linux-kernel - [PATCH v10 1/6] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

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Date:   Mon, 31 Jan 2022 14:30:44 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     linus.walleij@...aro.org, brgl@...ev.pl, robh+dt@...nel.org,
        lee.jones@...aro.org, p.zabel@...gutronix.de,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh@...nel.org,
        skhan@...uxfoundation.org
Cc:     luka.perkov@...tura.hr, Robert Marko <robert.marko@...tura.hr>
Subject: [PATCH v10 1/6] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

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.

Signed-off-by: Robert Marko <robert.marko@...tura.hr>
Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
---
Changes in v9:
* Rebased onto 5.17-rc1

Changes in v9:
* Depend on ARCH_MVEBU or COMPILE_TEST

Changes in v2:
* Drop the custom MFD driver and header
* Use simple I2C MFD driver
---
 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 ba0b3eb131f1..be1ad8ce54aa 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -297,6 +297,17 @@ config MFD_ASIC3
 	  This driver supports the ASIC3 multifunction chip found on many
 	  PDAs (mainly iPAQ and HTC based ones)
 
+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 51536691ad9d..0d6a51ed6286 100644
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -64,6 +64,7 @@ static int simple_mfd_i2c_probe(struct i2c_client *i2c)
 
 static const struct of_device_id simple_mfd_i2c_of_match[] = {
 	{ .compatible = "kontron,sl28cpld" },
+	{ .compatible = "delta,tn48m-cpld" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
-- 
2.34.1