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Date: Wed, 29 Oct 2014 08:44:34 +0100
From: Alexander Sverdlin <alexander.sverdlin@....com>
To: ext Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
Pantelis Antoniou <panto@...oniou-consulting.com>
CC: Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <robherring2@...il.com>,
Stephen Warren <swarren@...dotorg.org>,
Matt Porter <matt.porter@...aro.org>,
Koen Kooi <koen@...inion.thruhere.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alison Chaiken <Alison_Chaiken@...tor.com>,
Dinh Nguyen <dinh.linux@...il.com>,
Jan Lubbe <jluebbe@...net.de>, Michael Stickel <ms@...able.de>,
Guenter Roeck <linux@...ck-us.net>,
Dirk Behme <dirk.behme@...il.com>,
Alan Tull <delicious.quinoa@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Michael Bohan <mbohan@...eaurora.org>,
Ionut Nicu <ioan.nicu.ext@....com>,
Michal Simek <monstr@...str.eu>,
Matt Ranostay <mranostay@...il.com>,
Joel Becker <jlbec@...lplan.org>, devicetree@...r.kernel.org,
Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org, Pete Popov <pete.popov@...sulko.com>,
Dan Malek <dan.malek@...sulko.com>,
Georgi Vlaev <georgi.vlaev@...sulko.com>,
"Wiebe, Wladislav (NSN - DE/Ulm)" <wladislav.wiebe@....com>
Subject: Re: [PATCH v8 7/8] of: spi: Export single device registration method
and accessors
Hello Pantelis,
I've pointed to this already, but anyway:
On 28/10/14 21:36, ext Pantelis Antoniou wrote:
> Dynamically inserting spi device nodes requires the use of a single
> device registration method. Rework and export it.
>
> Methods to lookup a device/master using a device node are added
> as well, of_find_spi_master_by_node() & of_find_spi_device_by_node().
>
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> ---
> drivers/spi/spi.c | 256 +++++++++++++++++++++++++++++++++---------------------
> 1 file changed, 158 insertions(+), 98 deletions(-)
>
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index ebcb33d..f81d799 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -1220,6 +1220,123 @@ err_init_queue:
> /*-------------------------------------------------------------------------*/
>
> #if defined(CONFIG_OF)
> +
> +static struct spi_device *
> +of_register_spi_device(struct spi_master *master, struct device_node *node)
During the test Wladislav has found that node is actually not used,
> +{
> + struct spi_device *spi;
> + struct device_node *nc;
but non-initialized nc is used further in the code.
Should not nc be a parameter of the function instead of a local variable?
> + int rc;
> + u32 value;
> +
> + /* Alloc an spi_device */
> + spi = spi_alloc_device(master);
> + if (!spi) {
> + dev_err(&master->dev, "spi_device alloc error for %s\n",
> + nc->full_name);
> + rc = -ENOMEM;
> + goto err_out;
> + }
> +
> + /* Select device driver */
> + rc = of_modalias_node(nc, spi->modalias,
> + sizeof(spi->modalias));
> + if (rc < 0) {
> + dev_err(&master->dev, "cannot find modalias for %s\n",
> + nc->full_name);
> + goto err_out;
> + }
> +
> + /* Device address */
> + rc = of_property_read_u32(nc, "reg", &value);
> + if (rc) {
> + dev_err(&master->dev, "%s has no valid 'reg' property (%d)\n",
> + nc->full_name, rc);
> + goto err_out;
> + }
> + spi->chip_select = value;
> +
> + /* Mode (clock phase/polarity/etc.) */
> + if (of_find_property(nc, "spi-cpha", NULL))
> + spi->mode |= SPI_CPHA;
> + if (of_find_property(nc, "spi-cpol", NULL))
> + spi->mode |= SPI_CPOL;
> + if (of_find_property(nc, "spi-cs-high", NULL))
> + spi->mode |= SPI_CS_HIGH;
> + if (of_find_property(nc, "spi-3wire", NULL))
> + spi->mode |= SPI_3WIRE;
> + if (of_find_property(nc, "spi-lsb-first", NULL))
> + spi->mode |= SPI_LSB_FIRST;
> +
> + /* Device DUAL/QUAD mode */
> + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {
> + switch (value) {
> + case 1:
> + break;
> + case 2:
> + spi->mode |= SPI_TX_DUAL;
> + break;
> + case 4:
> + spi->mode |= SPI_TX_QUAD;
> + break;
> + default:
> + dev_warn(&master->dev,
> + "spi-tx-bus-width %d not supported\n",
> + value);
> + break;
> + }
> + }
> +
> + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) {
> + switch (value) {
> + case 1:
> + break;
> + case 2:
> + spi->mode |= SPI_RX_DUAL;
> + break;
> + case 4:
> + spi->mode |= SPI_RX_QUAD;
> + break;
> + default:
> + dev_warn(&master->dev,
> + "spi-rx-bus-width %d not supported\n",
> + value);
> + break;
> + }
> + }
> +
> + /* Device speed */
> + rc = of_property_read_u32(nc, "spi-max-frequency", &value);
> + if (rc) {
> + dev_err(&master->dev, "%s has no valid 'spi-max-frequency' property (%d)\n",
> + nc->full_name, rc);
> + goto err_out;
> + }
> + spi->max_speed_hz = value;
> +
> + /* IRQ */
> + spi->irq = irq_of_parse_and_map(nc, 0);
> +
> + /* Store a pointer to the node in the device structure */
> + of_node_get(nc);
> + spi->dev.of_node = nc;
> +
