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Message-ID: <1354006097-25895-9-git-send-email-avinashphilip@ti.com>
Date: Tue, 27 Nov 2012 14:18:13 +0530
From: "Philip, Avinash" <avinashphilip@...com>
To: <thierry.reding@...onic-design.de>, <paul@...an.com>,
<tony@...mide.com>, <linux@....linux.org.uk>, <b-cousson@...com>
CC: <hvaibhav@...com>, <anilkumar@...com>,
<linux-kernel@...r.kernel.org>,
<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
<linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>,
<gururaja.hebbar@...com>, <vaibhav.bedia@...com>,
"Philip, Avinash" <avinashphilip@...com>,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>
Subject: [PATCH v5 08/12] pwm: tiehrpwm: Add device-tree binding
This patch
1. Add support for device-tree binding for EHRWPM driver.
2. Set size of pwm-cells set to 3 to support PWM channel number, PWM
period & polarity configuration from device tree.
3. Add enable/disable clock gating in PWM subsystem common config space.
4. When here set .owner member in platform_driver structure to
THIS_MODULE.
Signed-off-by: Philip, Avinash <avinashphilip@...com>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Rob Landley <rob@...dley.net>
---
Changes since v4:
- Made dt match property in single line for consistency
- Corrected commit subject for consistency.
Changes since v3:
- Replace pwmss.h with pwm-tipwmss.h
Changes since v2:
- Add of_pwm_xlate_with_flags function support
Changes since v1:
- Add separate patch for pinctrl support
- Add conditional check for PWM subsystem clock enable.
- Combined with HWMOD changes & DT bindings.
- Remove the custom of_xlate support.
.../devicetree/bindings/pwm/pwm-tiehrpwm.txt | 23 +++++++++++
drivers/pwm/pwm-tiehrpwm.c | 42 +++++++++++++++++++-
2 files changed, 64 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
diff --git a/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
new file mode 100644
index 0000000..4fc7079
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
@@ -0,0 +1,23 @@
+TI SOC EHRPWM based PWM controller
+
+Required properties:
+- compatible : Must be "ti,am33xx-ehrpwm"
+- #pwm-cells: Should be 3. Number of cells being used to specify PWM property.
+ First cell specifies the per-chip index of the PWM to use, the second
+ cell is the period in nanoseconds and bit 0 in the third cell is used to
+ encode the polarity of PWM output. Set bit 0 of the third in PWM specifier
+ to 1 for inverse polarity & set to 0 for normal polarity.
+- reg: physical base address and size of the registers map.
+
+Optional properties:
+- ti,hwmods: Name of the hwmod associated to the EHRPWM:
+ "ehrpwm<x>", <x> being the 0-based instance number from the HW spec
+
+Example:
+
+ehrpwm0: ehrpwm@0 {
+ compatible = "ti,am33xx-ehrpwm";
+ #pwm-cells = <3>;
+ reg = <0x48300200 0x100>;
+ ti,hwmods = "ehrpwm0";
+};
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 56a1325..d3194c0 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -25,6 +25,9 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+
+#include "pwm-tipwmss.h"
/* EHRPWM registers and bits definitions */
@@ -399,12 +402,19 @@ static const struct pwm_ops ehrpwm_pwm_ops = {
.owner = THIS_MODULE,
};
+static const struct of_device_id ehrpwm_of_match[] = {
+ { .compatible = "ti,am33xx-ehrpwm" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
+
static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct clk *clk;
struct ehrpwm_pwm_chip *pc;
+ u16 status;
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc) {
@@ -426,6 +436,8 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev)
pc->chip.dev = &pdev->dev;
pc->chip.ops = &ehrpwm_pwm_ops;
+ pc->chip.of_xlate = of_pwm_xlate_with_flags;
+ pc->chip.of_pwm_n_cells = 3;
pc->chip.base = -1;
pc->chip.npwm = NUM_PWM_CHANNEL;
@@ -454,14 +466,40 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev)
}
pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ status = pwmss_submodule_state_change(pdev->dev.parent,
+ PWMSS_EPWMCLK_EN);
+ if (!(status & PWMSS_EPWMCLK_EN_ACK)) {
+ dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
+ ret = -EINVAL;
+ goto pwmss_clk_failure;
+ }
+
+ pm_runtime_put_sync(&pdev->dev);
+
platform_set_drvdata(pdev, pc);
return 0;
+
+pwmss_clk_failure:
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pwmchip_remove(&pc->chip);
+ return ret;
}
static int __devexit ehrpwm_pwm_remove(struct platform_device *pdev)
{
struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
+ pm_runtime_get_sync(&pdev->dev);
+ /*
+ * Due to hardware misbehaviour, acknowledge of the stop_req
+ * is missing. Hence checking of the status bit skipped.
+ */
+ pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ);
+ pm_runtime_put_sync(&pdev->dev);
+
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return pwmchip_remove(&pc->chip);
@@ -469,7 +507,9 @@ static int __devexit ehrpwm_pwm_remove(struct platform_device *pdev)
static struct platform_driver ehrpwm_pwm_driver = {
.driver = {
- .name = "ehrpwm",
+ .name = "ehrpwm",
+ .owner = THIS_MODULE,
+ .of_match_table = ehrpwm_of_match,
},
.probe = ehrpwm_pwm_probe,
.remove = __devexit_p(ehrpwm_pwm_remove),
--
1.7.0.4
--
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