From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
To: <nicolas.ferre@atmel.com>, <boris.brezillon@free-electrons.com>,
<alexandre.belloni@free-electrons.com>, <sameo@linux.intel.com>,
<lee.jones@linaro.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <robh+dt@kernel.org>,
<pawel.moll@arm.com>, <mark.rutland@arm.com>,
<ijc+devicetree@hellion.org.uk>, <galak@codeaurora.org>,
<devicetree@vger.kernel.org>,
Cyrille Pitchen <cyrille.pitchen@atmel.com>
Subject: [PATCH v2 2/2] mfd: flexcom: add a driver for Atmel Flexible Serial Communication Unit
Date: Thu, 18 Jun 2015 15:05:10 +0200 [thread overview]
Message-ID: <bc25d9365ba31f987437ff4f0f2ee60c19639270.1434632230.git.cyrille.pitchen@atmel.com> (raw)
In-Reply-To: <cover.1434632230.git.cyrille.pitchen@atmel.com>
This driver supports the new Atmel Flexcom. The Flexcom is a wrapper which
integrates one SPI controller, one I2C controller and one USART. Only one
function can be enabled at a time. This driver selects the function once
for all, when the Flexcom is probed, according to the value of the new
"atmel,flexcom-mode" device tree property.
This driver has chosen to present the Flexcom to the system as a MFD so
the implementation is seamless for the existing Atmel SPI, I2C and USART
drivers.
Also the Flexcom embeds FIFOs: the latest patches of the SPI, I2C and
USART drivers take advantage of this new feature.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mfd/Kconfig | 11 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/atmel-flexcom.c | 97 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 109 insertions(+)
create mode 100644 drivers/mfd/atmel-flexcom.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d5ad04d..9b33ad0 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -59,6 +59,17 @@ config MFD_AAT2870_CORE
additional drivers must be enabled in order to use the
functionality of the device.
+config MFD_ATMEL_FLEXCOM
+ tristate "Atmel Flexcom (Flexible Serial Communication Unit)"
+ select MFD_CORE
+ depends on OF
+ help
+ Select this to get support for Atmel Flexcom. This is a wrapper
+ which embeds a SPI controller, a I2C controller and a USART. Only
+ one function can be used at a time. The choice is done at boot time
+ by the probe function of this MFD driver according to a device tree
+ property.
+
config MFD_ATMEL_HLCDC
tristate "Atmel HLCDC (High-end LCD Controller)"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0e5cfeb..c666bf5 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_MFD_SPMI_PMIC) += qcom-spmi-pmic.o
obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
obj-$(CONFIG_MFD_TPS65090) += tps65090.o
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
+obj-$(CONFIG_MFD_ATMEL_FLEXCOM) += atmel-flexcom.o
obj-$(CONFIG_MFD_ATMEL_HLCDC) += atmel-hlcdc.o
obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
obj-$(CONFIG_MFD_PALMAS) += palmas.o
diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
new file mode 100644
index 0000000..fb348d9
--- /dev/null
+++ b/drivers/mfd/atmel-flexcom.c
@@ -0,0 +1,97 @@
+/*
+ * Driver for Atmel Flexcom
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *
+ * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#define FX_MR 0x0
+#define FX_RHR 0x10
+#define FX_THR 0x20
+#define FX_VERSION 0xfc
+
+#define FX_MR_NO_COM 0
+#define FX_MR_USART 1
+#define FX_MR_SPI 2
+#define FX_MR_TWI 3
+
+
+static int atmel_flexcom_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ struct resource *res;
+ unsigned char __iomem *map;
+ unsigned int version, mr;
+ const char *mode;
