linux-kernel - Re: [PATCH] drm/msm/hdmi: Use pinctrl in HDMI driver

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Date:	Fri, 29 May 2015 17:56:50 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Stephane Viau <sviau@...eaurora.org>
Cc:	dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, robdclark@...il.com
Subject: Re: [PATCH] drm/msm/hdmi: Use pinctrl in HDMI driver


Hi Stephane,

On Fri, 2015-05-29 at 09:49 -0400, Stephane Viau wrote:
> Some targets (eg: msm8994) use the pinctrl framework to configure
> interface pins. This change adds support for initialization and
> pinctrl active/sleep state control for the HDMI driver.
> 
> Signed-off-by: Stephane Viau <sviau@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/hdmi/hdmi.c           | 25 +++++++++++++++++++++++++
>  drivers/gpu/drm/msm/hdmi/hdmi.h           |  5 +++++
>  drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 31 +++++++++++++++++++++++++++++++
>  3 files changed, 61 insertions(+)
> 

No devicetree binding documentation?

>  static int hdmi_bind(struct device *dev, struct device *master, void *data)
> @@ -365,6 +379,7 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
>  #ifdef CONFIG_OF
>         struct device_node *of_node = dev->of_node;
>         const struct of_device_id *match;
> +       struct pinctrl *pinctrl;
> 
>         match = of_match_node(dt_match, of_node);
>         if (match && match->data) {
> @@ -383,6 +398,16 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
>         hdmi_cfg->mux_sel_gpio  = get_gpio(dev, of_node, "qcom,hdmi-tx-mux-sel");
>         hdmi_cfg->mux_lpm_gpio  = get_gpio(dev, of_node, "qcom,hdmi-tx-mux-lpm");
> 
> +       /* not all targets have pinctrl, do not fail in case of error: */
> +       pinctrl = devm_pinctrl_get(dev);
> +       if (IS_ERR_OR_NULL(pinctrl)) {
> +               dev_warn(dev, "cannot get pinctrl: %s\n", of_node->name);
> +       } else {
> +               hdmi_cfg->active  = get_pinctrl_state(dev, pinctrl, "hdmi_active");
> +               hdmi_cfg->sleep   = get_pinctrl_state(dev, pinctrl, "hdmi_sleep");

How this differs from PINCTRL_STATE_DEFAULT and PINCTRL_STATE_SLEEP?

Regards,
Ivan
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