Hi Rob,
On Tuesday, 20 February 2018 02:54:00 EET Rob Herring wrote:
> On Wed, Feb 14, 2018 at 6:04 PM, 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
> > <[email protected]>
> > ---
> > 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
>
> Generally looks fine to me. A few things below.
>
> > 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 | 374
> > +++++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_of.h
> > | 20 ++
> > .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts | 81 +++++
> > .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts | 55 +++
> > .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts | 55 +++
> > .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts | 55 +++
> > .../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts | 55 +++
> > 9 files changed, 703 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..141f6eda6e98
> > --- /dev/null
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_of.c
[snip]
> > +static struct device_node __init *
> > +rcar_du_of_find_node_by_path(struct device_node *parent, const char
> > *path)
> > +{
>
> I guess I never followed up on the last version. I think a wrapper
> around __of_find_node_by_path would work for you here. It can start at
> any level. Though maybe it is not needed. See below.
You're right, I won't need this function anymore, so I'll drop it. I think
looking up a node by path starting at a given parent would still be useful,
but there's no need to add a function without a user.
> > + parent = of_node_get(parent);
> > + if (!parent)
> > + return NULL;
> > +
> > + while (parent && *path == '/') {
> > + struct device_node *child = NULL;
> > + struct device_node *node;
> > + const char *next;
> > + size_t len;
> > +
> > + /* Skip the initial '/' delimiter and find the next one.
> > */
> > + path++;
> > + next = strchrnul(path, '/');
> > + len = next - path;
> > + if (!len)
> > + goto error;
> > +
> > + for_each_child_of_node(parent, node) {
> > + const char *name = kbasename(node->full_name);
> > +
> > + if (strncmp(path, name, len) == 0 &&
> > + strlen(name) == len) {
> > + child = node;
> > + break;
> > + }
> > + }
> > +
> > + if (!child)
> > + goto error;
> > +
> > + of_node_put(parent);
> > + parent = child;
> > + path = next;
> > + }
> > +
> > + return parent;
> > +
> > +error:
> > + of_node_put(parent);
> > + return NULL;
> > +}
> > +
> > +static int __init rcar_du_of_add_property(struct device_node *np,
> > + const char *name, const void
> > *value,
> > + size_t length)
>
> So, were you going to revive Pantelis' patch or move this to the core?
Do you have a pointer to that patch ?
> > +{
> > + struct property *prop;
> > +
> > + prop = kzalloc(sizeof(*prop), GFP_KERNEL);
> > + if (!prop)
> > + return -ENOMEM;
> > +
> > + prop->name = kstrdup(name, GFP_KERNEL);
> > + prop->value = kmemdup(value, length, GFP_KERNEL);
> > + prop->length = length;
> > +
> > + if (!prop->name || !prop->value) {
> > + kfree(prop->name);
> > + kfree(prop->value);
> > + kfree(prop);
> > + return -ENOMEM;
> > + }
> > +
> > + of_property_set_flag(prop, OF_DYNAMIC);
> > +
> > + prop->next = np->properties;
> > + np->properties = prop;
> > +
> > + return 0;
> > +}
[snip]
> > +static void __init rcar_du_of_lvds_patch_one(struct device_node *lvds,
> > + const struct of_phandle_args
> > *clk,
> > + struct device_node *local,
> > + struct device_node *remote)
> > +{
> > + struct device_node *endpoints[2];
> > + unsigned int psize;
> > + unsigned int i;
> > + __be32 value[4];
> > + int ret;
> > +
> > + /*
> > + * Set the LVDS clocks property. This can't be performed by the
> > overlay
> > + * as the structure of the clock specifier has changed over time,
> > and we
> > + * don't know at compile time which binding version the system we
> > will
> > + * run on uses.
> > + */
> > + if (clk->args_count >= ARRAY_SIZE(value) - 1)
> > + return;
> > +
> > + value[0] = cpu_to_be32(clk->np->phandle);
> > + for (i = 0; i < clk->args_count; ++i)
> > + value[i + 1] = cpu_to_be32(clk->args[i]);
> > +
> > + psize = (clk->args_count + 1) * 4;
> > + ret = rcar_du_of_add_property(lvds, "clocks", value, psize);
> > + if (ret < 0)
> > + return;
> > +
> > + /*
> > + * Insert the node in the OF graph: patch the LVDS ports
> > remote-endpoint
> > + * properties to point to the endpoints of the sibling nodes in
> > the
> > + * graph. This can't be performed by the overlay: on the input
> > side the
> > + * overlay would contain a phandle for the DU LVDS output port
> > that
> > + * would clash with the system DT, and on the output side the
> > connection
> > + * is board-specific.
> > + */
> > + endpoints[0] = rcar_du_of_find_node_by_path(lvds,
> > +
> > "/ports/port@0/endpoint");
>
> of_graph_get_endpoint_by_regs() should work here instead or am I
> missing something?
Good point. The patch series started with a need for a node lookup by path
function to patch the overlay before applying it, and I failed to see that the
function wasn't needed anymore in this new version. I've successfully tested
of_graph_get_endpoint_by_regs(), I'll use that in v4.
> > + endpoints[1] = rcar_du_of_find_node_by_path(lvds,
> > +
> > "/ports/port@1/endpoint"); + if (!endpoints[0] || !endpoints[1])
> > + return;
> > +
> > + value[0] = cpu_to_be32(local->phandle);
> > + ret = rcar_du_of_add_property(endpoints[0], "remote-endpoint",
> > + value, 4);
>
> s/4/sizeof(__be32)/
Will fix in v4.
> > + if (ret < 0)
> > + goto done;
> > +
> > + value[0] = cpu_to_be32(remote->phandle);
> > + ret = rcar_du_of_add_property(endpoints[1], "remote-endpoint",
> > + value, 4);
> > + if (ret < 0)
> > + goto done;
> > +
> > +done:
> > + of_node_put(endpoints[0]);
> > + of_node_put(endpoints[1]);
> > +}
[snip]
--
Regards,
Laurent Pinchart
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