+ int err;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ map = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ err = of_property_read_string(pdev->dev.of_node,
+ "atmel,flexcom-mode", &mode);
+ if (err)
+ return err;
+
+ if (!strcmp(mode, "usart"))
+ mr = FX_MR_USART;
+ else if (!strcmp(mode, "spi"))
+ mr = FX_MR_SPI;
+ else if (!strcmp(mode, "twi") || !strcmp(mode, "i2c"))
+ mr = FX_MR_TWI;
+ else
+ return -EINVAL;
+
+ clk_prepare_enable(clk);
+ version = readl(map + FX_VERSION);
+ writel(mr, map + FX_MR);
+ clk_disable_unprepare(clk);
+
+ dev_info(&pdev->dev, "hw version: %#x, mode: %s\n", version, mode);
+
+ return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+}
+
+static const struct of_device_id atmel_flexcom_of_match[] = {
+ { .compatible = "atmel,sama5d2-flexcom" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
+
+static struct platform_driver atmel_flexcom_driver = {
+ .driver = {
+ .name = "atmel_flexcom",
+ .of_match_table = atmel_flexcom_of_match,
+ },
+ .probe = atmel_flexcom_probe,
+};
+
+module_platform_driver(atmel_flexcom_driver);
+
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
+MODULE_DESCRIPTION("Atmel Flexcom MFD driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_flexcom");
--
1.8.2.2
WARNING: multiple messages have this Message-ID (diff)
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
To: nicolas.ferre@atmel.com, boris.brezillon@free-electrons.com,
alexandre.belloni@free-electrons.com, sameo@linux.intel.com,
lee.jones@linaro.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, robh+dt@kernel.org,
pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
devicetree@vger.kernel.org,
Cyrille Pitchen <cyrille.pitchen@atmel.com>
Subject: [PATCH v2 2/2] mfd: flexcom: add a driver for Atmel Flexible Serial Communication Unit
Date: Thu, 18 Jun 2015 15:05:10 +0200 [thread overview]
Message-ID: <bc25d9365ba31f987437ff4f0f2ee60c19639270.1434632230.git.cyrille.pitchen@atmel.com> (raw)
In-Reply-To: <cover.1434632230.git.cyrille.pitchen@atmel.com>
This driver supports the new Atmel Flexcom. The Flexcom is a wrapper which
integrates one SPI controller, one I2C controller and one USART. Only one
function can be enabled at a time. This driver selects the function once
for all, when the Flexcom is probed, according to the value of the new
"atmel,flexcom-mode" device tree property.
This driver has chosen to present the Flexcom to the system as a MFD so
the implementation is seamless for the existing Atmel SPI, I2C and USART
drivers.
Also the Flexcom embeds FIFOs: the latest patches of the SPI, I2C and
USART drivers take advantage of this new feature.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mfd/Kconfig | 11 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/atmel-flexcom.c | 97 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 109 insertions(+)
create mode 100644 drivers/mfd/atmel-flexcom.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d5ad04d..9b33ad0 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -59,6 +59,17 @@ config MFD_AAT2870_CORE
additional drivers must be enabled in order to use the
functionality of the device.
+config MFD_ATMEL_FLEXCOM
+ tristate "Atmel Flexcom (Flexible Serial Communication Unit)"
+ select MFD_CORE
+ depends on OF
+ help
+ Select this to get support for Atmel Flexcom. This is a wrapper
+ which embeds a SPI controller, a I2C controller and a USART. Only
+ one function can be used at a time. The choice is done at boot time
+ by the probe function of this MFD driver according to a device tree
+ property.
