+ return yt921x_regs_update_bits(priv, reg, masks, vals, 2);
+}
+
+static inline int
+yt921x_reg64_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks)
+{
+ return yt921x_regs_clear_bits(priv, reg, masks, 2);
+}
+
+static inline int
+yt921x_reg96_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
+{
+ return yt921x_regs_write(priv, reg, vals, 3);
+}
+
+#endif
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support
2026-08-16 19:38 [PATCH net-next v10 0/4] net: dsa: motorcomm: Add LED support David Yang
2026-08-16 19:38 ` [PATCH net-next v10 1/4] net: dsa: motorcomm: Move to subdirectory David Yang
2026-08-16 19:38 ` [PATCH net-next v10 2/4] net: dsa: motorcomm: Split SMI module David Yang
@ 2026-08-16 19:38 ` David Yang
2026-08-17 19:39 ` sashiko-bot
2026-08-16 19:38 ` [PATCH net-next v10 4/4] dt-bindings: net: dsa: yt921x: Add LEDs definition example David Yang
3 siblings, 1 reply; 6+ messages in thread
From: David Yang @ 2026-08-16 19:38 UTC (permalink / raw)
To: netdev
Cc: David Yang, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, devicetree, linux-kernel
Each port has at most 3 LEDs connected and can be declared using the
standard LEDs structure.
Currently, only parallel mode and strict 1:1 mapping (i.e. the HW
default) are supported.
Signed-off-by: David Yang <mmyangfl@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/dsa/motorcomm/Kconfig | 9 +
drivers/net/dsa/motorcomm/Makefile | 1 +
drivers/net/dsa/motorcomm/chip.c | 13 +-
drivers/net/dsa/motorcomm/chip.h | 12 +
drivers/net/dsa/motorcomm/leds.c | 654 +++++++++++++++++++++++++++++
drivers/net/dsa/motorcomm/leds.h | 121 ++++++
6 files changed, 808 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/dsa/motorcomm/leds.c
create mode 100644 drivers/net/dsa/motorcomm/leds.h
diff --git a/drivers/net/dsa/motorcomm/Kconfig b/drivers/net/dsa/motorcomm/Kconfig
index 1fddd386f866..3438e0b14361 100644
--- a/drivers/net/dsa/motorcomm/Kconfig
+++ b/drivers/net/dsa/motorcomm/Kconfig
@@ -6,3 +6,12 @@ config NET_DSA_YT921X
help
This enables support for the Motorcomm YT9215 ethernet switch
chip.
+
+config NET_DSA_YT921X_LEDS
+ bool "LED support for Motorcomm YT9215"
+ default y
+ depends on NET_DSA_YT921X
+ depends on LEDS_CLASS=y || LEDS_CLASS=NET_DSA_YT921X
+ help
+ This enables support for controlling the LEDs attached to the
+ Motorcomm YT9215 switch chips.
diff --git a/drivers/net/dsa/motorcomm/Makefile b/drivers/net/dsa/motorcomm/Makefile
index 6cea5313a444..5a63db0029ff 100644
--- a/drivers/net/dsa/motorcomm/Makefile
+++ b/drivers/net/dsa/motorcomm/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: ISC
obj-$(CONFIG_NET_DSA_YT921X) += yt921x.o
yt921x-objs := chip.o
+yt921x-$(CONFIG_NET_DSA_YT921X_LEDS) += leds.o
yt921x-objs += smi.o
diff --git a/drivers/net/dsa/motorcomm/chip.c b/drivers/net/dsa/motorcomm/chip.c
index 6dee25b6754a..553efacd4f5e 100644
--- a/drivers/net/dsa/motorcomm/chip.c
+++ b/drivers/net/dsa/motorcomm/chip.c
@@ -26,6 +26,7 @@
#include <net/pkt_cls.h>
#include "chip.h"
+#include "leds.h"
#include "smi.h"
struct yt921x_mib_desc {
@@ -151,8 +152,6 @@ static const struct yt921x_info yt921x_infos[] = {
{}
};
-#define YT921X_NAME "yt921x"
-
#define YT921X_VID_UNWARE 4095
/* The interval should be small enough to avoid overflow of 32bit MIBs.
