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Date: Sun, 22 Apr 2018 14:44:06 +0200 (CEST)
From: Stefan Wahren <stefan.wahren@...e.com>
To: Matheus Castello <matheus@...tello.eng.br>
Cc: linus.walleij@...aro.org, robh+dt@...nel.org, eric@...olt.net,
mark.rutland@....com, devicetree@...r.kernel.org, robh@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] pinctrl: bcm2835: Add support for generic
pinctrl binding
Hi Matheus,
> Matheus Castello <matheus@...tello.eng.br> hat am 11. April 2018 um 06:58 geschrieben:
>
>
> To keep driver up to date we add generic pinctrl binding support, which covers
> the features used in this driver and has additional node properties that this
> SoC has compatibility, so enabling future implementations of these properties
> without the need to create new node properties in the device trees.
>
> The logic of this change maintain the old brcm legacy binding support in order
> to keep the ABI stable.
>
> Signed-off-by: Matheus Castello <matheus@...tello.eng.br>
> ---
>
> A brief explanation of what I did:
>
> Add pinconf-generic header for use the defines and pinctrl-generic API.
>
> Add dt-bindings pinctrl bcm2835 header to use functions selections and
> pulls definitions, which functions definitions where duplicated in the
> enum bcm2835_fsel, I removed the duplicate defines from enum.
>
> In the bcm2835_pctl_dt_node_to_map_pull I used the generic macro for
> pack the legacy param and arguments, since it will be unpacked along with
> generic properties that is packed with this same macro.
>
> In bcm2835_pctl_dt_node_to_map I thougt it was better, and simpler, to use
> pinctrl-generic parse code instead of parsing it inside the driver, so code
> first check for generic binding parse, if something is parsed then it is
> assumed that are using the new generic style, and when nothing is found then
> parse continues to search for legacy properties.
>
> In the bcm2835_pinconf_set was changed the unpack legacy by the generic, and
> was added a switch for the parameter tests, since pinctrl generic uses 3
> properties to define the states of the pull instead of one with arguments, that
> was the reason too that bcm2835_pull_config_set function was added, for reuse
> the code that set state of pull.
>
> drivers/pinctrl/bcm/Kconfig | 1 +
> drivers/pinctrl/bcm/pinctrl-bcm2835.c | 87 ++++++++++++++++++++++-------------
> 2 files changed, 55 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
> index e8c4e4f..0f38d51 100644
> --- a/drivers/pinctrl/bcm/Kconfig
> +++ b/drivers/pinctrl/bcm/Kconfig
> @@ -20,6 +20,7 @@ config PINCTRL_BCM2835
> bool
> select PINMUX
> select PINCONF
> + select GENERIC_PINCONF
> select GPIOLIB_IRQCHIP
>
> config PINCTRL_IPROC_GPIO
> diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> index 785c366..010c565 100644
> --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> ...
> @@ -917,37 +913,62 @@ static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
> return -ENOTSUPP;
> }
>
> +static void bcm2835_pull_config_set(struct bcm2835_pinctrl *pc,
> + unsigned pin, unsigned arg)
checkpatch is complaining about missing "int" here. Please fix this here.
> +{
> + u32 off, bit;
> +
> + off = GPIO_REG_OFFSET(pin);
> + bit = GPIO_REG_SHIFT(pin);
> +
> + bcm2835_gpio_wr(pc, GPPUD, arg & 3);
> + /*
> + * BCM2835 datasheet say to wait 150 cycles, but not of what.
> + * But the VideoCore firmware delay for this operation
> + * based nearly on the same amount of VPU cycles and this clock
> + * runs at 250 MHz.
> + */
checkpatch complains here about comment alignment. Please fix it.
Stefan
> + udelay(1);
> + bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
> + udelay(1);
> + bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
> +}
> +
> static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
> unsigned pin, unsigned long *configs,
> unsigned num_configs)
> {
> struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
> - enum bcm2835_pinconf_param param;
> - u16 arg;
> - u32 off, bit;
> + u32 param, arg;
> int i;
>
> for (i = 0; i < num_configs; i++) {
> - param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
> - arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
> + param = pinconf_to_config_param(configs[i]);
> + arg = pinconf_to_config_argument(configs[i]);
>
> - if (param != BCM2835_PINCONF_PARAM_PULL)
> - return -EINVAL;
> + switch (param) {
> + /* Set legacy brcm,pull */
> + case BCM2835_PINCONF_PARAM_PULL:
> + bcm2835_pull_config_set(pc, pin, arg);
> + break;
>
> - off = GPIO_REG_OFFSET(pin);
> - bit = GPIO_REG_SHIFT(pin);
> + /* Set pull generic bindings */
> + case PIN_CONFIG_BIAS_DISABLE:
> + bcm2835_pull_config_set(pc, pin, BCM2835_PUD_OFF);
> + break;
>
> - bcm2835_gpio_wr(pc, GPPUD, arg & 3);
> - /*
> - * BCM2835 datasheet say to wait 150 cycles, but not of what.
> - * But the VideoCore firmware delay for this operation
> - * based nearly on the same amount of VPU cycles and this clock
> - * runs at 250 MHz.
> - */
> - udelay(1);
> - bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
> - udelay(1);
> - bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
> + case PIN_CONFIG_BIAS_PULL_DOWN:
> + bcm2835_pull_config_set(pc, pin, BCM2835_PUD_DOWN);
> + break;
> +
> + case PIN_CONFIG_BIAS_PULL_UP:
> + bcm2835_pull_config_set(pc, pin, BCM2835_PUD_UP);
> + break;
> +
> + default:
> + return -EINVAL;
> +
> + } /* switch param type */
> } /* for each config */
>
> return 0;
> --
> 2.7.4
>
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