+
config MFD_ATMEL_HLCDC
tristate "Atmel HLCDC (High-end LCD Controller)"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0e5cfeb..c666bf5 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_MFD_SPMI_PMIC) += qcom-spmi-pmic.o
obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
obj-$(CONFIG_MFD_TPS65090) += tps65090.o
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
+obj-$(CONFIG_MFD_ATMEL_FLEXCOM) += atmel-flexcom.o
obj-$(CONFIG_MFD_ATMEL_HLCDC) += atmel-hlcdc.o
obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
obj-$(CONFIG_MFD_PALMAS) += palmas.o
diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
new file mode 100644
index 0000000..fb348d9
--- /dev/null
+++ b/drivers/mfd/atmel-flexcom.c
@@ -0,0 +1,97 @@
+/*
+ * Driver for Atmel Flexcom
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *
+ * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#define FX_MR 0x0
+#define FX_RHR 0x10
+#define FX_THR 0x20
+#define FX_VERSION 0xfc
+
+#define FX_MR_NO_COM 0
+#define FX_MR_USART 1
+#define FX_MR_SPI 2
+#define FX_MR_TWI 3
+
+
+static int atmel_flexcom_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ struct resource *res;
+ unsigned char __iomem *map;
+ unsigned int version, mr;
+ const char *mode;
+ int err;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ map = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ err = of_property_read_string(pdev->dev.of_node,
+ "atmel,flexcom-mode", &mode);
+ if (err)
+ return err;
+
+ if (!strcmp(mode, "usart"))
+ mr = FX_MR_USART;
+ else if (!strcmp(mode, "spi"))
+ mr = FX_MR_SPI;
+ else if (!strcmp(mode, "twi") || !strcmp(mode, "i2c"))
+ mr = FX_MR_TWI;
+ else
+ return -EINVAL;
+
+ clk_prepare_enable(clk);
+ version = readl(map + FX_VERSION);
+ writel(mr, map + FX_MR);
+ clk_disable_unprepare(clk);
+
+ dev_info(&pdev->dev, "hw version: %#x, mode: %s\n", version, mode);
+
+ return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+}
+
+static const struct of_device_id atmel_flexcom_of_match[] = {
+ { .compatible = "atmel,sama5d2-flexcom" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
+
+static struct platform_driver atmel_flexcom_driver = {
+ .driver = {
+ .name = "atmel_flexcom",
+ .of_match_table = atmel_flexcom_of_match,
+ },
+ .probe = atmel_flexcom_probe,
+};
+
+module_platform_driver(atmel_flexcom_driver);
+
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
+MODULE_DESCRIPTION("Atmel Flexcom MFD driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_flexcom");
--
1.8.2.2
WARNING: multiple messages have this Message-ID (diff)
From: cyrille.pitchen@atmel.com (Cyrille Pitchen)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] mfd: flexcom: add a driver for Atmel Flexible Serial Communication Unit
Date: Thu, 18 Jun 2015 15:05:10 +0200 [thread overview]
Message-ID: <bc25d9365ba31f987437ff4f0f2ee60c19639270.1434632230.git.cyrille.pitchen@atmel.com> (raw)
In-Reply-To: <cover.1434632230.git.cyrille.pitchen@atmel.com>
This driver supports the new Atmel Flexcom. The Flexcom is a wrapper which
integrates one SPI controller, one I2C controller and one USART. Only one
function can be enabled at a time. This driver selects the function once
for all, when the Flexcom is probed, according to the value of the new
"atmel,flexcom-mode" device tree property.
This driver has chosen to present the Flexcom to the system as a MFD so
the implementation is seamless for the existing Atmel SPI, I2C and USART
drivers.
Also the Flexcom embeds FIFOs: the latest patches of the SPI, I2C and
USART drivers take advantage of this new feature.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mfd/Kconfig | 11 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/atmel-flexcom.c | 97 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 109 insertions(+)
create mode 100644 drivers/mfd/atmel-flexcom.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d5ad04d..9b33ad0 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -59,6 +59,17 @@ config MFD_AAT2870_CORE
additional drivers must be enabled in order to use the
functionality of the device.
+config MFD_ATMEL_FLEXCOM
+ tristate "Atmel Flexcom (Flexible Serial Communication Unit)"
+ select MFD_CORE
+ depends on OF
+ help
+ Select this to get support for Atmel Flexcom. This is a wrapper
+ which embeds a SPI controller, a I2C controller and a USART. Only
+ one function can be used at a time. The choice is done at boot time
+ by the probe function of this MFD driver according to a device tree
+ property.