@@ -4581,6 +4580,12 @@ static int yt921x_dsa_setup(struct dsa_switch *ds)
if (res)
return res;
+#if IS_ENABLED(CONFIG_NET_DSA_YT921X_LEDS)
+ res = yt921x_leds_setup(priv);
+ if (res)
+ dev_warn(dev, "Failed to setup LEDs: %d\n", res);
+#endif
+
return 0;
}
@@ -4681,6 +4686,10 @@ static void yt921x_mdio_remove(struct mdio_device *mdiodev)
if (!priv)
return;
+#if IS_ENABLED(CONFIG_NET_DSA_YT921X_LEDS)
+ yt921x_leds_remove(priv);
+#endif
+
for (size_t i = ARRAY_SIZE(priv->ports); i-- > 0; ) {
struct yt921x_port *pp = &priv->ports[i];
diff --git a/drivers/net/dsa/motorcomm/chip.h b/drivers/net/dsa/motorcomm/chip.h
index 5f3b99e189c4..e6815cf9cb3c 100644
--- a/drivers/net/dsa/motorcomm/chip.h
+++ b/drivers/net/dsa/motorcomm/chip.h
@@ -850,9 +850,14 @@ enum yt921x_fdb_entry_status {
#define YT921X_ACL_NUM (YT921X_ACL_BLK_NUM * YT921X_ACL_ENT_PER_BLK)
#define YT921X_UDF_NUM 8
+#define YT921X_LED_GROUP_NUM 3
+#define YT921X_LED_PORT_NUM 10
+
/* 8 internal + 2 external + 1 mcu */
#define YT921X_PORT_NUM 11
+#define YT921X_NAME "yt921x"
+
#define yt921x_port_is_internal(port) ((port) < 8)
#define yt921x_port_is_external(port) ((port) == 8 || (port) == 9)
@@ -938,6 +943,13 @@ struct yt921x_port {
struct yt921x_mib mib;
u64 rx_frames;
u64 tx_frames;
+
+#if IS_ENABLED(CONFIG_NET_DSA_YT921X_LEDS)
+ unsigned char led_duty;
+ unsigned short led_cycle;
+
+ struct yt921x_led *leds[YT921X_LED_GROUP_NUM];
+#endif
};
struct yt921x_reg_ops {
diff --git a/drivers/net/dsa/motorcomm/leds.c b/drivers/net/dsa/motorcomm/leds.c
new file mode 100644
index 000000000000..e7ef0ef80a26
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/leds.c
@@ -0,0 +1,654 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#include <linux/uleds.h>
+
+#include "chip.h"
+#include "leds.h"
+#include "smi.h"
+
+#define to_yt921x_led(led_cdev) \
+ container_of_const((led_cdev), struct yt921x_led, cdev)
+#define to_yt921x_port(led) ((led)->port)
+#define to_yt921x_priv(pp) \
+ container_of_const((pp), struct yt921x_priv, ports[(pp)->index])
+#define to_device(priv) ((priv)->ds.dev)
+
+static u32 yt921x_led_regaddr(struct yt921x_priv *priv, int port, int group)
+{
+ switch (group) {
+ case 0:
+ default:
+ return YT921X_LED0_PORTn(port);
+ case 1:
+ return YT921X_LED1_PORTn(port);
+ case 2:
+ return YT921X_LED2_PORTn(port);
+ }
+}
+
+static int
+yt921x_led_force_get(struct yt921x_priv *priv, int port, int group, bool *onp)
+{
+ u32 val;
+ int res;
+
+ res = yt921x_reg_read(priv, YT921X_LED2_PORTn(port), &val);
+ if (res)
+ return res;
+
+ *onp = (val & YT921X_LED2_PORT_FORCEn_M(group)) ==
+ YT921X_LED2_PORT_FORCEn_ON(group);
+ return 0;
+}
+
+static int
+yt921x_led_force_set(struct yt921x_priv *priv, int port, int group, bool on)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_led *led = pp->leds[group];
+ u32 ctrl;
+ u32 mask;
+
+ led->use_cycle = false;
+ led->use_duty = false;
+
+ mask = YT921X_LED2_PORT_FORCEn_M(group);
+ ctrl = on ? YT921X_LED2_PORT_FORCEn_ON(group) :
+ YT921X_LED2_PORT_FORCEn_OFF(group);
+ return yt921x_reg_update_bits(priv, YT921X_LED2_PORTn(port), mask,
+ ctrl);
+}
+
+static int
+yt921x_led_blink_select(const struct yt921x_priv *priv, unsigned long on,
+ unsigned long off, unsigned short *cyclep,
+ unsigned char *dutyp)
+{
+ static const unsigned char dutys[] = {
+ YT921X_LED_DUTY(1, 6),
+ YT921X_LED_DUTY(1, 4),
+ YT921X_LED_DUTY(1, 3),
+ YT921X_LED_DUTY(1, 2),
+ };
+ unsigned int cycle_upper;
+ unsigned int cycle_req;
+ unsigned int duty_req;
+ unsigned int cycle;
+ unsigned int duty;
+
+ cycle = YT921X_LED_BLINK_MAX;
+ cycle_upper = cycle * 11585 / 8192 + 1; /* M_SQRT2 * cycle */
+ if (check_add_overflow(on, off, &cycle_req) || cycle_req >= cycle_upper)
+ return -EOPNOTSUPP;
+
+ for (; cycle > YT921X_LED_BLINK_MIN; cycle_upper >>= 1, cycle >>= 1)
+ if (cycle_req >= cycle_upper >> 1)
+ break;
+ *cyclep = cycle;
+
+ duty_req = DIV_ROUND_CLOSEST(YT921X_LED_DUTY_DENOM *
+ (on > off ? off : on), cycle_req);
+ for (unsigned int i = ARRAY_SIZE(dutys) - 1;; i--)
