linux-kernel - Re: [PATCH v2 25/29] drm: sun4i: add quirks for TCON TOP

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Date:   Mon, 8 Oct 2018 17:06:45 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Icenowy Zheng <icenowy@...c.io>
Subject: Re: [PATCH v2 25/29] drm: sun4i: add quirks for TCON TOP

On Mon, Oct 8, 2018 at 4:51 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Sun, Oct 07, 2018 at 11:39:01AM +0200, Jernej Skrabec wrote:
> > From: Icenowy Zheng <icenowy@...c.io>
> >
> > Some SoCs, such as H6, doesn't have a full-featured TCON TOP.
> >
> > Add quirks support for TCON TOP.
> >
> > Currently the presence of TCON_TV1 and DSI is controlled via the quirks
> > structure.
> >
> > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > ---
> >  drivers/gpu/drm/sun4i/sun8i_tcon_top.c | 43 ++++++++++++++++++++------
> >  1 file changed, 34 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
> > index 37158548b447..ed13233cad88 100644
> > --- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
> > +++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
> > @@ -9,11 +9,17 @@
> >  #include <linux/component.h>
> >  #include <linux/device.h>
> >  #include <linux/module.h>
> > +#include <linux/of_device.h>
> >  #include <linux/of_graph.h>
> >  #include <linux/platform_device.h>
> >
> >  #include "sun8i_tcon_top.h"
> >
> > +struct sun8i_tcon_top_quirks {
> > +     bool has_tcon_tv1;
> > +     bool has_dsi;
> > +};
> > +
> >  static bool sun8i_tcon_top_node_is_tcon_top(struct device_node *node)
> >  {
> >       return !!of_match_node(sun8i_tcon_top_of_table, node);
> > @@ -121,10 +127,13 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
> >       struct platform_device *pdev = to_platform_device(dev);
> >       struct clk_hw_onecell_data *clk_data;
> >       struct sun8i_tcon_top *tcon_top;
> > +     const struct sun8i_tcon_top_quirks *quirks;
> >       struct resource *res;
> >       void __iomem *regs;
> >       int ret, i;
> >
> > +     quirks = of_device_get_match_data(&pdev->dev);
> > +
> >       tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL);
> >       if (!tcon_top)
> >               return -ENOMEM;
> > @@ -187,15 +196,23 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
> >                                            &tcon_top->reg_lock,
> >                                            TCON_TOP_TCON_TV0_GATE, 0);
> >
> > -     clk_data->hws[CLK_TCON_TOP_TV1] =
> > -             sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs,
> > -                                          &tcon_top->reg_lock,
> > -                                          TCON_TOP_TCON_TV1_GATE, 1);
> > +     if (quirks->has_tcon_tv1) {
> > +             clk_data->hws[CLK_TCON_TOP_TV1] =
> > +                     sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs,
> > +                                                  &tcon_top->reg_lock,
> > +                                                  TCON_TOP_TCON_TV1_GATE, 1);
> > +     } else {
> > +             clk_data->hws[CLK_TCON_TOP_TV1] = NULL;
> > +     }
> >
> > -     clk_data->hws[CLK_TCON_TOP_DSI] =
> > -             sun8i_tcon_top_register_gate(dev, "dsi", regs,
> > -                                          &tcon_top->reg_lock,
> > -                                          TCON_TOP_TCON_DSI_GATE, 2);
> > +     if (quirks->has_dsi) {
> > +             clk_data->hws[CLK_TCON_TOP_DSI] =
> > +                     sun8i_tcon_top_register_gate(dev, "dsi", regs,
> > +                                                  &tcon_top->reg_lock,
> > +                                                  TCON_TOP_TCON_DSI_GATE, 2);
> > +     } else {
> > +             clk_data->hws[CLK_TCON_TOP_DSI] = NULL;
>
> clk_data has been kzalloc'd so its content is already NULL.
>
> And you shouldn't have brackets for single line blocks.
>
> with that fixed,

FYI checkpatch.pl complains if you use brackets for the if block
but not for the else block. They should be matching.

ChenYu

> Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>
>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com