On 03/01/18 14:05, Laurent Pinchart wrote:
> The internal LVDS encoders now have their own DT bindings. Before
> switching the driver infrastructure to those new bindings, implement
> backward-compatibility through live DT patching.
>
> Patching is disabled and will be enabled along with support for the new
> DT bindings in the DU driver.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> ---
> Changes since v6:
>
> - Use of_overlay_fdt_apply()
>
> Changes since v5:
>
> - Use a private copy of rcar_du_of_changeset_add_property()
>
> Changes since v3:
>
> - Use the OF changeset API
> - Use of_graph_get_endpoint_by_regs()
> - Replace hardcoded constants by sizeof()
>
> Changes since v2:
>
> - Update the SPDX headers to use C-style comments in header files
> - Removed the manually created __local_fixups__ node
> - Perform manual fixups on live DT instead of overlay
>
> Changes since v1:
>
> - Select OF_FLATTREE
> - Compile LVDS DT bindings patch code when DRM_RCAR_LVDS is selected
> - Update the SPDX headers to use GPL-2.0 instead of GPL-2.0-only
> - Turn __dtb_rcar_du_of_lvds_(begin|end) from u8 to char
> - Pass void begin and end pointers to rcar_du_of_get_overlay()
> - Use of_get_parent() instead of accessing the parent pointer directly
> - Find the LVDS endpoints nodes based on the LVDS node instead of the
> root of the overlay
> - Update to the <soc>-lvds compatible string format
> ---
> drivers/gpu/drm/rcar-du/Kconfig | 2 +
> drivers/gpu/drm/rcar-du/Makefile | 7 +-
> drivers/gpu/drm/rcar-du/rcar_du_of.c | 321 +++++++++++++++++++++
> drivers/gpu/drm/rcar-du/rcar_du_of.h | 20 ++
> .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts | 79 +++++
> .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts | 53 ++++
> .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts | 53 ++++
> .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts | 53 ++++
> .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts | 53 ++++
> 9 files changed, 640 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of.c
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of.h
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts
>
> diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
> index 5d0b4b7119af..3f83352a7313 100644
> --- a/drivers/gpu/drm/rcar-du/Kconfig
> +++ b/drivers/gpu/drm/rcar-du/Kconfig
> @@ -22,6 +22,8 @@ config DRM_RCAR_LVDS
> bool "R-Car DU LVDS Encoder Support"
> depends on DRM_RCAR_DU
> select DRM_PANEL
> + select OF_FLATTREE
> + select OF_OVERLAY
> help
> Enable support for the R-Car Display Unit embedded LVDS encoders.
>
> diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
> index 0cf5c11030e8..86b337b4be5d 100644
> --- a/drivers/gpu/drm/rcar-du/Makefile
> +++ b/drivers/gpu/drm/rcar-du/Makefile
> @@ -8,7 +8,12 @@ rcar-du-drm-y := rcar_du_crtc.o \
> rcar_du_plane.o
>
> rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_lvdsenc.o
> -
> +rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o \
> + rcar_du_of_lvds_r8a7790.dtb.o \
> + rcar_du_of_lvds_r8a7791.dtb.o \
> + rcar_du_of_lvds_r8a7793.dtb.o \
> + rcar_du_of_lvds_r8a7795.dtb.o \
> + rcar_du_of_lvds_r8a7796.dtb.o
> rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
>
> obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of.c b/drivers/gpu/drm/rcar-du/rcar_du_of.c
> new file mode 100644
> index 000000000000..4e3376c64dfd
> --- /dev/null
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_of.c
> @@ -0,0 +1,321 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * rcar_du_of.c - Legacy DT bindings compatibility
> + *
> + * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> + *
> + * Based on work from Jyri Sarha <jsarha@xxxxxx>
> + * Copyright (C) 2015 Texas Instruments
> + */
> +
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_fdt.h>
> +#include <linux/of_graph.h>
> +#include <linux/slab.h>
> +
> +#include "rcar_du_crtc.h"
> +#include "rcar_du_drv.h"
> +
> +/* -----------------------------------------------------------------------------
> + * Generic Overlay Handling
> + */
> +
> +struct rcar_du_of_overlay {
> + const char *compatible;
> + void *begin;
> + void *end;
> +};
> +
> +#define RCAR_DU_OF_DTB(type, soc) \
> + extern char __dtb_rcar_du_of_##type##_##soc##_begin[]; \
> + extern char __dtb_rcar_du_of_##type##_##soc##_end[]
> +
> +#define RCAR_DU_OF_OVERLAY(type, soc) \
> + { \
> + .compatible = "renesas,du-" #soc, \
> + .begin = __dtb_rcar_du_of_##type##_##soc##_begin, \
> + .end = __dtb_rcar_du_of_##type##_##soc##_end, \
> + }
> +
> +static int __init rcar_du_of_apply_overlay(const struct rcar_du_of_overlay *dtbs,
> + const char *compatible)
> +{
> + const struct rcar_du_of_overlay *dtb = NULL;
> + unsigned int i;
> + int ovcs_id;
> +
> + for (i = 0; dtbs[i].compatible; ++i) {
> + if (!strcmp(dtbs[i].compatible, compatible)) {
> + dtb = &dtbs[i];
> + break;
> + }
> + }
> +
> + if (!dtb)
> + return -ENODEV;
> +
> + ovcs_id = 0;
> + return of_overlay_fdt_apply(dtb->begin, &ovcs_id);
return of_overlay_fdt_apply(dtb->begin, dtb->end - dtb->begin, &ovcs_id);
For version 5 of my patch series I added an FDT size argument, as you
suggested.
Reviewed-by: Frank Rowand <frank.rowand@xxxxxxxx>
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