+ if (i == 0 || duty_req >= (dutys[i - 1] + dutys[i]) / 2) {
+ duty = dutys[i];
+ break;
+ }
+ if (on > off)
+ duty = YT921X_LED_DUTY_DENOM - duty;
+ *dutyp = duty;
+
+ return 0;
+}
+
+static int
+yt921x_led_blink_set(struct yt921x_priv *priv, int port, int group,
+ unsigned long *onp, unsigned long *offp)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_led *led = pp->leds[group];
+ unsigned short cycle;
+ unsigned char duty;
+ bool use_cycle;
+ u32 ctrl;
+ u32 mask;
+ u32 val;
+ int res;
+
+ if (!*onp && !*offp) {
+ cycle = YT921X_LED_BLINK_DEF;
+ duty = YT921X_LED_DUTY(1, 2);
+ for (unsigned int i = 0; i < YT921X_LED_GROUP_NUM; i++)
+ if (i != group && pp->leds[i] &&
+ pp->leds[i]->use_duty) {
+ duty = pp->led_duty;
+ break;
+ }
+
+ use_cycle = false;
+ } else {
+ bool change_cycle;
+ bool change_duty;
+
+ res = yt921x_led_blink_select(priv, *onp, *offp, &cycle, &duty);
+ if (res)
+ return res;
+
+ use_cycle = cycle < YT921X_LED_BLINK_DEF;
+ change_cycle = use_cycle && cycle != pp->led_cycle;
+ change_duty = duty != pp->led_duty;
+ if (change_cycle || change_duty)
+ for (unsigned int i = 0; i < YT921X_LED_GROUP_NUM;
+ i++) {
+ if (i == group || !pp->leds[i])
+ continue;
+ if ((change_cycle && pp->leds[i]->use_cycle) ||
+ (change_duty && pp->leds[i]->use_duty))
+ return -EOPNOTSUPP;
+ }
+ }
+
+ /* The chip seems to jam a while if changing duty directly */
+ res = yt921x_reg_read(priv, YT921X_LED2_PORTn(port), &val);
+ if (res)
+ return res;
+
+ ctrl = val & ~YT921X_LED2_PORT_FORCEn_M(group);
+ ctrl |= YT921X_LED2_PORT_FORCEn_DONTCARE(group);
+ if (val != ctrl) {
+ res = yt921x_reg_write(priv, YT921X_LED2_PORTn(port), ctrl);
+ if (res)
+ return res;
+ }
+
+ mask = YT921X_LED1_PORT_BLINK_DUTY_M | YT921X_LED1_PORT_BLINK_DUTY_COMP;
+ switch (duty >= YT921X_LED_DUTY(1, 2) ? duty :
+ YT921X_LED_DUTY_DENOM - duty) {
+ default:
+ duty = YT921X_LED_DUTY(1, 2);
+ fallthrough;
+ case YT921X_LED_DUTY(1, 2):
+ ctrl = YT921X_LED1_PORT_BLINK_DUTY_1_2;
+ break;
+ case YT921X_LED_DUTY(2, 3):
+ ctrl = YT921X_LED1_PORT_BLINK_DUTY_2_3;
+ break;
+ case YT921X_LED_DUTY(3, 4):
+ ctrl = YT921X_LED1_PORT_BLINK_DUTY_3_4;
+ break;
+ case YT921X_LED_DUTY(5, 6):
+ ctrl = YT921X_LED1_PORT_BLINK_DUTY_5_6;
+ break;
+ }
+ if (duty < YT921X_LED_DUTY(1, 2))
+ ctrl |= YT921X_LED1_PORT_BLINK_DUTY_COMP;
+ if (use_cycle) {
+ mask |= YT921X_LED1_PORT_OTHER_BLINK_M;
+ ctrl |= YT921X_LED1_PORT_OTHER_BLINK(9 - __fls(cycle));
+ }
+ res = yt921x_reg_update_bits(priv, YT921X_LED1_PORTn(port), mask, ctrl);
+ if (res)
+ return res;
+
+ ctrl = val & ~(YT921X_LED2_PORT_FORCEn_M(group) |
+ YT921X_LED2_PORT_FORCE_BLINKn_M(group));
+ ctrl |= YT921X_LED2_PORT_FORCEn_BLINK(group);
+ if (use_cycle)
+ ctrl |= YT921X_LED2_PORT_FORCE_BLINKn_OTHER(group);
+ else
+ ctrl |= YT921X_LED2_PORT_FORCE_BLINKn(group, __fls(cycle) - 9);
+ res = yt921x_reg_write(priv, YT921X_LED2_PORTn(port), ctrl);
+ if (res)
+ return res;
+
+ led->use_cycle = use_cycle;
+ if (use_cycle)
+ pp->led_cycle = cycle;
+ led->use_duty = true;
+ pp->led_duty = duty;
+
+ *onp = DIV_ROUND_CLOSEST(duty * cycle, YT921X_LED_DUTY_DENOM);
+ *offp = cycle - *onp;
+ return 0;
+}
+
+struct yt921x_led_trigger_map {
+ unsigned long flags;
+ u32 mask;
+};
+
+static const struct yt921x_led_trigger_map yt921x_led_trigger_maps[] = {
+ {BIT(TRIGGER_NETDEV_LINK),
+ YT921X_LEDx_PORT_ACT_DUPLEX_HALF | YT921X_LEDx_PORT_ACT_DUPLEX_FULL},
+ {BIT(TRIGGER_NETDEV_LINK_10), YT921X_LEDx_PORT_ACT_10M},
+ {BIT(TRIGGER_NETDEV_LINK_100), YT921X_LEDx_PORT_ACT_100M},
+ {BIT(TRIGGER_NETDEV_LINK_1000), YT921X_LEDx_PORT_ACT_1000M},
+ {BIT(TRIGGER_NETDEV_HALF_DUPLEX), YT921X_LEDx_PORT_ACT_DUPLEX_HALF},
+ {BIT(TRIGGER_NETDEV_FULL_DUPLEX), YT921X_LEDx_PORT_ACT_DUPLEX_FULL},
+ {BIT(TRIGGER_NETDEV_TX), YT921X_LEDx_PORT_ACT_TX_BLINK},
+ {BIT(TRIGGER_NETDEV_RX), YT921X_LEDx_PORT_ACT_RX_BLINK},
+ {BIT(TRIGGER_NETDEV_TX_ERR) | BIT(TRIGGER_NETDEV_RX_ERR),
+ YT921X_LEDx_PORT_ACT_COLLISION_BLINK},
+};
+
+static bool
+yt921x_led_trigger_is_supported(const struct yt921x_priv *priv, int port,