> + /* Register the new device */
> + request_module("%s%s", SPI_MODULE_PREFIX, spi->modalias);
> + rc = spi_add_device(spi);
> + if (rc) {
> + dev_err(&master->dev, "spi_device register error %s\n",
> + nc->full_name);
> + goto err_out;
> + }
> +
> + return spi;
> +
> +err_out:
> + spi_dev_put(spi);
> + return ERR_PTR(rc);
> +}
> +
> /**
> * of_register_spi_devices() - Register child devices onto the SPI bus
> * @master: Pointer to spi_master device
> @@ -1229,120 +1346,63 @@ err_init_queue:
> */
> static void of_register_spi_devices(struct spi_master *master)
> {
> - struct spi_device *spi;
> struct device_node *nc;
> - int rc;
> - u32 value;
> + struct spi_device *spi;
>
> if (!master->dev.of_node)
> return;
>
> for_each_available_child_of_node(master->dev.of_node, nc) {
> - /* Alloc an spi_device */
> - spi = spi_alloc_device(master);
> - if (!spi) {
> - dev_err(&master->dev, "spi_device alloc error for %s\n",
> + spi = of_register_spi_device(master, nc);
> + if (IS_ERR(spi))
> + dev_warn(&master->dev, "Failed to create SPI device for %s\n",
> nc->full_name);
> - spi_dev_put(spi);
> - continue;
> - }
> + }
> +}
>
> - /* Select device driver */
> - if (of_modalias_node(nc, spi->modalias,
> - sizeof(spi->modalias)) < 0) {
> - dev_err(&master->dev, "cannot find modalias for %s\n",
> - nc->full_name);
> - spi_dev_put(spi);
> - continue;
> - }
> +static int of_dev_node_match(struct device *dev, void *data)
> +{
> + return dev->of_node == data;
> +}
>
> - /* Device address */
> - rc = of_property_read_u32(nc, "reg", &value);
> - if (rc) {
> - dev_err(&master->dev, "%s has no valid 'reg' property (%d)\n",
> - nc->full_name, rc);
> - spi_dev_put(spi);
> - continue;
> - }
> - spi->chip_select = value;
> -
> - /* Mode (clock phase/polarity/etc.) */
> - if (of_find_property(nc, "spi-cpha", NULL))
> - spi->mode |= SPI_CPHA;
> - if (of_find_property(nc, "spi-cpol", NULL))
> - spi->mode |= SPI_CPOL;
> - if (of_find_property(nc, "spi-cs-high", NULL))
> - spi->mode |= SPI_CS_HIGH;
> - if (of_find_property(nc, "spi-3wire", NULL))
> - spi->mode |= SPI_3WIRE;
> - if (of_find_property(nc, "spi-lsb-first", NULL))
> - spi->mode |= SPI_LSB_FIRST;
> -
> - /* Device DUAL/QUAD mode */
> - if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {
> - switch (value) {
> - case 1:
> - break;
> - case 2:
> - spi->mode |= SPI_TX_DUAL;
> - break;
> - case 4:
> - spi->mode |= SPI_TX_QUAD;
> - break;
> - default:
> - dev_warn(&master->dev,
> - "spi-tx-bus-width %d not supported\n",
> - value);
> - break;
> - }
> - }
> +/* bah; the match functions differ just by const-ness */
> +static int of_dev_node_match_const(struct device *dev, const void *data)
> +{
> + return dev->of_node == data;
> +}
>
> - if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) {
> - switch (value) {
> - case 1:
> - break;
> - case 2:
> - spi->mode |= SPI_RX_DUAL;
> - break;
> - case 4:
> - spi->mode |= SPI_RX_QUAD;
> - break;
> - default:
> - dev_warn(&master->dev,
> - "spi-rx-bus-width %d not supported\n",
> - value);
> - break;
> - }
> - }
> +/* must call put_device() when done with returned spi_device device */
> +struct spi_device *of_find_spi_device_by_node(struct device_node *node)
> +{
> + struct device *dev;
>
> - /* Device speed */
> - rc = of_property_read_u32(nc, "spi-max-frequency", &value);
> - if (rc) {
> - dev_err(&master->dev, "%s has no valid 'spi-max-frequency' property (%d)\n",
> - nc->full_name, rc);
> - spi_dev_put(spi);
> - continue;
> - }
> - spi->max_speed_hz = value;
> + dev = bus_find_device(&spi_bus_type, NULL, node,
> + of_dev_node_match);
> + if (!dev)
> + return NULL;
>
> - /* IRQ */
> - spi->irq = irq_of_parse_and_map(nc, 0);
> + return to_spi_device(dev);
> +}
> +EXPORT_SYMBOL(of_find_spi_device_by_node);
>
> - /* Store a pointer to the node in the device structure */
> - of_node_get(nc);
> - spi->dev.of_node = nc;
> +/* forward decl */
> +static struct class spi_master_class;
>
> - /* Register the new device */
> - request_module("%s%s", SPI_MODULE_PREFIX, spi->modalias);
> - rc = spi_add_device(spi);
> - if (rc) {
> - dev_err(&master->dev, "spi_device register error %s\n",
> - nc->full_name);
> - spi_dev_put(spi);
> - }
> +/* the spi masters are not using spi_bus, so we find it with another way */
> +struct spi_master *of_find_spi_master_by_node(struct device_node *node)
> +{
> + struct device *dev;
>
> - }
> + dev = class_find_device(&spi_master_class, NULL, node,
> + of_dev_node_match_const);
> + if (!dev)
> + return NULL;
> +
> + /* reference got in class_find_device */
> + return container_of(dev, struct spi_master, dev);
> }
> +EXPORT_SYMBOL(of_find_spi_master_by_node);
> +
> #else
> static void of_register_spi_devices(struct spi_master *master) { }
> #endif
>
--
Best regards,
Alexander Sverdlin.
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