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Date:   Thu, 6 May 2021 20:13:24 -0500
From:   Rob Herring <robh@kernel.org>
To:     Steven Lee <steven_lee@aspeedtech.com>
Cc:     Andrew Jeffery <andrew@aj.id.au>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Joel Stanley <joel@jms.id.au>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Ryan Chen <ryanchen.aspeed@gmail.com>,
        "moderated list:ASPEED SD/MMC DRIVER" <linux-aspeed@lists.ozlabs.org>,
        "moderated list:ASPEED SD/MMC DRIVER" <openbmc@lists.ozlabs.org>,
        "open list:ASPEED SD/MMC DRIVER" <linux-mmc@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>, Hongweiz@ami.com,
        ryan_chen@aspeedtech.com, chin-ting_kuo@aspeedtech.com
Subject: Re: [PATCH v3 1/5] dt-bindings: mmc: sdhci-of-aspeed: Add an example
 for AST2600-A2 EVB
Message-ID: <20210507011324.GA1119409@robh.at.kernel.org>
References: <20210506100312.1638-1-steven_lee@aspeedtech.com>
 <20210506100312.1638-2-steven_lee@aspeedtech.com>
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In-Reply-To: <20210506100312.1638-2-steven_lee@aspeedtech.com>
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On Thu, May 06, 2021 at 06:03:08PM +0800, Steven Lee wrote:
> AST2600-A2 EVB has the reference design for enabling SD bus
> power and toggling SD bus signal voltage by GPIO pins.
> 
> In the reference design, GPIOV0 of AST2600-A2 EVB is connected to
> power load switch that providing 3.3v to SD1 bus vdd. GPIOV1 is
> connected to a 1.8v and a 3.3v power load switch that providing
> signal voltage to
> SD1 bus.
> 
> If GPIOV0 is active high, SD1 bus is enabled. Otherwise, SD1 bus is
> disabled.
> If GPIOV1 is active high, 3.3v power load switch is enabled, SD1
> signal voltage is 3.3v. Otherwise, 1.8v power load switch will be
> enabled, SD1 signal voltage becomes 1.8v.
> 
> AST2600-A2 EVB also support toggling signal voltage for SD2 bus.
> The design is the same as SD1 bus. It uses GPIOV2 as power-gpio and
> GPIOV3 as power-switch-gpio.
> 
> Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
> ---
>  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 101 +++++++++++++++++-
>  1 file changed, 97 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> index 987b287f3bff..de7e61b3d37a 100644
> --- a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> @@ -45,10 +45,16 @@ patternProperties:
>  
>      properties:
>        compatible:
> -        enum:
> -          - aspeed,ast2400-sdhci
> -          - aspeed,ast2500-sdhci
> -          - aspeed,ast2600-sdhci
> +        oneOf:
> +          - items:
> +              - enum:
> +                  - aspeed,ast2400-sdhci
> +                  - aspeed,ast2500-sdhci
> +                  - aspeed,ast2600-sdhci
> +          - items:
> +              - enum:
> +                  - aspeed,ast2600-sdhci
> +              - const: sdhci

Why are you adding 'sdhci'. That's not useful as a compatible given how 
many quirks different implementations have.


>        reg:
>          maxItems: 1
>          description: The SDHCI registers
> @@ -104,3 +110,90 @@ examples:
>                      clocks = <&syscon ASPEED_CLK_SDIO>;
>              };
>      };
> +
> +  - |

Why do we need another example?

> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    vcc_sdhci0: regulator-vcc-sdhci0 {
> +            compatible = "regulator-fixed";
> +            regulator-name = "SDHCI0 Vcc";
> +            regulator-min-microvolt = <3300000>;
> +            regulator-max-microvolt = <3300000>;
> +            gpios = <&gpio0 168
> +                            GPIO_ACTIVE_HIGH>;
> +            enable-active-high;
> +    };
> +
> +    vccq_sdhci0: regulator-vccq-sdhci0 {
> +            compatible = "regulator-gpio";
> +
> +            regulator-name = "SDHCI0 VccQ";
> +            regulator-min-microvolt = <1800000>;
> +            regulator-max-microvolt = <3300000>;
> +            gpios = <&gpio0 169
> +                            GPIO_ACTIVE_HIGH>;
> +            gpios-states = <1>;
> +            states = <3300000 1>,
> +                     <1800000 0>;
> +    };
> +
> +    vcc_sdhci1: regulator-vcc-sdhci1 {
> +            compatible = "regulator-fixed";
> +
> +            regulator-name = "SDHCI1 Vcc";
> +            regulator-min-microvolt = <3300000>;
> +            regulator-max-microvolt = <3300000>;
> +            gpios = <&gpio0 170
> +                            GPIO_ACTIVE_HIGH>;
> +            enable-active-high;
> +    };
> +
> +    vccq_sdhci1: regulator-vccq-sdhci1 {
> +            compatible = "regulator-gpio";
> +
> +            regulator-name = "SDHCI1 VccQ";
> +            regulator-min-microvolt = <1800000>;
> +            regulator-max-microvolt = <3300000>;
> +            gpios = <&gpio0 171
> +                            GPIO_ACTIVE_HIGH>;
> +            gpios-states = <1>;
> +            states = <3300000 1>,
> +                     <1800000 0>;
> +    };
> +
> +    sdc@1e740000 {
> +            compatible = "aspeed,ast2600-sd-controller";
> +            reg = <0x1e740000 0x100>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +            ranges = <0 0x1e740000 0x20000>;
> +            clocks = <&syscon ASPEED_CLK_GATE_SDCLK>;
> +
> +            sdhci@1e740100 {
> +                    compatible = "aspeed,ast2600-sdhci","sdhci";
> +                    reg = <0x100 0x100>;
> +                    interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
> +                    sdhci,auto-cmd12;
> +                    clocks = <&syscon ASPEED_CLK_SDIO>;
> +                    vmmc-supply = <&vcc_sdhci0>;
> +                    vqmmc-supply = <&vccq_sdhci0>;
> +                    sd-uhs-sdr104;
> +                    clk-phase-uhs-sdr104 = <180>, <180>;
> +            };
> +
> +            sdhci@1e740200 {
> +                    compatible = "aspeed,ast2600-sdhci","sdhci";
> +                    reg = <0x200 0x100>;
> +                    interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
> +                    sdhci,auto-cmd12;
> +                    clocks = <&syscon ASPEED_CLK_SDIO>;
> +                    vmmc-supply = <&vcc_sdhci1>;
> +                    vqmmc-supply = <&vccq_sdhci1>;
> +                    sd-uhs-sdr104;
> +                    clk-phase-uhs-sdr104 = <0>, <0>;
> +            };
> +    };
> +
> +...
> -- 
> 2.17.1
>