+ int group, unsigned long flags)
+{
+ if (!flags)
+ return true;
+
+ for (unsigned int i = 0; i < ARRAY_SIZE(yt921x_led_trigger_maps); i++) {
+ const struct yt921x_led_trigger_map *map = &yt921x_led_trigger_maps[i];
+
+ if ((flags & map->flags) == map->flags) {
+ flags &= ~map->flags;
+ if (!flags)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static int
+yt921x_led_trigger_get(struct yt921x_priv *priv, int port, int group,
+ unsigned long *flagsp)
+{
+ u32 addr;
+ u32 val;
+ int res;
+
+ res = yt921x_reg_read(priv, YT921X_LED2_PORTn(port), &val);
+ if (res)
+ return res;
+
+ if ((val & YT921X_LED2_PORT_FORCEn_M(group)) !=
+ YT921X_LED2_PORT_FORCEn_DONTCARE(group)) {
+ *flagsp = 0;
+ return 0;
+ }
+
+ if (group != 2) {
+ addr = yt921x_led_regaddr(priv, port, group);
+ res = yt921x_reg_read(priv, addr, &val);
+ if (res)
+ return res;
+ }
+
+ *flagsp = 0;
+ for (unsigned int i = 0; i < ARRAY_SIZE(yt921x_led_trigger_maps); i++) {
+ const struct yt921x_led_trigger_map *map = &yt921x_led_trigger_maps[i];
+
+ if ((val & map->mask) == map->mask)
+ *flagsp |= map->flags;
+ }
+
+ return 0;
+}
+
+static int
+yt921x_led_trigger_set(struct yt921x_priv *priv, int port, int group,
+ unsigned long flags)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_led *led = pp->leds[group];
+ u32 addr;
+ u32 ctrl;
+ u32 mask;
+ int res;
+
+ ctrl = 0;
+ for (unsigned int i = 0; i < ARRAY_SIZE(yt921x_led_trigger_maps); i++) {
+ const struct yt921x_led_trigger_map *map = &yt921x_led_trigger_maps[i];
+
+ if ((flags & map->flags) == map->flags) {
+ flags &= ~map->flags;
+ ctrl |= map->mask;
+ if (!flags)
+ break;
+ }
+ }
+ if (flags)
+ return -EOPNOTSUPP;
+
+ led->use_cycle = false;
+ led->use_duty = false;
+
+ mask = !group ? YT921X_LED0_PORT_ACT_M : YT921X_LEDx_PORT_ACT_M;
+ if (group == 2) {
+ mask |= YT921X_LED2_PORT_FORCEn_M(group);
+ ctrl |= YT921X_LED2_PORT_FORCEn_DONTCARE(group);
+ }
+ addr = yt921x_led_regaddr(priv, port, group);
+ res = yt921x_reg_update_bits(priv, addr, mask, ctrl);
+ if (res)
+ return res;
+
+ if (group != 2) {
+ mask = YT921X_LED2_PORT_FORCEn_M(group);
+ ctrl = YT921X_LED2_PORT_FORCEn_DONTCARE(group);
+ res = yt921x_reg_update_bits(priv, YT921X_LED2_PORTn(port),
+ mask, ctrl);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+static int
+yt921x_cled_brightness_set_blocking(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+ int res;
+
+ mutex_lock(&priv->reg_lock);
+ res = yt921x_led_force_set(priv, pp->index, led->group, brightness);
+ mutex_unlock(&priv->reg_lock);
+
+ return res;
+}
+
+static int
+yt921x_cled_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+ int res;
+
+ mutex_lock(&priv->reg_lock);
+ res = yt921x_led_blink_set(priv, pp->index, led->group, delay_on,
+ delay_off);
+ mutex_unlock(&priv->reg_lock);
+
+ return res;
+}
+
+static struct device * __maybe_unused
+yt921x_cled_hw_control_get_device(struct led_classdev *led_cdev)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+ struct dsa_port *dp;
+
+ dp = dsa_to_port(&priv->ds, pp->index);
+ if (!dp)
+ return NULL;
+
+ if (dsa_port_is_user(dp))
+ return &dp->user->dev;
+ if (dsa_port_is_cpu(dp))
+ return &dp->conduit->dev;
+
+ return NULL;
+}
+
+static int __maybe_unused
+yt921x_cled_hw_control_is_supported(struct led_classdev *led_cdev,
+ unsigned long flags)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+
+ if (yt921x_led_trigger_is_supported(priv, pp->index, led->group, flags))
+ return 0;
+ return -EOPNOTSUPP;
+}
+
+static int __maybe_unused
+yt921x_cled_hw_control_get(struct led_classdev *led_cdev, unsigned long *flagsp)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+ int res;
+
+ mutex_lock(&priv->reg_lock);
+ res = yt921x_led_trigger_get(priv, pp->index, led->group, flagsp);
+ mutex_unlock(&priv->reg_lock);
+
+ return res;
+}
+
+static int __maybe_unused
+yt921x_cled_hw_control_set(struct led_classdev *led_cdev, unsigned long flags)
+{
+ struct yt921x_led *led = to_yt921x_led(led_cdev);
