Re: [PATCHv2 4/4] s5p-cec: add hpd-notifier support, move out of staging

[Andrzej Hajda <a.hajda@samsung.com>]

On 02.01.2017 15:19, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
>
> By using the HPD notifier framework there is no longer any reason
> to manually set the physical address. This was the one blocking
> issue that prevented this driver from going out of staging, so do
> this move as well.
>
> Update the bindings documenting the new hdmi phandle and
> update exynos4.dtsi accordingly.
>
> Tested with my Odroid U3.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  .../devicetree/bindings/media/s5p-cec.txt          |  2 ++
>  arch/arm/boot/dts/exynos4.dtsi                     |  1 +
>  drivers/media/platform/Kconfig                     | 18 +++++++++++
>  drivers/media/platform/Makefile                    |  1 +
>  .../media => media/platform}/s5p-cec/Makefile      |  0
>  .../platform}/s5p-cec/exynos_hdmi_cec.h            |  0
>  .../platform}/s5p-cec/exynos_hdmi_cecctrl.c        |  0
>  .../media => media/platform}/s5p-cec/regs-cec.h    |  0
>  .../media => media/platform}/s5p-cec/s5p_cec.c     | 35 ++++++++++++++++++----
>  .../media => media/platform}/s5p-cec/s5p_cec.h     |  3 ++
>  drivers/staging/media/Kconfig                      |  2 --
>  drivers/staging/media/Makefile                     |  1 -
>  drivers/staging/media/s5p-cec/Kconfig              |  9 ------
>  drivers/staging/media/s5p-cec/TODO                 |  7 -----
>  14 files changed, 55 insertions(+), 24 deletions(-)
>  rename drivers/{staging/media => media/platform}/s5p-cec/Makefile (100%)
>  rename drivers/{staging/media => media/platform}/s5p-cec/exynos_hdmi_cec.h (100%)
>  rename drivers/{staging/media => media/platform}/s5p-cec/exynos_hdmi_cecctrl.c (100%)
>  rename drivers/{staging/media => media/platform}/s5p-cec/regs-cec.h (100%)
>  rename drivers/{staging/media => media/platform}/s5p-cec/s5p_cec.c (89%)
>  rename drivers/{staging/media => media/platform}/s5p-cec/s5p_cec.h (97%)
>  delete mode 100644 drivers/staging/media/s5p-cec/Kconfig
>  delete mode 100644 drivers/staging/media/s5p-cec/TODO
>
> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
> index 925ab4d..710fc00 100644
> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
> @@ -15,6 +15,7 @@ Required properties:
>    - clock-names : from common clock binding: must contain "hdmicec",
>  		  corresponding to entry in the clocks property.
>    - samsung,syscon-phandle - phandle to the PMU system controller
> +  - samsung,hdmi-phandle - phandle to the HDMI controller
>  
>  Example:
>  
> @@ -25,6 +26,7 @@ hdmicec: cec@100B0000 {
>  	clocks = <&clock CLK_HDMI_CEC>;
>  	clock-names = "hdmicec";
>  	samsung,syscon-phandle = <&pmu_system_controller>;
> +	samsung,hdmi-phandle = <&hdmi>;
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&hdmi_cec>;
>  	status = "okay";
> diff --git a/arch/arm/boot/dts/exynos4.dtsi b/arch/arm/boot/dts/exynos4.dtsi
> index c64737b..51dfcbb 100644
> --- a/arch/arm/boot/dts/exynos4.dtsi
> +++ b/arch/arm/boot/dts/exynos4.dtsi
> @@ -762,6 +762,7 @@
>  		clocks = <&clock CLK_HDMI_CEC>;
>  		clock-names = "hdmicec";
>  		samsung,syscon-phandle = <&pmu_system_controller>;
> +		samsung,hdmi-phandle = <&hdmi>;
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&hdmi_cec>;
>  		status = "disabled";
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index d944421..cab1637 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -392,6 +392,24 @@ config VIDEO_TI_SC
>  config VIDEO_TI_CSC
>  	tristate
>  
> +menuconfig V4L_CEC_DRIVERS
> +	bool "Platform HDMI CEC drivers"
> +	depends on MEDIA_CEC_SUPPORT
> +
> +if V4L_CEC_DRIVERS
> +
> +config VIDEO_SAMSUNG_S5P_CEC
> +       tristate "Samsung S5P CEC driver"
> +       depends on VIDEO_DEV && MEDIA_CEC_SUPPORT && (PLAT_S5P || ARCH_EXYNOS || COMPILE_TEST)
> +       select HPD_NOTIFIERS
> +       ---help---
> +         This is a driver for Samsung S5P HDMI CEC interface. It uses the
> +         generic CEC framework interface.
