Hi Boris,
On 05.07.2018 14:39, Boris Brezillon wrote:
Hi Frieder,
On Thu, 5 Jul 2018 13:14:57 +0200
Frieder Schrempf <frieder.schrempf@xxxxxxxxx> wrote:
When porting (Q)SPI controller drivers from the MTD layer to the SPI
layer, the naming scheme for the memory devices changes. To be able
to keep compatibility with the old drivers naming scheme, a function
is added to the SPI mem interface to let controller drivers set a
custom name for the memory.
Example for the FSL QSPI driver:
Name with the old driver: 21e0000.qspi,
or with multiple devices: 21e0000.qspi-0, 21e0000.qspi-1, ...
Name with the new driver without spi_mem_get_name: spi4.0
Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxx>
---
Changes in v2:
==============
* Add a name field to struct spi_mem and fill it while probing
drivers/spi/spi-mem.c | 30 ++++++++++++++++++++++++++++++
include/linux/spi/spi-mem.h | 7 ++++++-
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 990770d..048101c 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -311,6 +311,26 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
EXPORT_SYMBOL_GPL(spi_mem_exec_op);
/**
+ * spi_mem_get_name() - Let drivers using the SPI mem interface specify a
+ * custom name for the memory to avoid compatibility
+ * issues with ported drivers.
You're not describing what this function does, but why it was
introduced. Not sure the spi-mem user/driver cares about that, these are
just internal details. Probably something you should put in the
->get_name() hook doc.
Ok. You're right.
+ * @mem: the SPI memory
+ *
+ * When porting (Q)SPI controller drivers from the MTD layer to the SPI
+ * layer, the naming scheme for the memory devices changes. To be able to
+ * keep compatibility with the old drivers naming scheme, this function can
+ * be used to get a custom name from the controller driver.
+ * If no custom name is available, the name of the SPI device is returned.
Ditto. Just say that this function returns the spi-mem device name which
can be used by the upper layer if they need to expose a user-friendly
name.
Ok.
+ *
+ * Return: a char array that contains the name for the flash memory
^ a string?
Return: a string containing the name of the memory device to be
used by the spi-mem user
Ok.
+ */
+const char *spi_mem_get_name(struct spi_mem *mem)
+{
+ return mem->name;
+}
+EXPORT_SYMBOL_GPL(spi_mem_get_name);
+
+/**
* spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
* match controller limitations
* @mem: the SPI memory
@@ -344,6 +364,7 @@ static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
static int spi_mem_probe(struct spi_device *spi)
{
struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver);
+ struct spi_controller *ctlr = spi->controller;
struct spi_mem *mem;
mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL);
@@ -351,6 +372,15 @@ static int spi_mem_probe(struct spi_device *spi)
return -ENOMEM;
mem->spi = spi;
+
+ if (ctlr->mem_ops && ctlr->mem_ops->get_name)
+ mem->name = ctlr->mem_ops->get_name(mem);
+ else
+ mem->name = dev_name(&spi->dev);
+
+ if (IS_ERR_OR_NULL(mem->name))
+ return PTR_ERR(mem->name);
+
spi_set_drvdata(spi, mem);
return memdrv->probe(mem);
diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 4fa34a2..c3f82d1 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -124,7 +124,8 @@ struct spi_mem_op {
/**
* struct spi_mem - describes a SPI memory device
* @spi: the underlying SPI device
- * @drvpriv: spi_mem_drviver private data
+ * @drvpriv: spi_mem_driver private data
Can you fix this typo in a separate patch?
Ok. I'll move it to a separate patch.
+ * @name: name of the SPI memory device
*
* Extra information that describe the SPI memory device and may be needed by
* the controller to properly handle this device should be placed here.
@@ -135,6 +136,7 @@ struct spi_mem_op {
struct spi_mem {
struct spi_device *spi;
void *drvpriv;
+ char *name;
};
/**
@@ -178,6 +180,7 @@ struct spi_controller_mem_ops {
const struct spi_mem_op *op);
int (*exec_op)(struct spi_mem *mem,
const struct spi_mem_op *op);
+ const char *(*get_name)(struct spi_mem *mem);
You forgot to document this hook. Also, it's important to mention that
if the name returned by this function is dynamically allocated, it
should be allocated with devm_xxxx(), because we don't have a
->free_name() function.
Indeed. I'll add the documentation.
Thanks,
Frieder
};
/**
@@ -236,6 +239,8 @@ bool spi_mem_supports_op(struct spi_mem *mem,
int spi_mem_exec_op(struct spi_mem *mem,
const struct spi_mem_op *op);
+const char *spi_mem_get_name(struct spi_mem *mem);
+
int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
struct module *owner);
Thanks,
Boris
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