+ struct yt921x_port *pp = to_yt921x_port(led);
+ struct yt921x_priv *priv = to_yt921x_priv(pp);
+ int res;
+
+ mutex_lock(&priv->reg_lock);
+ res = yt921x_led_trigger_set(priv, pp->index, led->group, flags);
+ mutex_unlock(&priv->reg_lock);
+
+ return res;
+}
+
+static int
+yt921x_led_setup(struct yt921x_priv *priv, int port,
+ struct fwnode_handle *fwnode)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct device *dev = to_device(priv);
+ struct led_init_data init_data;
+ struct led_classdev *led_cdev;
+ char name[LED_MAX_NAME_SIZE];
+ enum led_default_state state;
+ struct yt921x_led *led;
+ bool force_high;
+ bool force_low;
+ u32 group;
+ u32 mask;
+ u32 ctrl;
+ u32 val;
+ bool on;
+ int res;
+ int ret;
+
+ res = fwnode_property_read_u32(fwnode, "reg", &group);
+ if (res)
+ return res;
+ if (group >= YT921X_LED_GROUP_NUM) {
+ dev_err(dev, "Invalid LED reg %u for port %d\n", group, port);
+ return -EINVAL;
+ }
+ if (pp->leds[group])
+ return -EEXIST;
+
+ force_high = fwnode_property_read_bool(fwnode, "active-high");
+ force_low = fwnode_property_read_bool(fwnode, "active-low");
+ if (force_high && force_low) {
+ dev_err(dev, "Duplicate polarities for LED %02d:%02u\n",
+ port, group);
+ return -EINVAL;
+ }
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+ led->port = pp;
+ led->group = group;
+
+ state = led_init_default_state_get(fwnode);
+
+ mutex_lock(&priv->reg_lock);
+
+ /* Inversion is internal - force on will give low logic.
+ * In the rest of the file, treat LEDs as if active-low.
+ */
+ if (force_high || force_low) {
+ res = yt921x_reg_read(priv, YT921X_LED_PAR_INV, &val);
+ if (res)
+ goto unlock;
+
+ mask = YT921X_LED_PAR_INV_INVnm(group, port);
+ ctrl = force_high ? val | mask : val & ~mask;
+ res = yt921x_reg_write(priv, YT921X_LED_PAR_INV, ctrl);
+ if (res)
+ goto unlock;
+ }
+
+ pp->leds[group] = led;
+
+ switch (state) {
+ case LEDS_DEFSTATE_OFF:
+ case LEDS_DEFSTATE_ON:
+ default:
+ on = state == LEDS_DEFSTATE_ON;
+ res = yt921x_led_force_set(priv, port, group, on);
+ break;
+ case LEDS_DEFSTATE_KEEP:
+ res = yt921x_led_force_get(priv, port, group, &on);
+ break;
+ }
+
+unlock:
+ mutex_unlock(&priv->reg_lock);
+ if (res)
+ goto err;
+
+ led_cdev = &led->cdev;
+ led_cdev->brightness = on;
+ led_cdev->max_brightness = 1;
+ led_cdev->flags = LED_RETAIN_AT_SHUTDOWN;
+ led_cdev->brightness_set_blocking = yt921x_cled_brightness_set_blocking;
+ led_cdev->blink_set = yt921x_cled_blink_set;
+#ifdef CONFIG_LEDS_TRIGGERS
+ led_cdev->hw_control_trigger = "netdev";
+ led_cdev->hw_control_get_device = yt921x_cled_hw_control_get_device;
+ led_cdev->hw_control_is_supported = yt921x_cled_hw_control_is_supported;
+ led_cdev->hw_control_get = yt921x_cled_hw_control_get;
+ led_cdev->hw_control_set = yt921x_cled_hw_control_set;
+#endif
+
+ snprintf(name, sizeof(name), YT921X_NAME "-%u:%02d:%02u",
+ priv->ds.index, port, group);
+ init_data = (typeof(init_data)){
+ .fwnode = fwnode,
+ .default_label = ":port",
+ .devicename = name,
+ .devname_mandatory = true,
+ };
+ res = devm_led_classdev_register_ext(dev, led_cdev, &init_data);
+ if (res)
+ goto err;
+
+ return 0;
+
+err:
+ ret = res;
+
+ mutex_lock(&priv->reg_lock);
+ if (pp->leds[group]) {
+ if (force_high || force_low) {
+ res = yt921x_reg_write(priv, YT921X_LED_PAR_INV, val);
+ if (res)
+ dev_warn(dev,
+ "Failed to revoke initialization for LED %02d:%02u\n",
+ port, group);
+ }
+
+ pp->leds[group] = NULL;
+ }
+ mutex_unlock(&priv->reg_lock);
+
+ devm_kfree(dev, led);
+ return ret;
+}
+
+static void yt921x_leds_remove_port(struct yt921x_priv *priv, int port)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct device *dev = to_device(priv);
+ bool has_leds = false;
+
+ for (int group = 0; group < YT921X_LED_GROUP_NUM; group++) {
+ struct yt921x_led *led = pp->leds[group];
+
+ if (led) {
+ devm_led_classdev_unregister(dev, &led->cdev);
+ has_leds = true;
+ }
+ }
+
+ if (!has_leds)
+ return;
+
+ /* Now no one can access the LED control blocks, free them without
+ * holding the lock.
