linux-kernel - Re: [PATCH 08/14] clk: sunxi-ng: v3s: add Allwinner V3 support

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Message-ID: <20190401081524.bickdv7kr4kcnsgm@flea>
Date:   Mon, 1 Apr 2019 10:15:24 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Icenowy Zheng <icenowy@...c.io>, Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 08/14] clk: sunxi-ng: v3s: add Allwinner V3 support

On Thu, Mar 28, 2019 at 08:27:21AM -0500, Rob Herring wrote:
> On Tue, Mar 12, 2019 at 11:22:50PM +0800, Icenowy Zheng wrote:
> > Allwinner V3 has the same main die with V3s, but with more pins wired.
> > There's a I2S bus on V3 that is not available on V3s.
> >
> > Add the V3-only peripheral's clocks and reset to the V3s CCU driver,
> > bound to a new V3 compatible string. The driver name is not changed
> > because it's part of the device tree binding (the header file name).
> >
> > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > ---
> >  drivers/clk/sunxi-ng/ccu-sun8i-v3s.c      | 225 +++++++++++++++++++++-
> >  drivers/clk/sunxi-ng/ccu-sun8i-v3s.h      |   2 +-
> >  include/dt-bindings/clock/sun8i-v3s-ccu.h |   4 +
> >  include/dt-bindings/reset/sun8i-v3s-ccu.h |   3 +
> >  4 files changed, 231 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> > index cbba04f5f761..81450ea8faa2 100644
> > --- a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> > +++ b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> > @@ -242,6 +242,8 @@ static SUNXI_CCU_GATE(bus_codec_clk,	"bus-codec",	"apb1",
> >  		      0x068, BIT(0), 0);
> >  static SUNXI_CCU_GATE(bus_pio_clk,	"bus-pio",	"apb1",
> >  		      0x068, BIT(5), 0);
> > +static SUNXI_CCU_GATE(bus_i2s0_clk,	"bus-i2s0",	"apb1",
> > +		      0x068, BIT(12), 0);
> >
> >  static SUNXI_CCU_GATE(bus_i2c0_clk,	"bus-i2c0",	"apb2",
> >  		      0x06c, BIT(0), 0);
> > @@ -313,6 +315,11 @@ static SUNXI_CCU_MP_WITH_MUX_GATE(spi0_clk, "spi0", mod0_default_parents, 0x0a0,
> >  				  BIT(31),	/* gate */
> >  				  0);
> >
> > +static const char * const i2s_parents[] = { "pll-audio-8x", "pll-audio-4x",
> > +					    "pll-audio-2x", "pll-audio" };
> > +static SUNXI_CCU_MUX_WITH_GATE(i2s0_clk, "i2s0", i2s_parents,
> > +			       0x0b0, 16, 2, BIT(31), CLK_SET_RATE_PARENT);
> > +
> >  static SUNXI_CCU_GATE(usb_phy0_clk,	"usb-phy0",	"osc24M",
> >  		      0x0cc, BIT(8), 0);
> >  static SUNXI_CCU_GATE(usb_ohci0_clk,	"usb-ohci0",	"osc24M",
> > @@ -445,6 +452,80 @@ static struct ccu_common *sun8i_v3s_ccu_clks[] = {
> >  	&mipi_csi_clk.common,
> >  };
> >
> > +static struct ccu_common *sun8i_v3_ccu_clks[] = {
>
> Seems like a bunch of duplication for just 2 differences in clocks.
> Can't you keep the definitions the same and just skip registering the
> clocks not present?

I'd rather not, this can lead to access to registers that might not be
there when the CCF will read / write that clock

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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