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SubjectRe: [PATCH v6 2/3] drm: bridge: Add thc63lvd1024 LVDS decoder driver
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Hi Jacopo,

On 03/16/2018 05:16 PM, Jacopo Mondi wrote:
> Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel
> output converter.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
> drivers/gpu/drm/bridge/Kconfig | 6 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/thc63lvd1024.c | 255 ++++++++++++++++++++++++++++++++++
> 3 files changed, 262 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/thc63lvd1024.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3b99d5a..5815a20 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -92,6 +92,12 @@ config DRM_SII9234
> It is an I2C driver, that detects connection of MHL bridge
> and starts encapsulation of HDMI signal.
>
> +config DRM_THINE_THC63LVD1024
> + tristate "Thine THC63LVD1024 LVDS decoder bridge"
> + depends on OF
> + ---help---
> + Thine THC63LVD1024 LVDS/parallel converter driver.
> +
> config DRM_TOSHIBA_TC358767
> tristate "Toshiba TC358767 eDP bridge"
> depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 373eb28..fd90b16 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
> obj-$(CONFIG_DRM_SII902X) += sii902x.o
> obj-$(CONFIG_DRM_SII9234) += sii9234.o
> +obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
> obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c b/drivers/gpu/drm/bridge/thc63lvd1024.c
> new file mode 100644
> index 0000000..02a54c2
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
> @@ -0,0 +1,255 @@
> +// 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>
> +
> +enum {
> + THC63_LVDS_IN0,
> + THC63_LVDS_IN1,
> + THC63_DIGITAL_OUT0,
> + THC63_DIGITAL_OUT1,
> +};
> +
> +static const char * const thc63_reg_names[] = {
> + "vcc", "lvcc", "pvcc", "cvcc",
> +};
> +
> +struct thc63_dev {
> + struct device *dev;
> +
> + struct regulator *vccs[ARRAY_SIZE(thc63_reg_names)];
> +
> + struct gpio_desc *pdwn;
> + struct gpio_desc *oe;
> +
> + struct drm_bridge bridge;
> + struct drm_bridge *next;
> +};
> +
> +static inline struct thc63_dev *to_thc63(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct thc63_dev, bridge);
> +}
> +
> +static int thc63_attach(struct drm_bridge *bridge)
> +{
> + struct thc63_dev *thc63 = to_thc63(bridge);
> +
> + return drm_bridge_attach(bridge->encoder, thc63->next, bridge);
> +}
> +
> +static void thc63_enable(struct drm_bridge *bridge)
> +{
> + struct thc63_dev *thc63 = to_thc63(bridge);
> + struct regulator *vcc;
> + int i;

unsigned int i;

> +
> + for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
> + vcc = thc63->vccs[i];
> + if (!vcc)
> + continue;
> +
> + if (regulator_enable(vcc))
> + goto error_vcc_enable;
> + }
> +
> + if (thc63->pdwn)
> + gpiod_set_value(thc63->pdwn, 0);
> +
> + if (thc63->oe)
> + gpiod_set_value(thc63->oe, 1);
> +
> + return;
> +
> +error_vcc_enable:
> + dev_err(thc63->dev, "Failed to enable regulator %s\n",
> + thc63_reg_names[i]);
> +
> + for (i = i - 1; i >= 0; i--) {
> + vcc = thc63->vccs[i];
> + if (!vcc)
> + continue;
> +
> + regulator_disable(vcc);
> + }
> +}
> +
> +static void thc63_disable(struct drm_bridge *bridge)
> +{
> + struct thc63_dev *thc63 = to_thc63(bridge);
> + struct regulator *vcc;
> + int i;
> +
> + if (thc63->oe)
> + gpiod_set_value(thc63->oe, 0);
> +
> + if (thc63->pdwn)
> + gpiod_set_value(thc63->pdwn, 1);
> +
> + for (i = ARRAY_SIZE(thc63->vccs) - 1; i >= 0; i--) {
> + vcc = thc63->vccs[i];
> + if (!vcc)
> + continue;
> +
> + if (regulator_disable(vcc))
> + dev_dbg(thc63->dev,
> + "Failed to disable regulator %s\n",
> + thc63_reg_names[i]);
> + }
> +}
> +
> +struct drm_bridge_funcs thc63_bridge_func = {

Apparently you missed all my comments from v2 review.

If you like to avoid non-NULL function pointers to the void, please
use static const storage qualifier.

--
With best wishes,
Vladimir

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