+ */
+ for (int group = 0; group < YT921X_LED_GROUP_NUM; group++) {
+ struct yt921x_led *led = pp->leds[group];
+
+ if (led) {
+ pp->leds[group] = NULL;
+ devm_kfree(dev, led);
+ }
+ }
+}
+
+static int yt921x_leds_setup_port(struct yt921x_priv *priv, int port)
+{
+ struct device *dev = to_device(priv);
+ struct dsa_switch *ds = &priv->ds;
+ struct device_node *leds_np;
+ struct dsa_port *dp;
+
+ dp = dsa_to_port(ds, port);
+ leds_np = of_get_child_by_name(dp->dn, "leds");
+ if (!leds_np)
+ return 0;
+
+ if (port >= YT921X_LED_PORT_NUM) {
+ dev_err(dev, "Cannot configure LEDs for port %d\n", port);
+ of_node_put(leds_np);
+ return -EINVAL;
+ }
+
+ for_each_child_of_node_scoped(leds_np, led_np) {
+ yt921x_led_setup(priv, port, of_fwnode_handle(led_np));
+ /* Allow partial configuration: LEDs are optional */
+ }
+
+ of_node_put(leds_np);
+ return 0;
+}
+
+void yt921x_leds_remove(struct yt921x_priv *priv)
+{
+ for (int port = 0; port < YT921X_LED_PORT_NUM; port++)
+ yt921x_leds_remove_port(priv, port);
+}
+
+int yt921x_leds_setup(struct yt921x_priv *priv)
+{
+ struct dsa_switch *ds = &priv->ds;
+ struct dsa_port *dp;
+
+ /* LEDs are always enabled. There is no way to disable them altogether
+ * (as far as I know).
+ */
+
+ dsa_switch_for_each_port(dp, ds) {
+ int port = dp->index;
+
+ if (!dp->dn)
+ continue;
+
+ yt921x_leds_setup_port(priv, port);
+ /* Allow partial configuration: LEDs are optional */
+ }
+
+ return 0;
+}
diff --git a/drivers/net/dsa/motorcomm/leds.h b/drivers/net/dsa/motorcomm/leds.h
new file mode 100644
index 000000000000..3c3642988ac7
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/leds.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#ifndef _YT_LEDS_H
+#define _YT_LEDS_H
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/kconfig.h>
+#include <linux/leds.h>
+
+#define YT921X_LED_CTRL 0xd0000
+#define YT921X_LED_CTRL_UNK BIT(21)
+#define YT921X_LED_CTRL_LOOPDETECT_BLINK_M GENMASK(20, 19) /* cycle = 512 * x ms */
+#define YT921X_LED_CTRL_LOOPDETECT_BLINK(x) FIELD_PREP(YT921X_LED_CTRL_LOOPDETECT_BLINK_M, (x))
+#define YT921X_LED_CTRL_PORT_NUM_M GENMASK(16, 13)
+#define YT921X_LED_CTRL_PORT_NUM(x) FIELD_PREP(YT921X_LED_CTRL_PORT_NUM_M, (x))
+#define YT921X_LED_CTRL_MODE_M GENMASK(1, 0)
+#define YT921X_LED_CTRL_MODE(x) FIELD_PREP(YT921X_LED_CTRL_MODE_M, (x))
+#define YT921X_LED_CTRL_MODE_PARALLEL YT921X_LED_CTRL_MODE(0)
+#define YT921X_LED_CTRL_MODE_SERIAL YT921X_LED_CTRL_MODE(2)
+#define YT921X_LED0_PORTn(port) (0xd0004 + 4 * (port))
+#define YT921X_LED0_PORT_ACT_M GENMASK(17, 0)
+#define YT921X_LED0_PORT_ACT_LINK_TRY_DIS BIT(17)
+#define YT921X_LED0_PORT_ACT_COLLISION_BLINK_INDI BIT(16)
+#define YT921X_LED1_PORTn(port) (0xd0040 + 4 * (port))
+#define YT921X_LED1_PORT_OTHER_BLINK_M GENMASK(31, 30) /* cycle = 512 >> x ms */
+#define YT921X_LED1_PORT_OTHER_BLINK(x) FIELD_PREP(YT921X_LED1_PORT_OTHER_BLINK_M, (x))
+#define YT921X_LED1_PORT_EEE_BLINK_M GENMASK(29, 28) /* cycle = 512 >> x ms */
+#define YT921X_LED1_PORT_EEE_BLINK(x) FIELD_PREP(YT921X_LED1_PORT_EEE_BLINK_M, (x))
+#define YT921X_LED1_PORT_BLINK_DUTY_COMP BIT(27)
+#define YT921X_LED1_PORT_BLINK_DUTY_M GENMASK(26, 25)
+#define YT921X_LED1_PORT_BLINK_DUTY(x) FIELD_PREP(YT921X_LED1_PORT_BLINK_DUTY_M, (x))
+#define YT921X_LED1_PORT_BLINK_DUTY_1_2 YT921X_LED1_PORT_BLINK_DUTY(0)
+#define YT921X_LED1_PORT_BLINK_DUTY_2_3 YT921X_LED1_PORT_BLINK_DUTY(1)
+#define YT921X_LED1_PORT_BLINK_DUTY_3_4 YT921X_LED1_PORT_BLINK_DUTY(2)
+#define YT921X_LED1_PORT_BLINK_DUTY_5_6 YT921X_LED1_PORT_BLINK_DUTY(3)
+#define YT921X_LED2_PORTn(port) (0xd0080 + 4 * (port))
+#define YT921X_LED2_PORT_FORCEn_M(grp) GENMASK(4 * (grp) + 19, 4 * (grp) + 18)
+#define YT921X_LED2_PORT_FORCEn(grp, x) ((x) << (4 * (grp) + 18))
+#define YT921X_LED2_PORT_FORCEn_DONTCARE(grp) YT921X_LED2_PORT_FORCEn(grp, 0)
