Re: [PATCH 2/2] pwm: add this series patch to support for rk-pwm and vop-pwm.

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Hi Beniamino,

于 2014年07月18日 03:24, Beniamino Galvani 写道:
On Thu, Jul 17, 2014 at 02:08:14PM +0800, caesar wrote:
Signed-off-by: caesar<caesar.wang@xxxxxxxxxxxxxx>
Hi Caesar,

just a couple of comments below.

---
  drivers/pwm/pwm-rockchip.c | 108 ++++++++++++++++++++++++++++++++++++---------
  1 file changed, 88 insertions(+), 20 deletions(-)

diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index eec2145..59b0380 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -2,6 +2,7 @@
   * PWM driver for Rockchip SoCs
   *
   * Copyright (C) 2014 Beniamino Galvani<b.galvani@xxxxxxxxx>
+ * Copyright (C) 2014 Caesar Wang<caesar.wang@xxxxxxxxxxxxxx>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
@@ -12,6 +13,8 @@
  #include <linux/io.h>
  #include <linux/module.h>
  #include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
These two should be swapped to keep the alphabetical order of the
includes.
ok,II will fix it.
  #include <linux/platform_device.h>
  #include <linux/pwm.h>
  #include <linux/time.h>
@@ -23,14 +26,37 @@
  #define PWM_CTRL_TIMER_EN	(1 << 0)
  #define PWM_CTRL_OUTPUT_EN	(1 << 3)
+
[...]
:-( ok,I will remove it.
  static int rockchip_pwm_probe(struct platform_device *pdev)
  {
+	const struct of_device_id *of_id =
+	    of_match_device(rockchip_pwm_dt_ids, &pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
  	struct rockchip_pwm_chip *pc;
  	struct resource *r;
  	int ret;
@@ -119,9 +185,12 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
  		return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pc->base = devm_ioremap_resource(&pdev->dev, r);
-	if (IS_ERR(pc->base))
-		return PTR_ERR(pc->base);
+	pc->base = of_iomap(np, 0);
+	if (!pc->base) {
+		dev_err(&pdev->dev, "failed to map controller\n");
+		ret = -ENOMEM;
+		goto fail_map;
+	}
I think that this change is not needed. devm_ioremap_resource()
guarantees an automatic unmapping when the device is destroyed.

Moreover, when of_iomap() fails you don't need to call iounmap().

Beniamino
VOP-PWM base has be requested for lcdc.
When I use devm_ioremap_resource(), the vop-pwm will request region fail.

Example:.931020] rockchip-pwm ff9401a0.pwm: can't request region for resource [mem 0xff9401a0-0xff9401af] /pwm@ff9401a0.
So ,I have to charge it.

I will be simplyfied by having:
- pc->base = devm_ioremap_resource(&pdev->dev, r);
+ if (!strcmp(of_id->compatible, "rockchip,vop-pwm"))
+ pc->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+ else
+ pc->base = devm_ioremap_resource(&pdev->dev, r);

Maybe, Could you give me better suggestions for it?

Caesar

pc->clk = devm_clk_get(&pdev->dev, NULL);
  	if (IS_ERR(pc->clk))
@@ -133,6 +202,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, pc); + pc->data = of_id->data;
  	pc->chip.dev = &pdev->dev;
  	pc->chip.ops = &rockchip_pwm_ops;
  	pc->chip.base = -1;
@@ -145,6 +215,10 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
  	}
return ret;
+
+fail_map:
+	iounmap(pc->base);
+	return ret;
  }
static int rockchip_pwm_remove(struct platform_device *pdev)
@@ -156,12 +230,6 @@ static int rockchip_pwm_remove(struct platform_device *pdev)
  	return pwmchip_remove(&pc->chip);
  }
-static const struct of_device_id rockchip_pwm_dt_ids[] = {
-	{ .compatible = "rockchip,rk2928-pwm" },
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids);
-
  static struct platform_driver rockchip_pwm_driver = {
  	.driver = {
  		.name = "rockchip-pwm",
--
1.9.1




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