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SubjectRe: [PATCH v3 2/3] drm: bridge: Add thc63lvd1024 LVDS decoder driver
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On 03/13/2018 05:30 PM, Jacopo Mondi wrote:

> Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel
> output decoder.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
[...]
> diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c b/drivers/gpu/drm/bridge/thc63lvd1024.c
> new file mode 100644
> index 0000000..4b059c0
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
> @@ -0,0 +1,241 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * THC63LVD1024 LVDS to parallel data DRM bridge driver.
> + *
> + * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@jmondi.org>
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_panel.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +static const char * const thc63_reg_names[] = {
> + "vcc", "lvcc", "pvcc", "cvcc", };

Your bracing style is pretty strange -- neither here nor there. Please place };
on the next line...

[...]
> +static void thc63_enable(struct drm_bridge *bridge)
> +{
> + struct thc63_dev *thc63 = to_thc63(bridge);
> + struct regulator *vcc;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
> + vcc = thc63->vccs[i];
> + if (vcc) {
> + ret = regulator_enable(vcc);
> + if (ret)

You hardly need this variable, could do a call right in this *if*.

[...]
> +error_vcc_enable:
> + dev_err(thc63->dev, "Failed to enable regulator %u\n", i);
> +}
> +

Why not do this instead of *goto* before?

> +static void thc63_disable(struct drm_bridge *bridge)
> +{
> + struct thc63_dev *thc63 = to_thc63(bridge);
> + struct regulator *vcc;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
> + vcc = thc63->vccs[i];
> + if (vcc) {
> + ret = regulator_disable(vcc);
> + if (ret)

Again, no need for 'ret' whatsoever...

> + goto error_vcc_disable;
> + }
> + }
> +
> + if (thc63->pwdn)
> + gpiod_set_value(thc63->pwdn, 1);
> +
> + if (thc63->oe)
> + gpiod_set_value(thc63->oe, 0);
> +
> + return;
> +
> +error_vcc_disable:
> + dev_err(thc63->dev, "Failed to disable regulator %u\n", i);

Again, why not do it instead of *goto*?

[...]
> +static int thc63_gpio_init(struct thc63_dev *thc63)
> +{
> + thc63->pwdn = devm_gpiod_get_optional(thc63->dev, "pwdn",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(thc63->pwdn)) {
> + dev_err(thc63->dev, "Unable to get GPIO \"pwdn\"\n");

"pwdn-gpios" maybe?

> + return PTR_ERR(thc63->pwdn);
> + }
> +
> + thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
> + if (IS_ERR(thc63->oe)) {
> + dev_err(thc63->dev, "Unable to get GPIO \"oe\"\n");

"oe-gpios" maybe?

[...]

MBR, Sergei

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