linux-kernel - [PATCH v11] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

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Message-Id: <20260112-mfd-tn48m-v11-1-00c798d8cd2a@kernel.org>
Date: Mon, 12 Jan 2026 17:14:52 +0100
From: Linus Walleij <linusw@...nel.org>
To: Lee Jones <lee@...nel.org>, Robert Marko <robimarko@...il.com>
Cc: Randy Dunlap <rdunlap@...radead.org>, 
 Bartosz Golaszewski <brgl@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Robert Marko <robert.marko@...tura.hr>, Linus Walleij <linusw@...nel.org>
Subject: [PATCH v11] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

From: Robert Marko <robert.marko@...tura.hr>

Delta TN48M switches have a Lattice CPLD that serves
multiple purposes including being a GPIO expander.

So, lets use the simple I2C MFD driver to provide the MFD core.

Also add a virtual symbol which pulls in the simple-mfd-i2c driver and
provide a common symbol on which the subdevice drivers can depend on.

Fixes: b3dcb5de6209 ("gpio: Add Delta TN48M CPLD GPIO driver")
Signed-off-by: Robert Marko <robert.marko@...tura.hr>
Link: https://lore.kernel.org/20220131133049.77780-2-robert.marko@sartura.hr
Link: https://lore.kernel.org/linux-gpio/20260112064950.3837737-1-rdunlap@infradead.org/
Signed-off-by: Linus Walleij <linusw@...nel.org>
---
This fell off the planet after the v5.18 merge window,
and now the subdrivers are facing deletion because the
main symbols for the driver are not there. (See Link:
tags.)

The driver has users, so here is the patch, rebased on
v6.19-rc1.

I dropped Lee's Acked-for-MFD tag because Lee will be
re-evaluating and eventually merging the patch anyway.
---
 drivers/mfd/Kconfig          | 11 +++++++++++
 drivers/mfd/simple-mfd-i2c.c |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index aace5766b38a..f7f12a0428aa 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -407,6 +407,17 @@ config MFD_CS47L92
 	help
 	  Support for Cirrus Logic CS42L92, CS47L92 and CS47L93 Smart Codecs
 
+config MFD_TN48M_CPLD
+	tristate "Delta Networks TN48M switch CPLD driver"
+	depends on I2C
+	depends on ARCH_MVEBU || COMPILE_TEST
+	select MFD_SIMPLE_MFD_I2C
+	help
+	  Select this option to enable support for Delta Networks TN48M switch
+	  CPLD. It consists of reset and GPIO drivers. CPLD provides GPIOS-s
+	  for the SFP slots as well as power supply related information.
+	  SFP support depends on the GPIO driver being selected.
+
 config PMIC_DA903X
 	bool "Dialog Semiconductor DA9030/DA9034 PMIC Support"
 	depends on I2C=y
diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
index 8b751d8e3b5a..7315fad618e4 100644
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -116,6 +116,7 @@ static const struct simple_mfd_data spacemit_p1 = {
 };
 
 static const struct of_device_id simple_mfd_i2c_of_match[] = {
+	{ .compatible = "delta,tn48m-cpld" },
 	{ .compatible = "fsl,ls1028aqds-fpga" },
 	{ .compatible = "fsl,lx2160aqds-fpga" },
 	{ .compatible = "fsl,lx2160ardb-fpga" },

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20260112-mfd-tn48m-988b4be29dc9

Best regards,
-- 
Linus Walleij <linusw@...nel.org>