netdev - Re: [PATCH v2 05/13] pinctrl: sunxi: Prepare for alternative bias voltage setting methods

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Date:   Tue, 9 Apr 2019 10:43:51 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     megous@...ous.com
Cc:     linux-sunxi@...glegroups.com, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Naveen Gupta <naveen.gupta@...ress.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 05/13] pinctrl: sunxi: Prepare for alternative bias
 voltage setting methods

Hi,

On Tue, Apr 09, 2019 at 02:24:44AM +0200, megous@...ous.com wrote:
> From: Ondrej Jirman <megous@...ous.com>
>
> H6 has a different I/O voltage bias setting method than A80. Prepare
> existing code for using alternative bias voltage setting methods.
>
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
>  drivers/pinctrl/sunxi/pinctrl-sun9i-a80.c |  2 +-
>  drivers/pinctrl/sunxi/pinctrl-sunxi.c     | 41 +++++++++++++----------
>  drivers/pinctrl/sunxi/pinctrl-sunxi.h     |  5 ++-
>  3 files changed, 28 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sun9i-a80.c b/drivers/pinctrl/sunxi/pinctrl-sun9i-a80.c
> index da37d594a13d..3aa210079b18 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sun9i-a80.c
> +++ b/drivers/pinctrl/sunxi/pinctrl-sun9i-a80.c
> @@ -722,7 +722,7 @@ static const struct sunxi_pinctrl_desc sun9i_a80_pinctrl_data = {
>  	.npins = ARRAY_SIZE(sun9i_a80_pins),
>  	.irq_banks = 5,
>  	.disable_strict_mode = true,
> -	.has_io_bias_cfg = true,
> +	.io_bias_cfg_variant = IO_BIAS_CFG_V1,
>  };
>
>  static int sun9i_a80_pinctrl_probe(struct platform_device *pdev)
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> index 8dd25caea2cf..b8dd58ef33b7 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> @@ -610,7 +610,7 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
>  	u32 val, reg;
>  	int uV;
>
> -	if (!pctl->desc->has_io_bias_cfg)
> +	if (!pctl->desc->io_bias_cfg_variant)
>  		return 0;
>
>  	uV = regulator_get_voltage(supply);
> @@ -621,23 +621,28 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
>  	if (uV == 0)
>  		return 0;
>
> -	/* Configured value must be equal or greater to actual voltage */
> -	if (uV <= 1800000)
> -		val = 0x0; /* 1.8V */
> -	else if (uV <= 2500000)
> -		val = 0x6; /* 2.5V */
> -	else if (uV <= 2800000)
> -		val = 0x9; /* 2.8V */
> -	else if (uV <= 3000000)
> -		val = 0xA; /* 3.0V */
> -	else
> -		val = 0xD; /* 3.3V */
> -
> -	pin -= pctl->desc->pin_base;
> -
> -	reg = readl(pctl->membase + sunxi_grp_config_reg(pin));
> -	reg &= ~IO_BIAS_MASK;
> -	writel(reg | val, pctl->membase + sunxi_grp_config_reg(pin));
> +	if (pctl->desc->io_bias_cfg_variant == IO_BIAS_CFG_V1) {
> +		/*
> +		 * Configured value must be equal or greater to actual
> +		 * voltage.
> +		 */
> +		if (uV <= 1800000)
> +			val = 0x0; /* 1.8V */
> +		else if (uV <= 2500000)
> +			val = 0x6; /* 2.5V */
> +		else if (uV <= 2800000)
> +			val = 0x9; /* 2.8V */
> +		else if (uV <= 3000000)
> +			val = 0xA; /* 3.0V */
> +		else
> +			val = 0xD; /* 3.3V */
> +
> +		pin -= pctl->desc->pin_base;
> +
> +		reg = readl(pctl->membase + sunxi_grp_config_reg(pin));
> +		reg &= ~IO_BIAS_MASK;
> +		writel(reg | val, pctl->membase + sunxi_grp_config_reg(pin));
> +	}
>
>  	return 0;
>  }
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.h b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> index ee15ab067b5f..642f667e99d2 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
> @@ -95,6 +95,9 @@
>  #define PINCTRL_SUN7I_A20	BIT(7)
>  #define PINCTRL_SUN8I_R40	BIT(8)
>
> +/* Bias voltage configuration done via Pn_GRP_CONFIG registers. */
> +#define IO_BIAS_CFG_V1		1
> +

Can we turn this into an enum, and give them proper name? Mentionning
an example in the commit would be great too.

Something like:

enum sunxi_desc_bias_voltage {
        /* Bias Voltage configuration is done through Pn_GRP_CONFIG registers, as seen on the A83t */
	BIAS_VOLTAGE_GRP_CONFIG,
};

etc.

Thanks!
Maxime

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

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