[PATCHv3][ 3/5] video: mx3fb: Add device tree suport.
Grant Likely
grant.likely at secretlab.ca
Fri Oct 25 15:50:40 EDT 2013
On Wed, 23 Oct 2013 14:43:47 +0200, Denis Carikli <denis at eukrea.com> wrote:
> Cc: Jean-Christophe Plagniol-Villard <plagnioj at jcrosoft.com>
> Cc: Tomi Valkeinen <tomi.valkeinen at ti.com>
> Cc: linux-fbdev at vger.kernel.org
> Cc: Rob Herring <rob.herring at calxeda.com>
> Cc: Pawel Moll <pawel.moll at arm.com>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Stephen Warren <swarren at wwwdotorg.org>
> Cc: Ian Campbell <ijc+devicetree at hellion.org.uk>
> Cc: devicetree at vger.kernel.org
> Cc: Sascha Hauer <kernel at pengutronix.de>
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: Eric Bénard <eric at eukrea.com>
> Signed-off-by: Denis Carikli <denis at eukrea.com>
> ---
> ChangeLog v2->v3:
> - The device tree bindings were reworked in order to make it look more like the
> IPUv3 bindings.
> - The interface_pix_fmt property now looks like the IPUv3 one.
> ---
> .../devicetree/bindings/video/fsl,mx3-fb.txt | 35 ++++++
> drivers/video/Kconfig | 2 +
> drivers/video/mx3fb.c | 125 +++++++++++++++++---
> 3 files changed, 147 insertions(+), 15 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/video/fsl,mx3-fb.txt
>
> diff --git a/Documentation/devicetree/bindings/video/fsl,mx3-fb.txt b/Documentation/devicetree/bindings/video/fsl,mx3-fb.txt
> new file mode 100644
> index 0000000..0b31374
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/video/fsl,mx3-fb.txt
> @@ -0,0 +1,35 @@
> +Freescale MX3 fb
> +================
> +
> +Required properties:
> +- compatible: Should be "fsl,mx3fb". compatible chips include the imx31 and the
> + imx35.
> +- reg: should be register base and length as documented in the datasheet.
> +- clocks: Handle to the ipu_gate clock.
> +
> +Example:
> +
> +lcdc: mx3fb at 53fc00b4 {
> + compatible = "fsl,mx3-fb";
> + reg = <0x53fc00b4 0x0b>;
> + clocks = <&clks 55>;
> +};
This (and some of the other bindings) are trivial, and they are all
associated with a single SoC. I think it would be better to collect all
the mx3 bindings into a single file rather than distributing them all
over the bindings tree.
I started thinking about this after some of the DT conversations in
Edinburgh this week. Unless there is a high likelyhood of components
being used separately, I think it is far more useful to collect all the
bindings for an SoC into a single file. It will certainly reduce a lot
of the boilerplate that we've been collecting in bindings documentation
files.
A long time ago I took that approach for the mpc5200 documentation[1].
Take a look at that organization and let me know what you think.
[1] Documentation/devicetree/bindings/powerpc/fsl/mpc5200.txt
g.
> +
> +Display support
> +===============
> +Required properties:
> +- model : The user-visible name of the display.
> +
> +Optional properties:
> +- interface_pix_fmt: How this display is connected to the
> + crtc. Currently supported types: "rgb24", "rgb565", "rgb666"
> +
> +It can also have an optional timing subnode as described in
> + Documentation/devicetree/bindings/video/display-timing.txt.
