linux-kernel - Re: [PATCH 1/2] ARM: dts: omap3-igep0020: Use MMC pwrseq to init SDIO WiFi

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Message-ID: <CAFqH_50v7gkxWqwVMLtwn9g5WTRF7k16_r1Xaztt3GC4wO9wiA@mail.gmail.com>
Date:	Fri, 4 Dec 2015 15:36:52 +0100
From:	Enric Balletbo Serra <eballetbo@...il.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] ARM: dts: omap3-igep0020: Use MMC pwrseq to init SDIO WiFi

2015-12-03 19:02 GMT+01:00 Javier Martinez Canillas <javier@....samsung.com>:
> When the WiFi support was added to the IGEP0020 board, the MMC subsystem
> did not provide a mechanism to define power sequence providers. So a DT
> hack was used to toggle the WiFi chip reset and power down pins by using
> fake fixed regulators whose enable GPIO was the GPIOs connected to these
> pins.
>
> But now the simple MMC power sequence provider can be used for this and
> the workaround removed.
>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
>
>  arch/arm/boot/dts/omap3-igep0020.dts | 24 ++++++++----------------
>  1 file changed, 8 insertions(+), 16 deletions(-)
>
> diff --git a/arch/arm/boot/dts/omap3-igep0020.dts b/arch/arm/boot/dts/omap3-igep0020.dts
> index 3835e1569c29..33d6b4ead092 100644
> --- a/arch/arm/boot/dts/omap3-igep0020.dts
> +++ b/arch/arm/boot/dts/omap3-igep0020.dts
> @@ -15,25 +15,17 @@
>         model = "IGEPv2 Rev. C (TI OMAP AM/DM37x)";
>         compatible = "isee,omap3-igep0020", "ti,omap36xx", "ti,omap3";
>
> -       /* Regulator to trigger the WIFI_PDN signal of the Wifi module */
> -       lbee1usjyc_pdn: lbee1usjyc_pdn {
> +       vmmcsdio_fixed: fixedregulator-mmcsdio {
>                 compatible = "regulator-fixed";
> -               regulator-name = "regulator-lbee1usjyc-pdn";
> +               regulator-name = "vmmcsdio_fixed";
>                 regulator-min-microvolt = <3300000>;
>                 regulator-max-microvolt = <3300000>;
> -               gpio = <&gpio5 10 GPIO_ACTIVE_HIGH>;    /* gpio_138 - WIFI_PDN */
> -               startup-delay-us = <10000>;
> -               enable-active-high;
>         };
>
> -       /* Regulator to trigger the RESET_N_W signal of the Wifi module */
> -       lbee1usjyc_reset_n_w: lbee1usjyc_reset_n_w {
> -               compatible = "regulator-fixed";
> -               regulator-name = "regulator-lbee1usjyc-reset-n-w";
> -               regulator-min-microvolt = <3300000>;
> -               regulator-max-microvolt = <3300000>;
> -               gpio = <&gpio5 11 GPIO_ACTIVE_HIGH>;    /* gpio_139 - RESET_N_W */
> -               enable-active-high;
> +       mmc2_pwrseq: mmc2_pwrseq {
> +               compatible = "mmc-pwrseq-simple";
> +               reset-gpios = <&gpio5 11 GPIO_ACTIVE_LOW>,      /* gpio_139 - RESET_N_W */
> +                             <&gpio5 10 GPIO_ACTIVE_LOW>;      /* gpio_138 - WIFI_PDN */
>         };
>  };
>
> @@ -51,8 +43,8 @@
>  &mmc2 {
>         pinctrl-names = "default";
>         pinctrl-0 = <&mmc2_pins &lbee1usjyc_pins>;
> -       vmmc-supply = <&lbee1usjyc_pdn>;
> -       vmmc_aux-supply = <&lbee1usjyc_reset_n_w>;
> +       vmmc-supply = <&vmmcsdio_fixed>;
> +       mmc-pwrseq = <&mmc2_pwrseq>;
>         bus-width = <4>;
>         non-removable;
>  };
> --
> 2.4.3
>

I also tested these patches

Acked-by: Enric Balletbo Serra <enric.balletbo@...labora.com>
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