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* [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device
@ 2014-10-07 13:38 Boris Brezillon
  2014-10-07 13:38 ` [PATCH v10 1/2] " Boris Brezillon
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Boris Brezillon @ 2014-10-07 13:38 UTC (permalink / raw)
  To: linux-arm-kernel

Hi Thierry,

This patch series adds support for the atmel-hlcdc-pwm device provided
by the atmel-hlcdc MFD driver.

Best Regards,

Boris

Changes since v9:
 - replace select by depends on
 - rework commit messages
 - rework Kconfig description

Changes since v8:
 - rework the enable/disable waiting loop
 - check return code of regmap functions
 - fix DT binding doc

Changes since v7:
 - addressed several coding style issues


Boris Brezillon (2):
  pwm: add support for atmel-hlcdc-pwm device
  pwm: add DT bindings documentation for atmel-hlcdc-pwm driver

 .../devicetree/bindings/pwm/atmel-hlcdc-pwm.txt    |  29 +++
 drivers/pwm/Kconfig                                |  11 +
 drivers/pwm/Makefile                               |   1 +
 drivers/pwm/pwm-atmel-hlcdc.c                      | 259 +++++++++++++++++++++
 4 files changed, 300 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
 create mode 100644 drivers/pwm/pwm-atmel-hlcdc.c

-- 
1.9.1

^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH v10 1/2] pwm: add support for atmel-hlcdc-pwm device
  2014-10-07 13:38 [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
@ 2014-10-07 13:38 ` Boris Brezillon
  2014-10-07 13:38 ` [PATCH v10 2/2] pwm: add DT bindings documentation for atmel-hlcdc-pwm driver Boris Brezillon
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2014-10-07 13:38 UTC (permalink / raw)
  To: linux-arm-kernel

The HLCDC IP available in some Atmel SoCs (i.e. at91sam9x5, at91sam9n12
or sama5d3 families for instance) provides a PWM device.

This driver add support for a PWM chip exposing a single PWM device (which
will most likely be used to drive a backlight device).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Anthony Harivel <anthony.harivel@emtrion.de>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 drivers/pwm/Kconfig           |  11 ++
 drivers/pwm/Makefile          |   1 +
 drivers/pwm/pwm-atmel-hlcdc.c | 259 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 271 insertions(+)
 create mode 100644 drivers/pwm/pwm-atmel-hlcdc.c

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index b800783..6018af6 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -50,6 +50,17 @@ config PWM_ATMEL
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-atmel.
 