> +         CEC bus is present in the HDMI connector and enables communication
> +         between compatible devices.
> +
> +endif #V4L_CEC_DRIVERS
> +
>  menuconfig V4L_TEST_DRIVERS
>  	bool "Media test drivers"
>  	depends on MEDIA_CAMERA_SUPPORT
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 5b3cb27..ad3bf22 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_VIDEO_SAMSUNG_S5P_JPEG)	+= s5p-jpeg/
>  obj-$(CONFIG_VIDEO_SAMSUNG_S5P_MFC)	+= s5p-mfc/
>  
>  obj-$(CONFIG_VIDEO_SAMSUNG_S5P_G2D)	+= s5p-g2d/
> +obj-$(CONFIG_VIDEO_SAMSUNG_S5P_CEC)	+= s5p-cec/
>  obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS_GSC)	+= exynos-gsc/
>  
>  obj-$(CONFIG_VIDEO_STI_BDISP)		+= sti/bdisp/
> diff --git a/drivers/staging/media/s5p-cec/Makefile b/drivers/media/platform/s5p-cec/Makefile
> similarity index 100%
> rename from drivers/staging/media/s5p-cec/Makefile
> rename to drivers/media/platform/s5p-cec/Makefile
> diff --git a/drivers/staging/media/s5p-cec/exynos_hdmi_cec.h b/drivers/media/platform/s5p-cec/exynos_hdmi_cec.h
> similarity index 100%
> rename from drivers/staging/media/s5p-cec/exynos_hdmi_cec.h
> rename to drivers/media/platform/s5p-cec/exynos_hdmi_cec.h
> diff --git a/drivers/staging/media/s5p-cec/exynos_hdmi_cecctrl.c b/drivers/media/platform/s5p-cec/exynos_hdmi_cecctrl.c
> similarity index 100%
> rename from drivers/staging/media/s5p-cec/exynos_hdmi_cecctrl.c
> rename to drivers/media/platform/s5p-cec/exynos_hdmi_cecctrl.c
> diff --git a/drivers/staging/media/s5p-cec/regs-cec.h b/drivers/media/platform/s5p-cec/regs-cec.h
> similarity index 100%
> rename from drivers/staging/media/s5p-cec/regs-cec.h
> rename to drivers/media/platform/s5p-cec/regs-cec.h
> diff --git a/drivers/staging/media/s5p-cec/s5p_cec.c b/drivers/media/platform/s5p-cec/s5p_cec.c
> similarity index 89%
> rename from drivers/staging/media/s5p-cec/s5p_cec.c
> rename to drivers/media/platform/s5p-cec/s5p_cec.c
> index 2a07968..2014f79 100644
> --- a/drivers/staging/media/s5p-cec/s5p_cec.c
> +++ b/drivers/media/platform/s5p-cec/s5p_cec.c
> @@ -14,15 +14,18 @@
>   */
>  
>  #include <linux/clk.h>
> +#include <linux/hpd-notifier.h>
>  #include <linux/interrupt.h>
>  #include <linux/kernel.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/timer.h>
>  #include <linux/workqueue.h>
> +#include <media/cec-edid.h>
>  #include <media/cec.h>
>  
>  #include "exynos_hdmi_cec.h"
> @@ -167,10 +170,22 @@ static const struct cec_adap_ops s5p_cec_adap_ops = {
>  static int s5p_cec_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> +	struct device_node *np;
> +	struct platform_device *hdmi_dev;
>  	struct resource *res;
>  	struct s5p_cec_dev *cec;
>  	int ret;
>  
> +	np = of_parse_phandle(pdev->dev.of_node, "samsung,hdmi-phandle", 0);
> +
> +	if (!np) {
> +		dev_err(&pdev->dev, "Failed to find hdmi node in device tree\n");
> +		return -ENODEV;
> +	}
> +	hdmi_dev = of_find_device_by_node(np);
> +	if (hdmi_dev == NULL)
> +		return -EPROBE_DEFER;
> +
>  	cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
>  	if (!cec)
>  		return -ENOMEM;
> @@ -200,24 +215,33 @@ static int s5p_cec_probe(struct platform_device *pdev)
>  	if (IS_ERR(cec->reg))
>  		return PTR_ERR(cec->reg);
>  
> +	cec->notifier = hpd_notifier_get(&hdmi_dev->dev);
> +	if (cec->notifier == NULL)
> +		return -ENOMEM;
> +
>  	cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec,
>  		CEC_NAME,
> -		CEC_CAP_PHYS_ADDR | CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
> +		CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
>  		CEC_CAP_PASSTHROUGH | CEC_CAP_RC, 1);
>  	ret = PTR_ERR_OR_ZERO(cec->adap);
>  	if (ret)
>  		return ret;
> +
>  	ret = cec_register_adapter(cec->adap, &pdev->dev);
> -	if (ret) {
> -		cec_delete_adapter(cec->adap);
> -		return ret;
> -	}
> +	if (ret)
> +		goto err_delete_adapter;
> +
> +	cec_register_hpd_notifier(cec->adap, cec->notifier);

Is there a reason to split registration into two steps?
Wouldn't be better to integrate hpd_notifier_get into
cec_register_hpd_notifier.

Regards
Andrzej