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.
> #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)
> +
[...]
> 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
>
> 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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