+config PWM_ATMEL_HLCDC_PWM
+	tristate "Atmel HLCDC PWM support"
+	depends on MFD_ATMEL_HLCDC
+	help
+	  Generic PWM framework driver for the PWM output of the HLCDC
+	  (Atmel High-end LCD Controller). This PWM output is mainly used
+	  to control the LCD backlight.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-atmel-hlcdc.
+
 config PWM_ATMEL_TCB
 	tristate "Atmel TC Block PWM support"
 	depends on ATMEL_TCLIB && OF
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index f8c577d..eb0aae5 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_PWM)		+= core.o
 obj-$(CONFIG_PWM_SYSFS)		+= sysfs.o
 obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_ATMEL)		+= pwm-atmel.o
+obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM)	+= pwm-atmel-hlcdc.o
 obj-$(CONFIG_PWM_ATMEL_TCB)	+= pwm-atmel-tcb.o
 obj-$(CONFIG_PWM_BCM_KONA)	+= pwm-bcm-kona.o
 obj-$(CONFIG_PWM_BFIN)		+= pwm-bfin.o
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
new file mode 100644
index 0000000..eaf8b12
--- /dev/null
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/mfd/atmel-hlcdc.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+
+#define ATMEL_HLCDC_PWMCVAL_MASK	GENMASK(15, 8)
+#define ATMEL_HLCDC_PWMCVAL(x)		(((x) << 8) & ATMEL_HLCDC_PWMCVAL_MASK)
+#define ATMEL_HLCDC_PWMPOL		BIT(4)
+#define ATMEL_HLCDC_PWMPS_MASK		GENMASK(2, 0)
+#define ATMEL_HLCDC_PWMPS_MAX		0x6
+#define ATMEL_HLCDC_PWMPS(x)		((x) & ATMEL_HLCDC_PWMPS_MASK)
+
+struct atmel_hlcdc_pwm {
+	struct pwm_chip chip;
+	struct atmel_hlcdc *hlcdc;
+	struct clk *cur_clk;
+};
+
+static inline struct atmel_hlcdc_pwm *to_atmel_hlcdc_pwm(struct pwm_chip *chip)
+{
+	return container_of(chip, struct atmel_hlcdc_pwm, chip);
+}
+
+static int atmel_hlcdc_pwm_config(struct pwm_chip *c,
+				  struct pwm_device *pwm,
+				  int duty_ns, int period_ns)
+{
+	struct atmel_hlcdc_pwm *chip = to_atmel_hlcdc_pwm(c);
+	struct atmel_hlcdc *hlcdc = chip->hlcdc;
+	struct clk *new_clk = hlcdc->slow_clk;
+	u64 pwmcval = duty_ns * 256;
+	unsigned long clk_freq;
+	u64 clk_period_ns;
+	u32 pwmcfg;
+	int pres;
+
+	clk_freq = clk_get_rate(new_clk);
+	clk_period_ns = (u64)NSEC_PER_SEC * 256;
+	do_div(clk_period_ns, clk_freq);
+
+	if (clk_period_ns > period_ns) {
+		new_clk = hlcdc->sys_clk;
+		clk_freq = clk_get_rate(new_clk);
+		clk_period_ns = (u64)NSEC_PER_SEC * 256;
+		do_div(clk_period_ns, clk_freq);
+	}
+
+	for (pres = 0; pres <= ATMEL_HLCDC_PWMPS_MAX; pres++)
+		if ((clk_period_ns << pres) >= period_ns)
+			break;
+
+	if (pres > ATMEL_HLCDC_PWMPS_MAX)
+		return -EINVAL;
+
+	pwmcfg = ATMEL_HLCDC_PWMPS(pres);
+
+	if (new_clk != chip->cur_clk) {
+		u32 gencfg = 0;
+		int ret;
+
+		ret = clk_prepare_enable(new_clk);
+		if (ret)
+			return ret;
+
+		clk_disable_unprepare(chip->cur_clk);
+		chip->cur_clk = new_clk;
+
+		if (new_clk == hlcdc->sys_clk)
+			gencfg = ATMEL_HLCDC_CLKPWMSEL;
+
+		ret = regmap_update_bits(hlcdc->regmap, ATMEL_HLCDC_CFG(0),
+					 ATMEL_HLCDC_CLKPWMSEL, gencfg);
+		if (ret)
+			return ret;
+	}
+
+	do_div(pwmcval, period_ns);
+
+	/*
+	 * The PWM duty cycle is configurable from 0/256 to 255/256 of the
+	 * period cycle. Hence we can't set a duty cycle occupying the
+	 * whole period cycle if we're asked to.
+	 * Set it to 255 if pwmcval is greater than 256.
+	 */
+	if (pwmcval > 255)
+		pwmcval = 255;
+
+	pwmcfg |= ATMEL_HLCDC_PWMCVAL(pwmcval);
+
+	return regmap_update_bits(hlcdc->regmap, ATMEL_HLCDC_CFG(6),
+				  ATMEL_HLCDC_PWMCVAL_MASK |
+				  ATMEL_HLCDC_PWMPS_MASK,
+				  pwmcfg);
+}
+
+static int atmel_hlcdc_pwm_set_polarity(struct pwm_chip *c,
+					struct pwm_device *pwm,
