From: Thierry Reding <treding@nvidia.com>
To: Archit Taneja <architt@codeaurora.org>
Cc: <dri-devel@lists.freedesktop.org>, <a.hajda@samsung.com>,
<jani.nikula@linux.intel.com>, <linux-kernel@vger.kernel.org>,
<airlied@linux.ie>, <daniel@ffwll.ch>, <l.stach@pengutronix.de>,
<robh@kernel.org>, <linux-arm-msm@vger.kernel.org>
Subject: Re: [PATCH v4 3/6] drm/dsi: Try to match non-DT dsi devices
Date: Thu, 21 Jan 2016 17:05:15 +0100 [thread overview]
Message-ID: <20160121160514.GC647@ulmo.nvidia.com> (raw)
In-Reply-To: <1449751300-2841-4-git-send-email-architt@codeaurora.org>
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On Thu, Dec 10, 2015 at 06:11:37PM +0530, Archit Taneja wrote:
> Add a device name field in mipi_dsi_device. This name is different from
> the actual dev name (which is of the format "hostname.reg"). When the
> device is created via DT, this name is set to the modalias string.
Why? What's the use of setting this to the modalias string?
> In the non-DT case, the driver creating the DSI device provides the
> name by populating a filed in mipi_dsi_device_info.
>
> Matching for DT case would be as it was before. For the non-DT case,
> we compare the device and driver names. Other buses (like i2c/spi)
"I2C" and "SPI", please.
> perform a non-DT match by comparing the device name and entries in the
> driver's id_table. Such a mechanism isn't used for the dsi bus.
"DSI", please.
>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> ---
> drivers/gpu/drm/drm_mipi_dsi.c | 25 ++++++++++++++++++++++++-
> include/drm/drm_mipi_dsi.h | 6 ++++++
> 2 files changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index 9434585..5a46802 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -45,9 +45,26 @@
> * subset of the MIPI DCS command set.
> */
>
> +static const struct device_type mipi_dsi_device_type;
> +
> static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
> {
> - return of_driver_match_device(dev, drv);
> + struct mipi_dsi_device *dsi;
> +
> + if (dev->type == &mipi_dsi_device_type)
> + dsi = to_mipi_dsi_device(dev);
> + else
> + return 0;
I think this check is redundant. I'm not aware of any case where the bus
->match() callback is called on a device that isn't on said bus.
> + /* attempt OF style match */
> + if (of_driver_match_device(dev, drv))
> + return 1;
> +
> + /* compare dsi device and driver names */
"DSI", please.
> + if (!strcmp(dsi->name, drv->name))
> + return 1;
> +
> + return 0;
> }
>
> static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
> @@ -125,6 +142,7 @@ struct mipi_dsi_device *mipi_dsi_device_new(struct mipi_dsi_host *host,
> dsi->dev.type = &mipi_dsi_device_type;
> dsi->dev.of_node = info->node;
> dsi->channel = info->reg;
> + strlcpy(dsi->name, info->type, sizeof(dsi->name));
Don't you need to check info->type != NULL before doing this?
>
> dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), info->reg);
>
> @@ -148,6 +166,11 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
> int ret;
> u32 reg;
>
> + if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
> + dev_err(dev, "modalias failure on %s\n", node->full_name);
> + return ERR_PTR(-EINVAL);
> + }
> +
> ret = of_property_read_u32(node, "reg", ®);
> if (ret) {
> dev_err(dev, "device node %s has no valid reg property: %d\n",
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 90f4f3c..cb084af 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -139,8 +139,11 @@ enum mipi_dsi_pixel_format {
> MIPI_DSI_FMT_RGB565,
> };
>
> +#define DSI_DEV_NAME_SIZE 20
> +
> /**
> * struct mipi_dsi_device_info - template for creating a mipi_dsi_device
> + * @type: dsi peripheral chip type
> * @reg: DSI virtual channel assigned to peripheral
> * @node: pointer to OF device node
> *
> @@ -148,6 +151,7 @@ enum mipi_dsi_pixel_format {
> * DSI device
> */
> struct mipi_dsi_device_info {
> + char type[DSI_DEV_NAME_SIZE];
Why limit ourselves to 20 characters? And why even so complicated? Isn't
the type always static when someone specifies this? Couldn't we simply
use a const char *name here instead?
