openbmc.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Quan Nguyen <quan@os.amperecomputing.com>
To: Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
	Jean Delvare <jdelvare@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	Rob Herring <robh+dt@kernel.org>,
	Lee Jones <lee.jones@linaro.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org
Cc: Open Source Submission <patches@amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>
Subject: [PATCH v5 2/4] mfd: smpro-mfd: Adds Ampere's Altra SMpro MFD driver
Date: Tue, 13 Jul 2021 13:00:29 +0700	[thread overview]
Message-ID: <20210713060031.31568-3-quan@os.amperecomputing.com> (raw)
In-Reply-To: <20210713060031.31568-1-quan@os.amperecomputing.com>

Adds Multi-function devices driver for SMpro co-processor found on the
Mt.Jade hardware reference platform with Ampere's Altra processor family.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
Changes in v5: 
  + Dropped the use of simple-mfd-i2c driver [Quan]
  + Introduced drivers/mfd/smpro-mfd.c driver to instantiate
  sub-devices. This is to avoid DT nodes without resource issue [Quan]
  + Revised commit message [Quan]

Changes in v4:
  + Add "depends on I2C" to fix build issue found by kernel test
  robot [Guenter]

Changes in v3:
  + None

Changes in v2:
  + Used 'struct of_device_id's .data attribute [Lee Jones]

 drivers/mfd/Kconfig     | 12 +++++++
 drivers/mfd/Makefile    |  1 +
 drivers/mfd/smpro-mfd.c | 74 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 drivers/mfd/smpro-mfd.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6a3fd2d75f96..25e502cca32f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -77,6 +77,18 @@ config MFD_AS3711
 	help
 	  Support for the AS3711 PMIC from AMS
 
+config MFD_SMPRO
+	tristate "Ampere Computing MFD SMpro core driver"
+	depends on I2C
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  Say yes here to enable SMpro driver support for Ampere's Altra
+	  processor family.
+
+	  Ampere's Altra SMpro exposes an I2C regmap interface that can
+	  be accessed by child devices.
+
 config MFD_AS3722
 	tristate "ams AS3722 Power Management IC"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8116c19d5fd4..046fd36de85a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -268,6 +268,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008)	+= qcom-pm8008.o
 
 obj-$(CONFIG_SGI_MFD_IOC3)	+= ioc3.o
 obj-$(CONFIG_MFD_SIMPLE_MFD_I2C)	+= simple-mfd-i2c.o
+obj-$(CONFIG_MFD_SMPRO)		+= smpro-mfd.o
 obj-$(CONFIG_MFD_INTEL_M10_BMC)   += intel-m10-bmc.o
 
 obj-$(CONFIG_MFD_ATC260X)	+= atc260x-core.o
diff --git a/drivers/mfd/smpro-mfd.c b/drivers/mfd/smpro-mfd.c
new file mode 100644
index 000000000000..b0cd3c248507
--- /dev/null
+++ b/drivers/mfd/smpro-mfd.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ampere Altra Family SMPro MFD - I2C
+ *
+ * Copyright (c) 2021, Ampere Computing LLC
+ *
+ * Author: Quan Nguyen <quan@os.amperecomputing..com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/core.h>
+#include <linux/regmap.h>
+
+/* Identification Registers */
+#define MANUFACTURER_ID_REG     0x02
+#define AMPERE_MANUFACTURER_ID  0xCD3A
+
+static const struct regmap_config simple_word_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+};
+
+static const struct mfd_cell smpro_devs[] = {
+	MFD_CELL_NAME("smpro-hwmon"),
+};
+
+static int smpro_mfd_probe(struct i2c_client *i2c)
+{
+	const struct regmap_config *config;
+	struct regmap *regmap;
+	unsigned int val;
+	int ret;
+
+	config = device_get_match_data(&i2c->dev);
+	if (!config)
+		config = &simple_word_regmap_config;
+
+	regmap = devm_regmap_init_i2c(i2c, config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	/* Check for valid ID */
+	ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val);
+	if (ret)
+		return ret;
+
+	if (val != AMPERE_MANUFACTURER_ID)
+		return -ENODEV;
+
+	return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
+				    smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL);
+}
+
+static const struct of_device_id smpro_mfd_of_match[] = {
+	{ .compatible = "ampere,smpro", .data = &simple_word_regmap_config },
+	{}
+};
+MODULE_DEVICE_TABLE(of, smpro_mfd_of_match);
+
+static struct i2c_driver smpro_mfd_driver = {
+	.probe_new = smpro_mfd_probe,
+	.driver = {
+		.name = "smpro-mfd-i2c",
+		.of_match_table = smpro_mfd_of_match,
+	},
+};
+module_i2c_driver(smpro_mfd_driver);
+
+MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
+MODULE_DESCRIPTION("SMPRO MFD - I2C driver");
+MODULE_LICENSE("GPL v2");
-- 
2.28.0


  parent reply	other threads:[~2021-07-13  6:02 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13  6:00 [PATCH v5 0/4] Add Ampere's Altra SMPro hwmon driver Quan Nguyen
2021-07-13  6:00 ` [PATCH v5 1/4] dt-bindings: mfd: Add bindings for Ampere Altra SMPro MFD driver Quan Nguyen
2021-07-16 17:34   ` Rob Herring
2021-07-17 12:51     ` Quan Nguyen
2021-07-13  6:00 ` Quan Nguyen [this message]
2021-07-13  9:11   ` [PATCH v5 2/4] mfd: smpro-mfd: Adds Ampere's Altra SMpro " Guenter Roeck
2021-07-13  9:26     ` Quan Nguyen
2021-07-13  6:00 ` [PATCH v5 3/4] hwmon: smpro: Add Ampere's Altra smpro-hwmon driver Quan Nguyen
2021-07-13 15:28   ` Guenter Roeck
2021-07-13 23:45     ` Quan Nguyen
2021-07-13  6:00 ` [PATCH v5 4/4] docs: hwmon: (smpro-hwmon) Add documentation Quan Nguyen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210713060031.31568-3-quan@os.amperecomputing.com \
    --to=quan@os.amperecomputing.com \
    --cc=andrew@aj.id.au \
    --cc=corbet@lwn.net \
    --cc=devicetree@vger.kernel.org \
    --cc=jdelvare@suse.com \
    --cc=joel@jms.id.au \
    --cc=lee.jones@linaro.org \
    --cc=linux-aspeed@lists.ozlabs.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-hwmon@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=openbmc@lists.ozlabs.org \
    --cc=patches@amperecomputing.com \
    --cc=phong@os.amperecomputing.com \
    --cc=robh+dt@kernel.org \
    --cc=thang@os.amperecomputing.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).