+					enum pwm_polarity polarity)
+{
+	struct atmel_hlcdc_pwm *chip = to_atmel_hlcdc_pwm(c);
+	struct atmel_hlcdc *hlcdc = chip->hlcdc;
+	u32 cfg = 0;
+
+	if (polarity == PWM_POLARITY_NORMAL)
+		cfg = ATMEL_HLCDC_PWMPOL;
+
+	return regmap_update_bits(hlcdc->regmap, ATMEL_HLCDC_CFG(6),
+				  ATMEL_HLCDC_PWMPOL, cfg);
+}
+
+static int atmel_hlcdc_pwm_enable(struct pwm_chip *c, struct pwm_device *pwm)
+{
+	struct atmel_hlcdc_pwm *chip = to_atmel_hlcdc_pwm(c);
+	struct atmel_hlcdc *hlcdc = chip->hlcdc;
+	u32 status;
+	int ret;
+
+	ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PWM);
+	if (ret)
+		return ret;
+
+	while (true) {
+		ret = regmap_read(hlcdc->regmap, ATMEL_HLCDC_SR, &status);
+		if (ret)
+			return ret;
+
+		if ((status & ATMEL_HLCDC_PWM) != 0)
+			break;
+
+		usleep_range(1, 10);
+	}
+
+	return 0;
+}
+
+static void atmel_hlcdc_pwm_disable(struct pwm_chip *c,
+				    struct pwm_device *pwm)
+{
+	struct atmel_hlcdc_pwm *chip = to_atmel_hlcdc_pwm(c);
+	struct atmel_hlcdc *hlcdc = chip->hlcdc;
+	u32 status;
+	int ret;
+
+	ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PWM);
+	if (ret)
+		return;
+
+	while (true) {
+		ret = regmap_read(hlcdc->regmap, ATMEL_HLCDC_SR, &status);
+		if (ret)
+			return;
+
+		if ((status & ATMEL_HLCDC_PWM) == 0)
+			break;
+
+		usleep_range(1, 10);
+	}
+}
+
+static const struct pwm_ops atmel_hlcdc_pwm_ops = {
+	.config = atmel_hlcdc_pwm_config,
+	.set_polarity = atmel_hlcdc_pwm_set_polarity,
+	.enable = atmel_hlcdc_pwm_enable,
+	.disable = atmel_hlcdc_pwm_disable,
+	.owner = THIS_MODULE,
+};
+
+static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct atmel_hlcdc_pwm *chip;
+	struct atmel_hlcdc *hlcdc;
+	int ret;
+
+	hlcdc = dev_get_drvdata(dev->parent);
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	ret = clk_prepare_enable(hlcdc->periph_clk);
+	if (ret)
+		return ret;
+
+	chip->hlcdc = hlcdc;
+	chip->chip.ops = &atmel_hlcdc_pwm_ops;
+	chip->chip.dev = dev;
+	chip->chip.base = -1;
+	chip->chip.npwm = 1;
+	chip->chip.of_xlate = of_pwm_xlate_with_flags;
+	chip->chip.of_pwm_n_cells = 3;
+	chip->chip.can_sleep = 1;
+
+	ret = pwmchip_add(&chip->chip);
+	if (ret) {
+		clk_disable_unprepare(hlcdc->periph_clk);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, chip);
+
+	return 0;
+}
+
+static int atmel_hlcdc_pwm_remove(struct platform_device *pdev)
+{
+	struct atmel_hlcdc_pwm *chip = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = pwmchip_remove(&chip->chip);
+	if (ret)
+		return ret;
+
+	clk_disable_unprepare(chip->hlcdc->periph_clk);
+
+	return 0;
+}
+
+static const struct of_device_id atmel_hlcdc_pwm_dt_ids[] = {
+	{ .compatible = "atmel,hlcdc-pwm" },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver atmel_hlcdc_pwm_driver = {
+	.driver = {
+		.name = "atmel-hlcdc-pwm",
+		.of_match_table = atmel_hlcdc_pwm_dt_ids,
+	},
+	.probe = atmel_hlcdc_pwm_probe,
+	.remove = atmel_hlcdc_pwm_remove,
+};
+module_platform_driver(atmel_hlcdc_pwm_driver);
+
+MODULE_ALIAS("platform:atmel-hlcdc-pwm");
+MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
+MODULE_DESCRIPTION("Atmel HLCDC PWM driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH v10 2/2] pwm: add DT bindings documentation for atmel-hlcdc-pwm driver
  2014-10-07 13:38 [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
  2014-10-07 13:38 ` [PATCH v10 1/2] " Boris Brezillon
@ 2014-10-07 13:38 ` Boris Brezillon
  2014-11-03  8:54 ` [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
  2014-11-17 11:01 ` Thierry Reding
  3 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2014-10-07 13:38 UTC (permalink / raw)
  To: linux-arm-kernel