> +
> +Example:
> +
> +display at di0 {
> + interface-pix-fmt = "rgb666";
> + model = "CMO-QVGA";
> +};
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 14317b7..2a638df 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -2359,6 +2359,8 @@ config FB_MX3
> select FB_CFB_FILLRECT
> select FB_CFB_COPYAREA
> select FB_CFB_IMAGEBLIT
> + select VIDEOMODE_HELPERS
> + select FB_MODE_HELPERS
> default y
> help
> This is a framebuffer device for the i.MX31 LCD Controller. So
> diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
> index 804f874..de5a6c8 100644
> --- a/drivers/video/mx3fb.c
> +++ b/drivers/video/mx3fb.c
> @@ -31,6 +31,8 @@
> #include <linux/platform_data/dma-imx.h>
> #include <linux/platform_data/video-mx3fb.h>
>
> +#include <video/of_display_timing.h>
> +
> #include <asm/io.h>
> #include <asm/uaccess.h>
>
> @@ -757,11 +759,13 @@ static int __set_par(struct fb_info *fbi, bool lock)
> sig_cfg.Hsync_pol = true;
> if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
> sig_cfg.Vsync_pol = true;
> - if (fbi->var.sync & FB_SYNC_CLK_INVERT)
> + if ((fbi->var.sync & FB_SYNC_CLK_INVERT) ||
> + (fbi->var.sync & FB_SYNC_PIXDAT_HIGH_ACT))
> sig_cfg.clk_pol = true;
> if (fbi->var.sync & FB_SYNC_DATA_INVERT)
> sig_cfg.data_pol = true;
> - if (fbi->var.sync & FB_SYNC_OE_ACT_HIGH)
> + if ((fbi->var.sync & FB_SYNC_OE_ACT_HIGH) ||
> + (fbi->var.sync & FB_SYNC_DE_HIGH_ACT))
> sig_cfg.enable_pol = true;
> if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
> sig_cfg.clkidle_en = true;
> @@ -1351,21 +1355,75 @@ static struct fb_info *mx3fb_init_fbinfo(struct device *dev, struct fb_ops *ops)
> return fbi;
> }
>
> +static int match_dt_disp_data(const char *property)
> +{
> + if (!strcmp("rgb666", property))
> + return IPU_DISP_DATA_MAPPING_RGB666;
> + else if (!strcmp("rgb565", property))
> + return IPU_DISP_DATA_MAPPING_RGB565;
> + else if (!strcmp("rgb24", property))
> + return IPU_DISP_DATA_MAPPING_RGB888;
> + else
> + return -EINVAL;
> +}
> +
> static int init_fb_chan(struct mx3fb_data *mx3fb, struct idmac_channel *ichan)
> {
> struct device *dev = mx3fb->dev;
> struct mx3fb_platform_data *mx3fb_pdata = dev_get_platdata(dev);
> - const char *name = mx3fb_pdata->name;
> + struct device_node *np = dev->of_node;
> + const char *name;
> + const char *ipu_disp_format;
> unsigned int irq;
> struct fb_info *fbi;
> struct mx3fb_info *mx3fbi;
> const struct fb_videomode *mode;
> int ret, num_modes;
> + struct fb_videomode of_mode;
> + struct device_node *display_np, *root_np;
> +
> + if (np) {
> + root_np = of_find_node_by_path("/");
> + if (!root_np) {
> + dev_err(dev, "Can't get the \"/\" node.\n");
> + return -EINVAL;
> + }
> +
> + display_np = of_find_node_by_name(root_np, "display");
> + if (!display_np) {
> + dev_err(dev, "Can't get the display device node.\n");
> + return -EINVAL;
> + }
Finding a node by name is bad practice. Is is possible to find the node
via compatible?
