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From:   Robert Marko <robert.marko@sartura.hr>
To:     linus.walleij@linaro.org, bgolaszewski@baylibre.com,
        robh+dt@kernel.org, lee.jones@linaro.org,
        linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     luka.perkov@sartura.hr, jmp@epiphyte.org, pmenzel@molgen.mpg.de,
        buczek@molgen.mpg.de, Robert Marko <robert.marko@sartura.hr>
Subject: [PATCH v2 1/4] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support
Date:   Mon, 24 May 2021 14:05:36 +0200
Message-Id: <20210524120539.3267145-1-robert.marko@sartura.hr>
MIME-Version: 1.0
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Precedence: bulk

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@sartura.hr>
---
Changes in v2:
* Drop the custom MFD driver and header
* Use simple I2C MFD driver

 drivers/mfd/Kconfig          | 10 ++++++++++
 drivers/mfd/simple-mfd-i2c.c |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 5c7f2b100191..1042424c5678 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -297,6 +297,16 @@ 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
+	select MFD_SIMPLE_MFD_I2C
+	help
+	  Select this option to enable support for Delta Networks TN48M switch
+	  CPLD. It consists of MFD 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 87f684cff9a1..af8e91781417 100644
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -39,6 +39,7 @@ 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);
-- 
2.31.1