Hi Vladimir,
Thanks for the comment.
On Wed, 2022-05-04 at 23:07 +0300, Vladimir Oltean wrote:
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>
> On Wed, May 04, 2022 at 08:47:49PM +0530, Arun Ramadoss wrote:
> > This patch add the SPI driver for the LAN937x switches. It uses the
> > lan937x_main.c and lan937x_dev.c functions.
> >
> > Signed-off-by: Arun Ramadoss <arun.ramadoss@xxxxxxxxxxxxx>
> > ---
> > drivers/net/dsa/microchip/Makefile | 1 +
> > drivers/net/dsa/microchip/ksz_common.h | 1 +
> > drivers/net/dsa/microchip/lan937x_dev.c | 7 +
> > drivers/net/dsa/microchip/lan937x_spi.c | 236
> > ++++++++++++++++++++++++
> > 4 files changed, 245 insertions(+)
> > create mode 100644 drivers/net/dsa/microchip/lan937x_spi.c
> >
> > diff --git a/drivers/net/dsa/microchip/Makefile
> > b/drivers/net/dsa/microchip/Makefile
> > index d32ff38dc240..28d8eb62a795 100644
> > --- a/drivers/net/dsa/microchip/Makefile
> > +++ b/drivers/net/dsa/microchip/Makefile
> > @@ -10,3 +10,4 @@ obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ8863_SMI) +=
> > ksz8863_smi.o
> > obj-$(CONFIG_NET_DSA_MICROCHIP_LAN937X) += lan937x.o
> > lan937x-objs := lan937x_dev.o
> > lan937x-objs += lan937x_main.o
> > +lan937x-objs += lan937x_spi.o
> > diff --git a/drivers/net/dsa/microchip/ksz_common.h
> > b/drivers/net/dsa/microchip/ksz_common.h
> > index 5671f580948d..fd9e0705d2d2 100644
> > --- a/drivers/net/dsa/microchip/ksz_common.h
> > +++ b/drivers/net/dsa/microchip/ksz_common.h
> > @@ -151,6 +151,7 @@ void ksz_switch_remove(struct ksz_device *dev);
> > int ksz8_switch_register(struct ksz_device *dev);
> > int ksz9477_switch_register(struct ksz_device *dev);
> > int lan937x_switch_register(struct ksz_device *dev);
> > +int lan937x_check_device_id(struct ksz_device *dev);
> >
> > void ksz_update_port_member(struct ksz_device *dev, int port);
> > void ksz_init_mib_timer(struct ksz_device *dev);
> > diff --git a/drivers/net/dsa/microchip/lan937x_dev.c
> > b/drivers/net/dsa/microchip/lan937x_dev.c
> > index 3f1797cc1d16..f430a8711775 100644
> > --- a/drivers/net/dsa/microchip/lan937x_dev.c
> > +++ b/drivers/net/dsa/microchip/lan937x_dev.c
> > @@ -386,8 +386,15 @@ static int lan937x_mdio_register(struct
> > ksz_device *dev)
> >
> > static int lan937x_switch_init(struct ksz_device *dev)
> > {
> > + int ret;
> > +
> > dev->ds->ops = &lan937x_switch_ops;
> >
> > + /* Check device tree */
> > + ret = lan937x_check_device_id(dev);
> > + if (ret < 0)
> > + return ret;
> > +
>
> Can't this be called from lan937x_spi_probe() directly, why do you
> need
> to go through lan937x_switch_register() first?
lan937x_check_device_id function compares the dev->chip_id with the
lan937x_switch_chip array and populate the some of the parameters of
struct ksz_dev. The dev->chip_id is populated using the dev->dev_ops-
>detect in the ksz_switch_register function. If lan937x_check_device_id
needs to be called in spi_probe, then chip_id has to be identified as
part of spi_probe function. Since ksz_switch_register handles the
identifying the chip_id, checking the device_id is part of switch_init.
if (dev->dev_ops->detect(dev))
return -EINVAL;
ret = dev->dev_ops->init(dev);
if (ret)
return ret;
As per the comment, enable_spi_indirect_access function called twice
https://lore.kernel.org/netdev/20220408232557.b62l3lksotq5vuvm@skbuf/
I have removed the enable_spi_indirect_access in the lan937x_setup
function in v13 patch 6. But it actually failed our regression.
The SPI indirect is required for accessing the Internal phy registers.
We have enabled it in lan937x_init before registering the
mdio_register. We need it for reading the phy id.
And another place enabled in lan937x_setup after lan937x_switch_reset
function. When I removed enabling in setup function, switch_reset
disables the spi indirecting addressing. Because of that further phy
register r/w fails. In Summary, we need to enable spi indirect access
in both the places, one for mdio_register and another after
switch_reset.
Can I enable it both the places? Kindly suggest.
>
> > dev->port_mask = (1 << dev->port_cnt) - 1;
> >
> > dev->ports = devm_kzalloc(dev->dev,
