linux-kernel - Re: [PATCH v1 3/3] riscv: dts: starfive: Add mmc node

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Date:   Wed, 7 Dec 2022 16:31:03 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        William Qiu <william.qiu@...rfivetech.com>
Cc:     William Qiu <william.qiu@...rfivetech.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-mmc@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] riscv: dts: starfive: Add mmc node

On Wed, Dec 07, 2022 at 04:14:53PM +0100, Krzysztof Kozlowski wrote:
> On 07/12/2022 14:17, William Qiu wrote:
> > This adds the mmc node for the StarFive JH7110 SoC.
> > Set sdioo node to emmc and set sdio1 node to sd.
> > 
> > Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
> > ---
> >  .../jh7110-starfive-visionfive-v2.dts         | 25 ++++++++++++
> >  arch/riscv/boot/dts/starfive/jh7110.dtsi      | 38 +++++++++++++++++++
> >  2 files changed, 63 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> > index c8946cf3a268..6ef8e303c2e6 100644
> > --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> > +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> > @@ -47,6 +47,31 @@ &clk_rtc {
> >  	clock-frequency = <32768>;
> >  };
> >  
> > +&sdio0 {
> > +	max-frequency = <100000000>;
> > +	card-detect-delay = <300>;
> > +	bus-width = <8>;
> > +	cap-mmc-highspeed;
> > +	mmc-ddr-1_8v;
> > +	mmc-hs200-1_8v;
> > +	non-removable;
> > +	cap-mmc-hw-reset;
> > +	post-power-on-delay-ms = <200>;
> > +	status = "okay";
> > +};
> > +
> > +&sdio1 {
> > +	max-frequency = <100000000>;
> > +	card-detect-delay = <300>;
> > +	bus-width = <4>;
> > +	no-sdio;
> > +	no-mmc;
> > +	broken-cd;
> > +	cap-sd-highspeed;
> > +	post-power-on-delay-ms = <200>;
> > +	status = "okay";
> > +};
> > +
> >  &gmac0_rmii_refin {
> >  	clock-frequency = <50000000>;
> >  };
> > diff --git a/arch/riscv/boot/dts/starfive/jh7110.dtsi b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> > index c22e8f1d2640..e90b085d7e41 100644
> > --- a/arch/riscv/boot/dts/starfive/jh7110.dtsi
> > +++ b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> > @@ -331,6 +331,11 @@ aoncrg: clock-controller@...00000 {
> >  			#reset-cells = <1>;
> >  		};
> >  
> > +		sys_syscon: sys_syscon@...30000 {
> 
> No underscores in node names, generic node names (syscon or
> system-controller)
> 
> > +			compatible = "syscon";
> 
> This is not allowed alone.
> 
> > +			reg = <0x0 0x13030000 0x0 0x1000>;
> > +		};
> > +
> >  		gpio: gpio@...40000 {
> >  			compatible = "starfive,jh7110-sys-pinctrl";
> >  			reg = <0x0 0x13040000 0x0 0x10000>;
> > @@ -433,5 +438,38 @@ uart5: serial@...20000 {
> >  			reg-shift = <2>;
> >  			status = "disabled";
> >  		};
> > +
> > +		/* unremovable emmc as mmcblk0 */
> > +		sdio0: mmc@...10000 {
> > +			compatible = "starfive,jh7110-sdio";
> > +			reg = <0x0 0x16010000 0x0 0x10000>;
> > +			clocks = <&syscrg JH7110_SYSCLK_SDIO0_AHB>,
> > +				 <&syscrg JH7110_SYSCLK_SDIO0_SDCARD>;
> > +			clock-names = "biu","ciu";
> > +			resets = <&syscrg JH7110_SYSRST_SDIO0_AHB>;
> > +			reset-names = "reset";
> > +			interrupts = <74>;
> > +			fifo-depth = <32>;
> > +			fifo-watermark-aligned;
> > +			data-addr = <0>;
> > +			starfive,sys-syscon = <&sys_syscon 0x14 0x1a 0x7c000000>;
> 
> This does not match your bindings at all. "&sys_syscon" is a phandle,
> not a number of tuning retries, as you expect in your bindings.

Additionally, a Link: to the documentation for where-ever these "random"
numbers that are being used would be nice.

+static int dw_mci_starfive_parse_dt(struct dw_mci *host)
+{
+	struct of_phandle_args args;
+	struct starfive_priv *priv;
+	int ret;
+
+	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ret = of_parse_phandle_with_fixed_args(host->dev->of_node,
+						"starfive,sys-syscon", 3, 0, &args);
+	if (ret) {
+		dev_err(host->dev, "Failed to parse starfive,sys-syscon\n");
+		return -EINVAL;
+	}
+
+	priv->reg_syscon = syscon_node_to_regmap(args.np);
+	of_node_put(args.np);
+	if (IS_ERR(priv->reg_syscon))
+		return PTR_ERR(priv->reg_syscon);
+
+	priv->syscon_offset = args.args[0];
+	priv->syscon_shift  = args.args[1];
+	priv->syscon_mask   = args.args[2];

Given the driver, the property description just seems incorrect and this
is actually the bit of the syscon that is relevant to the tuning process
(perhaps where the find the tuning values?). Without public docs or a
better description it is hard for (me at least) to know :)

+
+	host->priv = priv;
+
+	return 0;
+}

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