The HLCDC IP available in some Atmel SoCs (i.e. at91sam9x5, at91sam9n12
or sama5d3 families for instance) provides a PWM device.

The DT bindings used for this PWM device is following the default 3 cells
bindings described in Documentation/devicetree/bindings/pwm/pwm.txt.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 .../devicetree/bindings/pwm/atmel-hlcdc-pwm.txt    | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt

diff --git a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
new file mode 100644
index 0000000..cfda0d5
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
@@ -0,0 +1,29 @@
+Device-Tree bindings for Atmel's HLCDC (High-end LCD Controller) PWM driver
+
+The Atmel HLCDC PWM is subdevice of the HLCDC MFD device.
+See ../mfd/atmel-hlcdc.txt for more details.
+
+Required properties:
+ - compatible: value should be one of the following:
+   "atmel,hlcdc-pwm"
+ - pinctr-names: the pin control state names. Should contain "default".
+ - pinctrl-0: should contain the pinctrl states described by pinctrl
+   default.
+ - #pwm-cells: should be set to 3. This PWM chip use the default 3 cells
+   bindings defined in pwm.txt in this directory.
+
+Example:
+
+	hlcdc: hlcdc at f0030000 {
+		compatible = "atmel,sama5d3-hlcdc";
+		reg = <0xf0030000 0x2000>;
+		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
+		clock-names = "periph_clk","sys_clk", "slow_clk";
+
+		hlcdc_pwm: hlcdc-pwm {
+			compatible = "atmel,hlcdc-pwm";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_lcd_pwm>;
+			#pwm-cells = <3>;
+		};
+	};
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device
  2014-10-07 13:38 [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
  2014-10-07 13:38 ` [PATCH v10 1/2] " Boris Brezillon
  2014-10-07 13:38 ` [PATCH v10 2/2] pwm: add DT bindings documentation for atmel-hlcdc-pwm driver Boris Brezillon
@ 2014-11-03  8:54 ` Boris Brezillon
  2014-11-14 11:05   ` Boris Brezillon
  2014-11-17 11:01 ` Thierry Reding
  3 siblings, 1 reply; 6+ messages in thread
From: Boris Brezillon @ 2014-11-03  8:54 UTC (permalink / raw)
  To: linux-arm-kernel

Hi Thierry,

On Tue,  7 Oct 2014 15:38:13 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hi Thierry,
> 
> This patch series adds support for the atmel-hlcdc-pwm device provided
> by the atmel-hlcdc MFD driver.

You seemed to be happy with this version but never told that you would
take it into your tree.

Is there anything missing (I'd really like to have the atmel-hlcdc
drivers in 3.19...) ?

Best Regards,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device
  2014-11-03  8:54 ` [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
@ 2014-11-14 11:05   ` Boris Brezillon
  0 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2014-11-14 11:05 UTC (permalink / raw)
  To: linux-arm-kernel

On Mon, 3 Nov 2014 09:54:27 +0100
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hi Thierry,
> 
> On Tue,  7 Oct 2014 15:38:13 +0200
> Boris Brezillon <boris.brezillon@free-electrons.com> wrote:
> 
> > Hi Thierry,
> > 
> > This patch series adds support for the atmel-hlcdc-pwm device provided
> > by the atmel-hlcdc MFD driver.
> 
> You seemed to be happy with this version but never told that you would
> take it into your tree.
> 
> Is there anything missing (I'd really like to have the atmel-hlcdc
> drivers in 3.19...) ?

Ping.


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device
  2014-10-07 13:38 [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
                   ` (2 preceding siblings ...)
  2014-11-03  8:54 ` [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
@ 2014-11-17 11:01 ` Thierry Reding
  3 siblings, 0 replies; 6+ messages in thread
From: Thierry Reding @ 2014-11-17 11:01 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Oct 07, 2014 at 03:38:13PM +0200, Boris Brezillon wrote:
> Hi Thierry,
> 
> This patch series adds support for the atmel-hlcdc-pwm device provided
> by the atmel-hlcdc MFD driver.
> 
> Best Regards,
> 
> Boris
> 
> Changes since v9:
>  - replace select by depends on
>  - rework commit messages
>  - rework Kconfig description
> 
> Changes since v8:
>  - rework the enable/disable waiting loop
>  - check return code of regmap functions
>  - fix DT binding doc
> 
> Changes since v7:
>  - addressed several coding style issues
> 
> 
> Boris Brezillon (2):
>   pwm: add support for atmel-hlcdc-pwm device
>   pwm: add DT bindings documentation for atmel-hlcdc-pwm driver
> 
>  .../devicetree/bindings/pwm/atmel-hlcdc-pwm.txt    |  29 +++
>  drivers/pwm/Kconfig                                |  11 +
>  drivers/pwm/Makefile                               |   1 +
>  drivers/pwm/pwm-atmel-hlcdc.c                      | 259 +++++++++++++++++++++
>  4 files changed, 300 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
>  create mode 100644 drivers/pwm/pwm-atmel-hlcdc.c

Applied, thanks.

Thierry
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^ permalink raw reply	[flat|nested] 6+ messages in thread
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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-10-07 13:38 [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
2014-10-07 13:38 ` [PATCH v10 1/2] " Boris Brezillon
2014-10-07 13:38 ` [PATCH v10 2/2] pwm: add DT bindings documentation for atmel-hlcdc-pwm driver Boris Brezillon
2014-11-03  8:54 ` [PATCH v10 0/2] pwm: add support for atmel-hlcdc-pwm device Boris Brezillon
2014-11-14 11:05   ` Boris Brezillon
2014-11-17 11:01 ` Thierry Reding

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