On Fri, Aug 30, 2013 at 05:48:49PM +0800, Xiubo Li wrote:
> +
> +#define FTM_CSC_BASE 0x0C
> +#define FTM_CSC(_channel) \
> + (FTM_CSC_BASE + ((_channel) * 8))
Put into a single line.
> +#define FTMCnSC_MSB BIT(5)
> +#define FTMCnSC_MSA BIT(4)
> +#define FTMCnSC_ELSB BIT(3)
> +#define FTMCnSC_ELSA BIT(2)
> +
> +#define FTM_CV_BASE 0x10
> +#define FTM_CV(_channel) \
> + (FTM_CV_BASE + ((_channel) * 8))
ditto.
> +static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + int ret;
> + struct fsl_pwm_chip *fpc;
> + struct fsl_pwm_data *pwm_data;
> +
> + fpc = to_fsl_chip(chip);
> +
> + pwm_data = pwm_get_chip_data(pwm);
> + if (!pwm_data)
> + return -EINVAL;
> +
> + if (pwm_data->available != FSL_AVAILABLE)
> + return -EINVAL;
> +
> + ret = clk_enable(fpc->sys_clk);
> + if (ret)
> + return ret;
This is non atomic context. You can also prepare the clocks here instead
of doing it in probe().
> +
> + return 0;
> +}
> +
> +static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + struct fsl_pwm_chip *fpc;
> + struct fsl_pwm_data *pwm_data;
> +
> + fpc = to_fsl_chip(chip);
> +
> + pwm_data = pwm_get_chip_data(pwm);
> + if (!pwm_data)
> + return;
THis check seems unnecessary.
> +
> + if (pwm_data->available != FSL_AVAILABLE)
> + return;
> +
> + clk_disable(fpc->sys_clk);
> +}
> +
[...]
> +
> +
> + pwm_data->period_cycles = period_cycles;
> + pwm_data->duty_cycles = duty_cycles;
These fields are set but never read. Please drop them.
If you drop the 'available' field also the you can drop chip_data
completely.
> +
> + writel(FTMCnSC_MSB | FTMCnSC_ELSB, fpc->base + FTM_CSC(pwm->hwpwm));
> +
> + writel(0xF0, fpc->base + FTM_OUTMASK);
> + writel(0x0F, fpc->base + FTM_OUTINIT);
> + writel(FTM_CNTIN_VAL, fpc->base + FTM_CNTIN);
> +
> + writel(period_cycles + cntin - 1, fpc->base + FTM_MOD);
> + writel(duty_cycles + cntin, fpc->base + FTM_CV(pwm->hwpwm));
> +
> + return 0;
> +}
> +
> +static int fsl_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
> + enum pwm_polarity polarity)
> +{
> + unsigned long reg;
> + struct fsl_pwm_data *pwm_data;
> + struct fsl_pwm_chip *fpc;
> +
> + fpc = to_fsl_chip(chip);
> +
> + pwm_data = pwm_get_chip_data(pwm);
> + if (!pwm_data)
> + return -EINVAL;
> +
> + if (pwm_data->available != FSL_AVAILABLE)
> + return -EINVAL;
> +
> + reg = readl(fpc->base + FTM_POL);
> + reg &= ~BIT(pwm->hwpwm);
Either drop this line...
> + if (polarity == PWM_POLARITY_INVERSED)
> + reg |= BIT(pwm->hwpwm);
> + else
> + reg &= ~BIT(pwm->hwpwm);
...or this one
> +static int fsl_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + int ret;
> + struct fsl_pwm_chip *fpc;
> + struct pinctrl_state *pins_state;
> + struct fsl_pwm_data *pwm_data;
> + const char *statename;
> +
> + fpc = to_fsl_chip(chip);
> +
> + pwm_data = pwm_get_chip_data(pwm);
> + if (!pwm_data)
> + return -EINVAL;
> +
> + if (pwm_data->available != FSL_AVAILABLE)
> + return -EINVAL;
> +
> + statename = kasprintf(GFP_KERNEL, "ch%d-active", pwm->hwpwm);
You loose memory here and in fsl_pwm_disable aswell.
> + pins_state = pinctrl_lookup_state(fpc->pinctrl,
> + statename);
> + /* enable pins to be muxed in and configured */
> + if (!IS_ERR(pins_state)) {
> + ret = pinctrl_select_state(fpc->pinctrl, pins_state);
> + if (ret)
> + dev_warn(chip->dev, "could not set default pins\n");
> + } else
> + dev_warn(chip->dev, "could not get default pinstate\n");
Either it's ok to do without pinctrl or it's not ok, so either return
an error or drop the warnings. Polluting the kernel log with such
messages from a frequently called function is not a good idea.
Sascha
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