+
config MFD_ATMEL_HLCDC
tristate "Atmel HLCDC (High-end LCD Controller)"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0e5cfeb..c666bf5 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_MFD_SPMI_PMIC) += qcom-spmi-pmic.o
obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
obj-$(CONFIG_MFD_TPS65090) += tps65090.o
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
+obj-$(CONFIG_MFD_ATMEL_FLEXCOM) += atmel-flexcom.o
obj-$(CONFIG_MFD_ATMEL_HLCDC) += atmel-hlcdc.o
obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
obj-$(CONFIG_MFD_PALMAS) += palmas.o
diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
new file mode 100644
index 0000000..fb348d9
--- /dev/null
+++ b/drivers/mfd/atmel-flexcom.c
@@ -0,0 +1,97 @@
+/*
+ * Driver for Atmel Flexcom
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *
+ * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#define FX_MR 0x0
+#define FX_RHR 0x10
+#define FX_THR 0x20
+#define FX_VERSION 0xfc
+
+#define FX_MR_NO_COM 0
+#define FX_MR_USART 1
+#define FX_MR_SPI 2
+#define FX_MR_TWI 3
+
+
+static int atmel_flexcom_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ struct resource *res;
+ unsigned char __iomem *map;
+ unsigned int version, mr;
+ const char *mode;
+ int err;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ map = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ err = of_property_read_string(pdev->dev.of_node,
+ "atmel,flexcom-mode", &mode);
+ if (err)
+ return err;
+
+ if (!strcmp(mode, "usart"))
+ mr = FX_MR_USART;
+ else if (!strcmp(mode, "spi"))
+ mr = FX_MR_SPI;
+ else if (!strcmp(mode, "twi") || !strcmp(mode, "i2c"))
+ mr = FX_MR_TWI;
+ else
+ return -EINVAL;
+
+ clk_prepare_enable(clk);
+ version = readl(map + FX_VERSION);
+ writel(mr, map + FX_MR);
+ clk_disable_unprepare(clk);
+
+ dev_info(&pdev->dev, "hw version: %#x, mode: %s\n", version, mode);
+
+ return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+}
+
+static const struct of_device_id atmel_flexcom_of_match[] = {
+ { .compatible = "atmel,sama5d2-flexcom" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
+
+static struct platform_driver atmel_flexcom_driver = {
+ .driver = {
+ .name = "atmel_flexcom",
+ .of_match_table = atmel_flexcom_of_match,
+ },
+ .probe = atmel_flexcom_probe,
+};
+
+module_platform_driver(atmel_flexcom_driver);
+
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
+MODULE_DESCRIPTION("Atmel Flexcom MFD driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_flexcom");
--
1.8.2.2
next prev parent reply other threads:[~2015-06-18 13:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 13:05 [PATCH v2 0/2] mfd: flexcom: add a driver for Flexcom Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen
2015-06-18 13:05 ` [PATCH v2 1/2] mfd: devicetree: add bindings for Atmel Flexcom Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen [this message]
2015-06-18 13:05 ` [PATCH v2 2/2] mfd: flexcom: add a driver for Atmel Flexible Serial Communication Unit Cyrille Pitchen
2015-06-18 13:05 ` Cyrille Pitchen
2015-06-19 7:34 ` Paul Bolle
2015-06-19 7:34 ` Paul Bolle
2015-06-19 7:34 ` Paul Bolle
2015-06-18 13:09 ` [PATCH v2 0/2] mfd: flexcom: add a driver for Flexcom Boris Brezillon
2015-06-18 13:09 ` Boris Brezillon
2015-06-18 13:09 ` Boris Brezillon
2015-06-18 14:52 ` Alexandre Belloni
2015-06-18 14:52 ` Alexandre Belloni
2015-06-18 14:52 ` Alexandre Belloni
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