> +
> + of_property_read_string(display_np, "interface-pix-fmt",
> + &ipu_disp_format);
> + if (!ipu_disp_format) {
> + mx3fb->disp_data_fmt = IPU_DISP_DATA_MAPPING_RGB666;
> + dev_warn(dev,
> + "ipu display data mapping was not defined, using the default rgb666.\n");
> + } else {
> + mx3fb->disp_data_fmt =
> + match_dt_disp_data(ipu_disp_format);
> + }
> +
> + if (mx3fb->disp_data_fmt == -EINVAL) {
> + dev_err(dev, "Illegal display data format \"%s\"\n",
> + ipu_disp_format);
> + return -EINVAL;
> + }
>
> - if (mx3fb_pdata->disp_data_fmt >= ARRAY_SIZE(di_mappings)) {
> - dev_err(dev, "Illegal display data format %d\n",
> + of_property_read_string(display_np, "model", &name);
> + if (ret) {
> + dev_err(dev, "Missing display model name\n");
> + return -EINVAL;
> + }
> + } else {
> + name = mx3fb_pdata->name;
> + if (mx3fb_pdata->disp_data_fmt >= ARRAY_SIZE(di_mappings)) {
> + dev_err(dev, "Illegal display data format %d\n",
> mx3fb_pdata->disp_data_fmt);
> - return -EINVAL;
> + return -EINVAL;
> + }
> }
>
> ichan->client = mx3fb;
> @@ -1386,12 +1444,24 @@ static int init_fb_chan(struct mx3fb_data *mx3fb, struct idmac_channel *ichan)
> goto emode;
> }
>
> - if (mx3fb_pdata->mode && mx3fb_pdata->num_modes) {
> - mode = mx3fb_pdata->mode;
> - num_modes = mx3fb_pdata->num_modes;
> + if (np) {
> + ret = of_get_fb_videomode(display_np, &of_mode,
> + OF_USE_NATIVE_MODE);
> + if (!ret) {
> + mode = &of_mode;
> + num_modes = 1;
> + } else {
> + mode = mx3fb_modedb;
> + num_modes = ARRAY_SIZE(mx3fb_modedb);
> + }
> } else {
> - mode = mx3fb_modedb;
> - num_modes = ARRAY_SIZE(mx3fb_modedb);
> + if (mx3fb_pdata->mode || !mx3fb_pdata->num_modes) {
> + mode = mx3fb_pdata->mode;
> + num_modes = mx3fb_pdata->num_modes;
> + } else {
> + mode = mx3fb_modedb;
> + num_modes = ARRAY_SIZE(mx3fb_modedb);
> + }
> }
>
> if (!fb_find_mode(&fbi->var, fbi, fb_mode, mode,
> @@ -1421,7 +1491,8 @@ static int init_fb_chan(struct mx3fb_data *mx3fb, struct idmac_channel *ichan)
> mx3fbi->mx3fb = mx3fb;
> mx3fbi->blank = FB_BLANK_NORMAL;
>
> - mx3fb->disp_data_fmt = mx3fb_pdata->disp_data_fmt;
> + if (!np)
> + mx3fb->disp_data_fmt = mx3fb_pdata->disp_data_fmt;
>
> init_completion(&mx3fbi->flip_cmpl);
> disable_irq(ichan->eof_irq);
> @@ -1449,13 +1520,26 @@ emode:
> return ret;
> }
>
> +static int imx_dma_is_dt_ipu(struct dma_chan *chan)
> +{
> + /* Example: 53fc0000.ipu */
> + if (chan && chan->device && chan->device->dev) {
> + char *name = dev_name(chan->device->dev);
> + name = strchr(name, '.');
> + if (name)
> + return !strcmp(name, ".ipu");
> + }
> +
> + return 0;
> +}
> +
> static bool chan_filter(struct dma_chan *chan, void *arg)
> {
> struct dma_chan_request *rq = arg;
> struct device *dev;
> struct mx3fb_platform_data *mx3fb_pdata;
>
> - if (!imx_dma_is_ipu(chan))
> + if (!imx_dma_is_ipu(chan) && !imx_dma_is_dt_ipu(chan))
> return false;
>
> if (!rq)
> @@ -1464,8 +1548,12 @@ static bool chan_filter(struct dma_chan *chan, void *arg)
> dev = rq->mx3fb->dev;
> mx3fb_pdata = dev_get_platdata(dev);
>
> - return rq->id == chan->chan_id &&
> - mx3fb_pdata->dma_dev == chan->device->dev;
> + /* When using the devicetree, mx3fb_pdata is NULL */
> + if (imx_dma_is_dt_ipu(chan))
> + return rq->id == chan->chan_id;
> + else
> + return rq->id == chan->chan_id &&
> + mx3fb_pdata->dma_dev == chan->device->dev;
> }
>
> static void release_fbi(struct fb_info *fbi)
> @@ -1565,9 +1653,16 @@ static int mx3fb_remove(struct platform_device *dev)
> return 0;
> }
>
> +static struct of_device_id mx3fb_of_dev_id[] = {
> + { .compatible = "fsl,mx3-fb", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, mx3fb_of_dev_id);
> +
> static struct platform_driver mx3fb_driver = {
> .driver = {
> .name = MX3FB_NAME,
> + .of_match_table = mx3fb_of_dev_id,
> .owner = THIS_MODULE,
> },
> .probe = mx3fb_probe,
> --
> 1.7.9.5
>
>
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