+#define YT921X_LED2_PORT_FORCEn_BLINK(grp) YT921X_LED2_PORT_FORCEn(grp, 1)
+#define YT921X_LED2_PORT_FORCEn_ON(grp) YT921X_LED2_PORT_FORCEn(grp, 2)
+#define YT921X_LED2_PORT_FORCEn_OFF(grp) YT921X_LED2_PORT_FORCEn(grp, 3)
+#define YT921X_LED2_PORT_FORCE_BLINKn_M(grp) GENMASK(4 * (grp) + 17, 4 * (grp) + 16) /* cycle = 512 << x ms */
+#define YT921X_LED2_PORT_FORCE_BLINKn(grp, x) ((x) << (4 * (grp) + 16))
+#define YT921X_LED2_PORT_FORCE_BLINKn_OTHER(grp) YT921X_LED2_PORT_FORCE_BLINKn(grp, 3)
+#define YT921X_LEDx_PORT_ACT_M GENMASK(15, 0)
+#define YT921X_LEDx_PORT_ACT_EEE_BLINK BIT(15)
+#define YT921X_LEDx_PORT_ACT_LOOPDETECT_BLINK BIT(14)
+#define YT921X_LEDx_PORT_ACT_ACTIVE_BLINK BIT(13)
+#define YT921X_LEDx_PORT_ACT_DUPLEX_FULL BIT(12)
+#define YT921X_LEDx_PORT_ACT_DUPLEX_HALF BIT(11)
+#define YT921X_LEDx_PORT_ACT_TX_BLINK BIT(10)
+#define YT921X_LEDx_PORT_ACT_RX_BLINK BIT(9)
+#define YT921X_LEDx_PORT_ACT_TX BIT(8)
+#define YT921X_LEDx_PORT_ACT_RX BIT(7)
+#define YT921X_LEDx_PORT_ACT_1000M BIT(6)
+#define YT921X_LEDx_PORT_ACT_100M BIT(5)
+#define YT921X_LEDx_PORT_ACT_10M BIT(4)
+#define YT921X_LEDx_PORT_ACT_COLLISION_BLINK BIT(3)
+#define YT921X_LEDx_PORT_ACT_1000M_BLINK BIT(2)
+#define YT921X_LEDx_PORT_ACT_100M_BLINK BIT(1)
+#define YT921X_LEDx_PORT_ACT_10M_BLINK BIT(0)
+#define YT921X_LED_SER_CTRL 0xd0100
+#define YT921X_LED_SER_CTRL_UNK GENMASK(25, 24) /* delay? */
+#define YT921X_LED_SER_CTRL_ACTIVE_LOW BIT(4)
+#define YT921X_LED_SER_CTRL_GRP_NUM_M GENMASK(1, 0) /* #grp - 1 */
+#define YT921X_LED_SER_CTRL_GRP_NUM(x) FIELD_PREP(YT921X_LED_SER_CTRL_GRP_NUM_M, (x))
+#define YT921X_LED_SER_MAPnm(grp, port) (0xd0104 + 8 * (2 - (grp)) + 4 * ((port) / 5))
+#define YT921X_LED_SER_MAP_DSTn_PORT_M(port) GENMASK(6 * ((port) % 5) + 5, 6 * ((port) % 5) + 2)
+#define YT921X_LED_SER_MAP_DSTn_PORT(port, x) ((x) << (6 * ((port) % 5) + 2))
+#define YT921X_LED_SER_MAP_DSTn_LED_M(port) GENMASK(6 * ((port) % 5) + 1, 6 * ((port) % 5))
+#define YT921X_LED_SER_MAP_DSTn_LED(port, x) ((x) << (6 * ((port) % 5)))
+#define YT921X_LED_PAR_PORTS 0xd01c4
+#define YT921X_LED_PAR_INV 0xd01c8
+#define YT921X_LED_PAR_INV_INVnm(grp, port) BIT(10 * (grp) + (port))
+#define YT921X_LED_PAR_MAPn(port) (0xd01d0 + 4 * (port))
+#define YT921X_LED_PAR_MAP_DSTn_PORT_M(grp) GENMASK(6 * (grp) + 5, 6 * (grp) + 2)
+#define YT921X_LED_PAR_MAP_DSTn_PORT(grp, x) ((x) << (6 * (grp) + 2))
+#define YT921X_LED_PAR_MAP_DSTn_LED_M(grp) GENMASK(6 * (grp) + 1, 6 * (grp))
+#define YT921X_LED_PAR_MAP_DSTn_LED(grp, x) ((x) << (6 * (grp)))
+
+#define YT921X_LED_BLINK_MIN 64
+#define YT921X_LED_BLINK_DEF 512
+#define YT921X_LED_BLINK_MAX 2048
+
+/* 2 * lcm(2, 3, 4, 6) */
+#define YT921X_LED_DUTY_DENOM 24
+#define YT921X_LED_DUTY(nom, denom) (YT921X_LED_DUTY_DENOM * (nom) / (denom))
+
+struct yt921x_priv;
+
+struct yt921x_led {
+ struct led_classdev cdev;
+ struct yt921x_port *port;
+ unsigned char group;
+
+ bool use_cycle:1;
+ bool use_duty:1;
+};
+
+#if IS_ENABLED(CONFIG_NET_DSA_YT921X_LEDS)
+
+void yt921x_leds_remove(struct yt921x_priv *priv);
+int yt921x_leds_setup(struct yt921x_priv *priv);
+
+#else
+
+static inline void yt921x_leds_remove(struct yt921x_priv *priv) {}
+
+static inline int yt921x_leds_setup(struct yt921x_priv *priv)
+{
+ return 0;
+}
+
+#endif
+
+#endif
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support
2026-08-16 19:38 ` [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support David Yang
@ 2026-08-17 19:39 ` sashiko-bot
0 siblings, 0 replies; 6+ messages in thread
From: sashiko-bot @ 2026-08-17 19:39 UTC (permalink / raw)
To: David Yang; +Cc: conor+dt, devicetree, robh
Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Critical] Unconditional kernel panic during probe due to pointer arithmetic on NULL net_device pointers in yt921x_cled_hw_control_get_device().
