linux-kernel - Re: [PATCH v2] drm/msm/hdmi: Use pinctrl in HDMI driver

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Message-ID: <ceda7fbb98cf30c5b60bc54ead29fd80.squirrel@www.codeaurora.org>
Date:	Tue, 2 Jun 2015 10:12:59 -0500
From:	"Stéphane Viau" <sviau@...eaurora.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	"Stephane Viau" <sviau@...eaurora.org>,
	dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, robdclark@...il.com
Subject: Re: [PATCH v2] drm/msm/hdmi: Use pinctrl in HDMI driver

Hi Ivan,

>
> Hi Stephane,
>
> On Mon, 2015-06-01 at 16:28 -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>
>> ---
>> v2:
>> - Add devicetree binding documentation for pinctrl property  [Ivan]
>> - Use pinctrl framework's PINCTRL_STATE_DEFAULT/SLEEP states [Ivan]
>>
>
> <snip>
>
>>
>>  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 +398,18 @@ 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);
>
> Probably I have to be more explicit. Why not using pins binding handled in
> driver
> really_probe()? I have to admit that I am not familiar with DRM subsystem.

This would work, indeed, for default/sleep/idle states.

I actually had in mind that we'd need to keep track of HDMI pinctrl states
because we may need to add a couple more in the near future in order to
independently enable/disable certain parts of the HDMI controller (eg:
HPD, DDC, CEC..).

Each of this HW sub-sections of the controller are driven by a different
"pin" in the downstream driver... But since this is nowhere close to being
upstream-ed yet, I'll go ahead with your idea of using the common pins
binding (v3 to follow).

Thanks,
Stephane.

>
> Regards,
> Ivan
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