Thierry
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next prev parent reply other threads:[~2016-01-21 16:05 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-30 5:24 [RFC 0/2] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-06-30 5:24 ` [RFC 1/2] drm/dsi: Create dummy DSI devices Archit Taneja
2015-08-19 8:10 ` Andrzej Hajda
2015-08-19 9:30 ` Archit Taneja
2015-06-30 5:24 ` [RFC 2/2] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-08-19 8:46 ` Andrzej Hajda
2015-08-19 5:07 ` [RFC 0/2] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-08-19 13:13 ` Thierry Reding
2015-08-19 14:17 ` Lucas Stach
2015-08-19 14:34 ` Thierry Reding
2015-08-19 14:52 ` Lucas Stach
2015-08-19 15:02 ` Thierry Reding
2015-08-19 15:39 ` Jani Nikula
2015-08-20 4:16 ` Archit Taneja
2015-08-20 11:48 ` Thierry Reding
2015-08-21 6:09 ` Archit Taneja
2015-09-07 11:46 ` Archit Taneja
2015-09-08 10:27 ` Andrzej Hajda
2015-09-10 6:15 ` Archit Taneja
2015-09-10 7:32 ` Thierry Reding
2015-09-15 10:32 ` Archit Taneja
2015-09-15 15:43 ` Rob Herring
2015-09-17 8:56 ` Archit Taneja
2015-09-15 10:41 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 0/5] " Archit Taneja
2015-10-06 9:24 ` [RFC v2 1/5] drm/dsi: Refactor device creation Archit Taneja
2015-10-30 11:28 ` Andrzej Hajda
2015-10-06 9:24 ` [RFC v2 2/5] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2015-10-30 12:42 ` Andrzej Hajda
2015-11-02 5:26 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 3/5] drm/dsi: Check for used channels Archit Taneja
2015-10-30 12:52 ` Andrzej Hajda
2015-11-02 5:28 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 4/5] drm/dsi: Add routine to unregister dsi device Archit Taneja
2015-10-30 14:21 ` Andrzej Hajda
2015-11-02 6:28 ` Archit Taneja
2015-11-02 10:42 ` Andrzej Hajda
2015-11-03 7:18 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-10-06 10:00 ` kbuild test robot
2015-11-02 10:50 ` Andrzej Hajda
2015-11-03 7:20 ` Archit Taneja
2015-11-30 12:01 ` [PATCH v3 0/5] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-11-30 12:01 ` [PATCH v3 1/5] drm/dsi: Refactor device creation Archit Taneja
2015-11-30 12:01 ` [PATCH v3 2/5] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2015-11-30 12:45 ` kbuild test robot
2015-12-07 5:29 ` Archit Taneja
2015-12-07 8:45 ` Jani Nikula
2015-12-07 8:59 ` Archit Taneja
2015-12-07 9:10 ` Jani Nikula
2015-12-07 9:18 ` Archit Taneja
2015-12-07 10:07 ` Jani Nikula
2015-12-07 16:55 ` Rob Clark
2015-11-30 12:01 ` [PATCH v3 3/5] drm/dsi: Check for used channels Archit Taneja
2015-11-30 12:01 ` [PATCH v3 4/5] drm/dsi: Add routine to unregister dsi device Archit Taneja
2015-11-30 12:34 ` Andrzej Hajda
2015-11-30 12:01 ` [PATCH v3 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-12-10 12:41 ` [PATCH v4 0/6] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-12-10 12:41 ` [PATCH v4 1/6] drm/dsi: check for CONFIG_OF when defining of_mipi_dsi_device_add Archit Taneja
2016-01-21 15:31 ` Thierry Reding
2016-01-26 14:59 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 2/6] drm/dsi: Refactor device creation Archit Taneja
2016-01-21 15:46 ` Thierry Reding
2016-01-26 17:05 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 3/6] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2016-01-21 16:05 ` Thierry Reding [this message]
2016-01-26 18:04 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 4/6] drm/dsi: Check for used channels Archit Taneja
2016-01-21 16:11 ` Thierry Reding
2016-01-27 5:16 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 5/6] drm/dsi: Add routine to unregister dsi device Archit Taneja
2016-01-21 16:12 ` Thierry Reding
2016-01-27 5:20 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 6/6] drm/dsi: Get DSI host by DT device node Archit Taneja
2016-01-21 16:16 ` Thierry Reding
2016-01-27 5:21 ` Archit Taneja
2016-01-05 5:29 ` [PATCH v4 0/6] drm/dsi: DSI for devices with different control bus Archit Taneja
2016-02-12 9:18 ` [PATCH v5 0/5] " Archit Taneja
2016-02-12 9:18 ` [PATCH v5 1/5] drm/dsi: check for CONFIG_OF when defining of_mipi_dsi_device_add Archit Taneja
2016-02-12 9:18 ` [PATCH v5 2/5] drm/dsi: Use mipi_dsi_device_register_full for DSI device creation Archit Taneja
2016-02-12 9:18 ` [PATCH v5 3/5] drm/dsi: Try to match non-DT DSI devices Archit Taneja
2016-02-12 9:18 ` [PATCH v5 4/5] drm/dsi: Add routine to unregister a DSI device Archit Taneja
2016-02-12 9:18 ` [PATCH v5 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2016-03-02 16:05 ` [PATCH v5 0/5] drm/dsi: DSI for devices with different control bus Thierry Reding
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