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pwm: Introduce single-PWM of_xlate function
The existing pxa driver and the upcoming addition of PWM support in the TI sn565dsi86 DSI/eDP bridge driver both has a single PWM channel and thereby a need for a of_xlate function with the period as its single argument. Introduce a common helper function in the core that can be used as of_xlate by such drivers and migrate the pxa driver to use this. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Tested-by: Steev Klimaszewski <steev@kali.org> Tested-By: Steev Klimaszewski <steev@kali.org> Signed-off-by: Robert Foss <robert.foss@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20211025170925.3096444-1-bjorn.andersson@linaro.org
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@ -152,6 +152,32 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
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}
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EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
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struct pwm_device *
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of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
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{
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struct pwm_device *pwm;
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if (pc->of_pwm_n_cells < 1)
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return ERR_PTR(-EINVAL);
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/* validate that one cell is specified, optionally with flags */
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if (args->args_count != 1 && args->args_count != 2)
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return ERR_PTR(-EINVAL);
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pwm = pwm_request_from_chip(pc, 0, NULL);
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if (IS_ERR(pwm))
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return pwm;
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pwm->args.period = args->args[0];
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pwm->args.polarity = PWM_POLARITY_NORMAL;
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if (args->args_count == 2 && args->args[2] & PWM_POLARITY_INVERTED)
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pwm->args.polarity = PWM_POLARITY_INVERSED;
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return pwm;
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}
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EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
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static void of_pwmchip_add(struct pwm_chip *chip)
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{
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if (!chip->dev || !chip->dev->of_node)
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@ -148,20 +148,6 @@ static const struct platform_device_id *pxa_pwm_get_id_dt(struct device *dev)
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return id ? id->data : NULL;
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}
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static struct pwm_device *
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pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
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{
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struct pwm_device *pwm;
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pwm = pwm_request_from_chip(pc, 0, NULL);
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if (IS_ERR(pwm))
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return pwm;
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pwm->args.period = args->args[0];
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return pwm;
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}
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static int pwm_probe(struct platform_device *pdev)
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{
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const struct platform_device_id *id = platform_get_device_id(pdev);
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@ -187,7 +173,7 @@ static int pwm_probe(struct platform_device *pdev)
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pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
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if (IS_ENABLED(CONFIG_OF)) {
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pc->chip.of_xlate = pxa_pwm_of_xlate;
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pc->chip.of_xlate = of_pwm_single_xlate;
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pc->chip.of_pwm_n_cells = 1;
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}
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@ -414,6 +414,8 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
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struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
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const struct of_phandle_args *args);
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struct pwm_device *of_pwm_single_xlate(struct pwm_chip *pc,
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const struct of_phandle_args *args);
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struct pwm_device *pwm_get(struct device *dev, const char *con_id);
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struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
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