--
--- Patch [3]: [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support ---
commit 25a5fb03fc03b52bd3ea80525b1fd57bd6de812d
Author: David Yang <mmyangfl@gmail.com>
net: dsa: motorcomm: Add LED support
This commit adds support for controlling the LEDs attached to the
Motorcomm YT9215 switch chips via the standard LEDs subsystem. It
currently supports parallel mode and strict 1:1 mapping.
> diff --git a/drivers/net/dsa/motorcomm/leds.c b/drivers/net/dsa/motorcomm/leds.c
> new file mode 100644
> index 0000000000000..e7ef0ef80a266
> --- /dev/null
> +++ b/drivers/net/dsa/motorcomm/leds.c
[ ... ]
> +static struct device * __maybe_unused
> +yt921x_cled_hw_control_get_device(struct led_classdev *led_cdev)
> +{
> + struct yt921x_led *led = to_yt921x_led(led_cdev);
> + struct yt921x_port *pp = to_yt921x_port(led);
> + struct yt921x_priv *priv = to_yt921x_priv(pp);
> + struct dsa_port *dp;
> +
> + dp = dsa_to_port(&priv->ds, pp->index);
> + if (!dp)
> + return NULL;
> +
> + if (dsa_port_is_user(dp))
> + return &dp->user->dev;
> + if (dsa_port_is_cpu(dp))
> + return &dp->conduit->dev;
[Severity: Critical]
Could this cause a kernel panic during probe if dp->user or dp->conduit is
NULL?
When the hw_control_trigger is set to netdev during driver setup, the LED
core immediately activates the netdev trigger, which in turn calls
yt921x_cled_hw_control_get_device().
At this point during probe, the user ports are not fully instantiated yet,
meaning dp->user is NULL. Unconditionally returning &dp->user->dev performs
pointer arithmetic on the NULL pointer, yielding a non-zero invalid pointer
because dev is located at an offset within struct net_device.
The netdev trigger core evaluates this pointer as true and calls to_net_dev()
on it, which subtracts the offset and yields exactly NULL. It then attempts
to dereference the network device name, crashing the kernel.
Does this need an explicit check to verify dp->user and dp->conduit are valid
pointers before accessing their dev members?
> +
> + return NULL;
> +}
[ ... ]
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260816193905.218112-1-mmyangfl@gmail.com?part=3
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH net-next v10 4/4] dt-bindings: net: dsa: yt921x: Add LEDs definition example
2026-08-16 19:38 [PATCH net-next v10 0/4] net: dsa: motorcomm: Add LED support David Yang
` (2 preceding siblings ...)
2026-08-16 19:38 ` [PATCH net-next v10 3/4] net: dsa: motorcomm: Add LED support David Yang
@ 2026-08-16 19:38 ` David Yang
3 siblings, 0 replies; 6+ messages in thread
From: David Yang @ 2026-08-16 19:38 UTC (permalink / raw)
To: netdev
Cc: David Yang, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, devicetree, linux-kernel
Add LEDs definition example for yt921x to describe how they should be
defined for a correct usage.
Signed-off-by: David Yang <mmyangfl@gmail.com>
---
.../bindings/net/dsa/motorcomm,yt921x.yaml | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml b/Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml
index 33a6552e46fc..93ba5b181205 100644
--- a/Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml
@@ -21,6 +21,9 @@ description: |
Any port can be used as the CPU port.
+ Each port has at most 3 LEDs connected and can be declared using the standard
+ LEDs structure.
+
properties:
compatible:
const: motorcomm,yt9215
@@ -59,6 +62,7 @@ unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/leds/common.h>
mdio {
#address-cells = <1>;
@@ -113,6 +117,25 @@ examples:
label = "lan1";
phy-mode = "internal";
phy-handle = <&sw_phy0>;
+
+ leds {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0>;
+ color = <LED_COLOR_ID_WHITE>;
+ function = LED_FUNCTION_LAN;
+ default-state = "keep";
+ };
+
+ led@1 {
+ reg = <1>;
+ color = <LED_COLOR_ID_AMBER>;
+ function = LED_FUNCTION_LAN;
+ default-state = "keep";
+ };
+ };
};
ethernet-port@1 {
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread