linux-kernel - Re: [PATCH 3/3] pinctrl: bcm2835: bcm7211: Add support for 7211 pull-up functionality

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Message-ID: <eb73a935-3638-e7b5-c85e-7857d61a7511@i2se.com>
Date:   Mon, 13 May 2019 10:14:53 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Al Cooper <alcooperx@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Eric Anholt <eric@...olt.net>, Doug Berger <opendmb@...il.com>,
        Matheus Castello <matheus@...tello.eng.br>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Lukas Wunner <lukas@...ner.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        "open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] pinctrl: bcm2835: bcm7211: Add support for 7211
 pull-up functionality

Hi Florian,

On 09.05.19 22:59, Florian Fainelli wrote:
> From: Al Cooper <alcooperx@...il.com>
>
> The 7211 has a new way of selecting the pull-up/pull-down setting
> for a GPIO pin. The registers used for the bcm2837, GP_PUD and
> GP_PUDCLKn0, are no longer connected. A new set of registers,
> GP_GPIO_PUP_PDN_CNTRL_REGx must be used. This commit will add
> a new compatible string "brcm,bcm7211-gpio" and the kernel
> driver will use it to select which method is used to select
> pull-up/pull-down.
>
> Signed-off-by: Al Cooper <alcooperx@...il.com>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/pinctrl/bcm/pinctrl-bcm2835.c | 85 +++++++++++++++++++++++++--
>  1 file changed, 80 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> index 183d1ffe6a75..35d9f9593000 100644
> --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> @@ -57,15 +57,26 @@
>  #define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
>  #define GPPUD		0x94	/* Pin Pull-up/down Enable */
>  #define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
> +#define GP_GPIO_PUP_PDN_CNTRL_REG0 0xe4 /* 7211 Pin Pull-up/down select */
>  
>  #define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
>  #define FSEL_SHIFT(p)		(((p) % 10) * 3)
>  #define GPIO_REG_OFFSET(p)	((p) / 32)
>  #define GPIO_REG_SHIFT(p)	((p) % 32)
>  
> +#define PUD_7211_MASK		0x3
> +#define PUD_7211_REG_OFFSET(p)	((p) / 16)
> +#define PUD_7211_REG_SHIFT(p)	(((p) % 16) * 2)
> +
>  /* argument: bcm2835_pinconf_pull */
>  #define BCM2835_PINCONF_PARAM_PULL	(PIN_CONFIG_END + 1)
>  
> +enum bcm7211_pinconf_pull {
> +	BCM7211_PINCONFIG_PULL_NONE,
> +	BCM7211_PINCONFIG_PULL_UP,
> +	BCM7211_PINCONFIG_PULL_DOWN,
> +};

unfortunately this not usable for DTS files.

Please look at:
include/dt-bindings/pinctrl/bcm2835.h

Btw the meaning between BCM2835 and BCM7211 of pull down and up is
different :(