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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Chris Brandt <chris.brandt@renesas.com>
Cc: Mark Brown <broonie@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	linux-spi <linux-spi@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	Mason Yang <masonccyang@mxic.com.tw>,
	Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Subject: Re: [PATCH 2/6] ARM: dts: r7s72100: Add SPIBSC clocks
Date: Tue, 3 Dec 2019 19:42:49 +0100
Message-ID: <CAMuHMdXUVdG_PMQEpz=QWLCaabfK8Mc41zFiymXJ4Rx_C2gzdg@mail.gmail.com> (raw)
In-Reply-To: <20191203034519.5640-3-chris.brandt@renesas.com>

Hi Chris,

On Tue, Dec 3, 2019 at 4:46 AM Chris Brandt <chris.brandt@renesas.com> wrote:
> The SPIBSC-0 clock is marked as critical because for XIP systems, this
> is the SPI flash controller it will boot from and the kernel will also
> be running from so it cannot be turned off.
>
> Signed-off-by: Chris Brandt <chris.brandt@renesas.com>

Thanks for your patch!

> --- a/arch/arm/boot/dts/r7s72100.dtsi
> +++ b/arch/arm/boot/dts/r7s72100.dtsi
> @@ -101,6 +101,26 @@
>                 #size-cells = <1>;
>                 ranges;
>
> +               spibsc0: spi@3fefa000 {
> +                       compatible = "renesas,r7s72100-spibsc", "renesas,spibsc";
> +                       reg = <0x3fefa000 0x100>, <0x18000000 0x4000000>;

The second region conflicts with the XIP flash@18000000 in
arch/arm/boot/dts/r7s72100-gr-peach.dts.
Yes, I know it is the same device ;-)

> +                       clocks = <&mstp9_clks R7S72100_CLK_SPIBSC0>;
> +                       power-domains = <&cpg_clocks>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       status = "disabled";
> +               };
> +
> +               spibsc1: spi@3fefb000 {
> +                       compatible = "renesas,r7s72100-spibsc", "renesas,spibsc";
> +                       reg = <0x3fefb000 0x100>, <0x1c000000 0x4000000>;
> +                       clocks = <&mstp9_clks R7S72100_CLK_SPIBSC1>;
> +                       power-domains = <&cpg_clocks>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       status = "disabled";
> +               };
> +
>                 L2: cache-controller@3ffff000 {
>                         compatible = "arm,pl310-cache";
>                         reg = <0x3ffff000 0x1000>;
> @@ -467,11 +487,13 @@
>                         #clock-cells = <1>;
>                         compatible = "renesas,r7s72100-mstp-clocks", "renesas,cpg-mstp-clocks";
>                         reg = <0xfcfe0438 4>;
> -                       clocks = <&p0_clk>, <&p0_clk>, <&p0_clk>, <&p0_clk>;
> +                       clocks = <&p0_clk>, <&p0_clk>, <&p0_clk>, <&p0_clk>, <&b_clk>, <&b_clk>;
>                         clock-indices = <
>                                 R7S72100_CLK_I2C0 R7S72100_CLK_I2C1 R7S72100_CLK_I2C2 R7S72100_CLK_I2C3
> +                               R7S72100_CLK_SPIBSC0 R7S72100_CLK_SPIBSC1
>                         >;
> -                       clock-output-names = "i2c0", "i2c1", "i2c2", "i2c3";
> +                       clock-output-names = "i2c0", "i2c1", "i2c2", "i2c3", "spibsc0", "spibsc1";
> +                       clock-critical = <4>; /* spibsc0 */

Iff we go this clock-critical route, I think this should be specified in the
board-specific .dts instead of in the SoC-specific .dtsi.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

  reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03  3:45 [PATCH 0/6] spi: Add Renesas SPIBSC controller Chris Brandt
2019-12-03  3:45 ` [PATCH 1/6] clk: renesas: mstp: Add critical clock from device tree support Chris Brandt
2019-12-03 18:32   ` Geert Uytterhoeven
2019-12-03 18:46     ` Chris Brandt
2019-12-03 18:51       ` Geert Uytterhoeven
2019-12-03  3:45 ` [PATCH 2/6] ARM: dts: r7s72100: Add SPIBSC clocks Chris Brandt
2019-12-03 18:42   ` Geert Uytterhoeven [this message]
2019-12-03 18:57     ` Chris Brandt
2019-12-03 19:12       ` Geert Uytterhoeven
2019-12-04  8:38         ` Lee Jones
2019-12-04  9:03           ` Geert Uytterhoeven
2019-12-04  9:47             ` Lee Jones
2019-12-04 11:00               ` Chris Brandt
2019-12-03  3:45 ` [PATCH 3/6] clk: renesas: r7s9210: Add SPIBSC clock Chris Brandt
2019-12-03 18:49   ` Geert Uytterhoeven
2019-12-03 19:09     ` Chris Brandt
2019-12-03 20:40       ` Geert Uytterhoeven
2019-12-04  3:09         ` Chris Brandt
2019-12-03  3:45 ` [PATCH 4/6] spi: Add SPIBSC driver Chris Brandt
2019-12-03 14:19   ` Mark Brown
2019-12-03 15:00     ` Chris Brandt
2019-12-03 18:29     ` Geert Uytterhoeven
2019-12-04 11:25       ` Mark Brown
2019-12-04 12:14         ` Geert Uytterhoeven
2019-12-04 15:51     ` Chris Brandt
2019-12-04 16:49       ` Mark Brown
2019-12-03 18:28   ` Geert Uytterhoeven
2019-12-04 11:18     ` Mark Brown
2019-12-04 22:12     ` Chris Brandt
2019-12-03  3:45 ` [PATCH 5/6] ARM: dts: r7s9210: Add SPIBSC Device support Chris Brandt
2019-12-03 18:59   ` Geert Uytterhoeven
2019-12-03 22:38     ` Chris Brandt
2019-12-04  7:57       ` Geert Uytterhoeven
2019-12-04 11:04         ` Chris Brandt
2019-12-03  3:45 ` [PATCH 6/6] dt-bindings: spi: Document Renesas SPIBSC bindings Chris Brandt
2019-12-03  9:14   ` Sergei Shtylyov
2019-12-03 13:27     ` Chris Brandt
2019-12-03 16:04       ` Sergei Shtylyov
2019-12-03 16:35         ` Chris Brandt
2019-12-03 18:57   ` Geert Uytterhoeven
2019-12-03 20:39     ` Geert Uytterhoeven
2019-12-04  2:54       ` Chris Brandt
2019-12-04  8:56         ` Geert Uytterhoeven
2019-12-04 13:31           ` Chris Brandt
2019-12-05 15:48             ` Geert Uytterhoeven
2019-12-05 16:00               ` Chris Brandt
2019-12-04  8:40       ` Geert Uytterhoeven
2019-12-03 22:33     ` Chris Brandt
2019-12-04  8:43       ` Geert Uytterhoeven
2019-12-04 11:19         ` Chris Brandt

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