linux-kernel - Re: [v5 2/3] drm/mediatek: separate mipi

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Date:   Fri, 28 Jun 2019 10:02:51 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Jitao Shi <jitao.shi@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
        "Mark Rutland" <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        <linux-pwm@...r.kernel.org>, David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Thierry Reding" <treding@...dia.com>,
        Ajay Kumar <ajaykumar.rs@...sung.com>,
        "Inki Dae" <inki.dae@...sung.com>,
        Rahul Sharma <rahul.sharma@...sung.com>,
        "Sean Paul" <seanpaul@...omium.org>,
        Vincent Palatin <vpalatin@...omium.org>,
        "Andy Yan" <andy.yan@...k-chips.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <rmk+kernel@....linux.org.uk>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        <yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
        <cawa.cheng@...iatek.com>, <bibby.hsieh@...iatek.com>,
        <stonea168@....com>
Subject: Re: [v5 2/3] drm/mediatek: separate mipi_tx to different file

Hi, Jitao:

On Thu, 2019-06-27 at 10:59 +0800, Jitao Shi wrote:
> Different IC has different mipi_tx setting of dsi.
> This patch separates the mipi_tx hardware relate part for mt8173.
> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> Reviewed-by: CK Hu <ck.hu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/Makefile             |   1 +
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.c        | 343 ++----------------
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.h        |  49 +++
>  drivers/gpu/drm/mediatek/mtk_mt8173_mipi_tx.c | 289 +++++++++++++++
>  4 files changed, 363 insertions(+), 319 deletions(-)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_mipi_tx.h
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_mt8173_mipi_tx.c
> 

[snip]

> @@ -391,10 +101,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct mtk_mipi_tx *mipi_tx;
>  	struct resource *mem;
> -	struct clk *ref_clk;
>  	const char *ref_clk_name;
>  	struct clk_init_data clk_init = {
> -		.ops = &mtk_mipi_tx_pll_ops,
>  		.num_parents = 1,
>  		.parent_names = (const char * const *)&ref_clk_name,
>  		.flags = CLK_SET_RATE_GATE,
> @@ -408,6 +116,7 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	mipi_tx->driver_data = of_device_get_match_data(dev);
> +
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	mipi_tx->regs = devm_ioremap_resource(dev, mem);
>  	if (IS_ERR(mipi_tx->regs)) {
> @@ -416,13 +125,14 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	ref_clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(ref_clk)) {
> -		ret = PTR_ERR(ref_clk);
> +	mipi_tx->ref_clk = devm_clk_get(dev, NULL);

I think you need not to keep ref_clk in driver private data because you
would not use it any more.

Regards,
CK

> +	if (IS_ERR(mipi_tx->ref_clk)) {
> +		ret = PTR_ERR(mipi_tx->ref_clk);
>  		dev_err(dev, "Failed to get reference clock: %d\n", ret);
>  		return ret;
>  	}
> -	ref_clk_name = __clk_get_name(ref_clk);
> +
> +	ref_clk_name = __clk_get_name(mipi_tx->ref_clk);
>  
>  	ret = of_property_read_string(dev->of_node, "clock-output-names",
>  				      &clk_init.name);
> @@ -431,6 +141,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	clk_init.ops = mipi_tx->driver_data->mipi_tx_clk_ops;
> +
>  	mipi_tx->pll_hw.init = &clk_init;
>  	mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw);
>  	if (IS_ERR(mipi_tx->pll)) {
> @@ -465,20 +177,12 @@ static int mtk_mipi_tx_remove(struct platform_device *pdev)
>  	return 0;
>  }
>