From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kishon Vijay Abraham I <kishon@ti.com>
Date: Fri, 28 Jun 2013 09:39:26 +0000
Subject: Re: [PATCH 3/3] video: exynos_dp: Use the generic PHY driver
Message-Id: <51CD56FE.4020302@ti.com>
List-Id: <linux-fbdev.vger.kernel.org>
References: <001701ce73bf$bebf9f20$3c3edd60$@samsung.com>
 <51CD25F2.5010206@ti.com> <001c01ce73c5$552e1cc0$ff8a5640$@samsung.com>
In-Reply-To: <001c01ce73c5$552e1cc0$ff8a5640$@samsung.com>
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To: linux-arm-kernel@lists.infradead.org

Hi,

On Friday 28 June 2013 11:34 AM, Jingoo Han wrote:
> On Friday, June 28, 2013 2:58 PM, Kishon Vijay Abraham I wrote:
>>
>> Hi,
>>
>> On Friday 28 June 2013 10:54 AM, Jingoo Han wrote:
>>> Use the generic PHY API instead of the platform callback to control
>>> the DP PHY. The 'phy_label' field is added to the platform data
>>> structure to allow PHY lookup on non-dt platforms.
>>>
>>> Signed-off-by: Jingoo Han <jg1.han@samsung.com>
>>> ---
>>>    .../devicetree/bindings/video/exynos_dp.txt        |   17 ---
>>>    drivers/video/exynos/exynos_dp_core.c              |  118 ++------------------
>>>    drivers/video/exynos/exynos_dp_core.h              |    2 +
>>>    include/video/exynos_dp.h                          |    6 +-
>>>    4 files changed, 15 insertions(+), 128 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/video/exynos_dp.txt
>> b/Documentation/devicetree/bindings/video/exynos_dp.txt
>>> index 84f10c1..a8320e3 100644
>>> --- a/Documentation/devicetree/bindings/video/exynos_dp.txt
>>> +++ b/Documentation/devicetree/bindings/video/exynos_dp.txt
>>> @@ -1,17 +1,6 @@
>>>    The Exynos display port interface should be configured based on
>>>    the type of panel connected to it.
>>>
>>> -We use two nodes:
>>> -	-dp-controller node
>>> -	-dptx-phy node(defined inside dp-controller node)
>>> -
>>> -For the DP-PHY initialization, we use the dptx-phy node.
>>> -Required properties for dptx-phy:
>>> -	-reg:
>>> -		Base address of DP PHY register.
>>> -	-samsung,enable-mask:
>>> -		The bit-mask used to enable/disable DP PHY.
>>> -
>>>    For the Panel initialization, we read data from dp-controller node.
>>>    Required properties for dp-controller:
>>>    	-compatible:
>>> @@ -67,12 +56,6 @@ SOC specific portion:
>>>    		interrupt-parent = <&combiner>;
>>>    		clocks = <&clock 342>;
>>>    		clock-names = "dp";
>>> -
>>> -		dptx-phy {
>>> -			reg = <0x10040720>;
>>> -			samsung,enable-mask = <1>;
>>> -		};
>>> -
>>>    	};
>>>
>>>    Board Specific portion:
>>> diff --git a/drivers/video/exynos/exynos_dp_core.c b/drivers/video/exynos/exynos_dp_core.c
>>> index 12bbede..bac515b 100644
>>> --- a/drivers/video/exynos/exynos_dp_core.c
>>> +++ b/drivers/video/exynos/exynos_dp_core.c
>>> @@ -19,6 +19,7 @@
>>>    #include <linux/interrupt.h>
>>>    #include <linux/delay.h>
>>>    #include <linux/of.h>
>>> +#include <linux/phy/phy.h>
>>>
>>>    #include <video/exynos_dp.h>
>>>
>>> @@ -960,84 +961,15 @@ static struct exynos_dp_platdata *exynos_dp_dt_parse_pdata(struct device *dev)
>>>    		return ERR_PTR(-EINVAL);
>>>    	}
>>>
>>> -	return pd;
>>> -}
>>> -
>>> -static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
>>> -{
>>> -	struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
>>> -	u32 phy_base;
>>> -	int ret = 0;
>>> -
>>> -	dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
>>> -	if (!dp_phy_node) {
>>> -		dev_err(dp->dev, "could not find dptx-phy node\n");
>>> -		return -ENODEV;
>>> -	}
>>> -
>>> -	if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
>>> -		dev_err(dp->dev, "failed to get reg for dptx-phy\n");
>>> -		ret = -EINVAL;
>>> -		goto err;
>>> -	}
>>> -
>>> -	if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
>>> -				&dp->enable_mask)) {
>>> -		dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
>>> -		ret = -EINVAL;
>>> -		goto err;
>>> -	}
>>> -
>>> -	dp->phy_addr = ioremap(phy_base, SZ_4);
>>> -	if (!dp->phy_addr) {
>>> -		dev_err(dp->dev, "failed to ioremap dp-phy\n");
>>> -		ret = -ENOMEM;
>>> -		goto err;
>>> -	}
>>> -
>>> -err:
>>> -	of_node_put(dp_phy_node);
>>> -
>>> -	return ret;
>>> -}
>>> -
>>> -static void exynos_dp_phy_init(struct exynos_dp_device *dp)
>>> -{
>>> -	u32 reg;
>>> -
>>> -	reg = __raw_readl(dp->phy_addr);
>>> -	reg |= dp->enable_mask;
>>> -	__raw_writel(reg, dp->phy_addr);
>>> -}
>>> -
>>> -static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
>>> -{
>>> -	u32 reg;
>>> +	pd->phy_label = "dp";
>>
>> In the case of non-dt boot, this phy_label should have ideally come from
>> platform code.
>
> No, this is NOT the case of non-dt.
>
> 'pd->phy_label = "dp";' is included in exynos_dp_dt_parse_pdata(),
> not exynos_dp_phy_exit().
> Also, exynos_dp_dt_parse_pdata() is called in the case of dt.

ah.. right. Do you support non-dt boot. I dont see any modifications in
the platform code?

Thanks
Kishon