linux-kernel - Re: [PATCH 4/4] ARM: mxs: cfa10036: Fixup OLED display reset polarity

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Date:   Wed, 19 Dec 2018 11:29:49 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vokáč Michal <Michal.Vokac@...ft.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/4] ARM: mxs: cfa10036: Fixup OLED display reset polarity

On Tue, Dec 04, 2018 at 03:03:40PM +0000, Vokáč Michal wrote:
> There was a bug in reset signal generation in ssd1307fb OLED driver.
> The display needs an active-low reset signal but the driver produced
> the correct sequence only if the GPIO used for reset was specified as
> GPIO_ACTIVE_HIGH.
> 
> Now as the OLED driver is fixed it is also necessarry to implement
> a fixup for all current users of the old DT ABI. There is only one
> in-tree user and that is the Crystalfontz CFA-10036 board. In case
> this board is booting and GPIO_ACTIVE_HIGH is used for reset we
> override it to GPIO_ACTIVE_LOW.
> 
> Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
> ---
>  arch/arm/mach-mxs/mach-mxs.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
> index 1c6062d..23c260c 100644
> --- a/arch/arm/mach-mxs/mach-mxs.c
> +++ b/arch/arm/mach-mxs/mach-mxs.c
> @@ -21,6 +21,7 @@
>  #include <linux/reboot.h>
>  #include <linux/micrel_phy.h>
>  #include <linux/of_address.h>
> +#include <linux/of_gpio.h>
>  #include <linux/of_platform.h>
>  #include <linux/phy.h>
>  #include <linux/pinctrl/consumer.h>
> @@ -268,9 +269,53 @@ static void __init apx4devkit_init(void)
>  					   apx4devkit_phy_fixup);
>  }
>  
> +#define OLED_RESET_GPIO_LEN	3
> +#define OLED_RESET_GPIO_SIZE	(OLED_RESET_GPIO_LEN * sizeof(u32))
> +
> +static void __init crystalfontz_oled_reset_fixup(void)
> +{
> +	struct property *newgpio;
> +	struct device_node *np;
> +	u32 *gpiospec;
> +	int i, ret;
> +
> +	np = of_find_compatible_node(NULL, NULL, "solomon,ssd1306fb-i2c");
> +	if (!np)
> +		return;
> +
> +	newgpio = kzalloc(sizeof(*newgpio) + OLED_RESET_GPIO_SIZE, GFP_KERNEL);
> +	if (!newgpio)
> +		return;
> +
> +	newgpio->value = newgpio + 1;
> +	newgpio->length = OLED_RESET_GPIO_SIZE;
> +	newgpio->name = kstrdup("reset-gpios", GFP_KERNEL);
> +	if (!newgpio->name) {
> +		kfree(newgpio);
> +		return;
> +	}
> +
> +	gpiospec = newgpio->value;
> +	for (i = 0; i < OLED_RESET_GPIO_LEN; i++) {
> +		ret = of_property_read_u32_index(np, "reset-gpios", i,
> +						 &gpiospec[i]);

Don't we have a helper to read the whole array?

Otherwise, for the series:

Reviewed-by: Rob Herring <robh@...nel.org>

> +		if (ret) {
> +			kfree(newgpio);
> +			return;
> +		}
> +	}
> +
> +	if (!(gpiospec[2] & OF_GPIO_ACTIVE_LOW)) {
> +		gpiospec[2] |= OF_GPIO_ACTIVE_LOW;
> +		cpu_to_be32_array(gpiospec, gpiospec, OLED_RESET_GPIO_LEN);
> +		of_update_property(np, newgpio);
> +	}
> +}
> +
>  static void __init crystalfontz_init(void)
>  {
>  	update_fec_mac_prop(OUI_CRYSTALFONTZ);
> +	crystalfontz_oled_reset_fixup();
>  }
>  
>  static void __init duckbill_init(void)
> -- 
> 2.1.4
>