[PATCH] spi: Fix probing SPI drivers without a cs-gpios node

[John Watts]

Hi there,

Yes it would be possible to refactor it to do that.
Would it be worth it for these few instances?

John

On Sun, Jan 22, 2023 at 08:06:04PM +0300, Alexander Shiyan wrote:
> Hello.
> 
> These lines can be defined as a regular function like
> get_cs_gpio_cound(node), isn't it?
> 
> вс, 22 янв. 2023 г. в 18:06, John Watts <contact at jookia.org>:
> >
> > of_gpio_named_count returns a negative value on error but this
> > is discarded and cast to a u16, making error handling impossible.
> >
> > With debug logging enabled this effectively halts booting so the board can
> > print an error over serial 65534 times.
> >
> > Check for this error and proceed as if there are no gpios specified.
> >
> > Signed-off-by: John Watts <contact at jookia.org>
> > ---
> >  drivers/spi/atmel_spi.c | 8 +++++++-
> >  drivers/spi/imx_spi.c   | 8 +++++++-
> >  drivers/spi/stm32_spi.c | 8 +++++++-
> >  3 files changed, 21 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
> > index ec90330e53..a2314be8ee 100644
> > --- a/drivers/spi/atmel_spi.c
> > +++ b/drivers/spi/atmel_spi.c
> > @@ -388,6 +388,7 @@ static int atmel_spi_probe(struct device_d *dev)
> >         struct resource *iores;
> >         int ret = 0;
> >         int i;
> > +       int num_gpios;
> >         struct spi_master *master;
> >         struct device_node *node = dev->device_node;
> >         struct atmel_spi *as;
> > @@ -408,7 +409,12 @@ static int atmel_spi_probe(struct device_d *dev)
> >                 master->num_chipselect = pdata->num_chipselect;
> >                 as->cs_pins = pdata->chipselect;
> >         } else {
> > -               master->num_chipselect = of_gpio_named_count(node, "cs-gpios");
> > +               num_gpios = of_gpio_named_count(node, "cs-gpios");
> > +               if (num_gpios < 0) {
> > +                       num_gpios = 0;
> > +               }
> > +
> > +               master->num_chipselect = num_gpios;
> >                 as->cs_pins = xzalloc(sizeof(u32) * master->num_chipselect);
> >
> >                 for (i = 0; i < master->num_chipselect; i++) {
> > diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c
> > index 3e0ad2db00..b10076639a 100644
> > --- a/drivers/spi/imx_spi.c
> > +++ b/drivers/spi/imx_spi.c
> > @@ -564,11 +564,17 @@ static int imx_spi_dt_probe(struct imx_spi *imx)
> >  {
> >         struct device_node *node = imx->master.dev->device_node;
> >         int i;
> > +       int num_gpios;
> >
> >         if (!node)
> >                 return -ENODEV;
> >
> > -       imx->master.num_chipselect = of_gpio_named_count(node, "cs-gpios");
> > +       num_gpios = of_gpio_named_count(node, "cs-gpios");
> > +       if (num_gpios < 0) {
> > +               num_gpios = 0;
> > +       }
> > +
> > +       imx->master.num_chipselect = num_gpios;
> >         imx->cs_array = xzalloc(sizeof(u32) * imx->master.num_chipselect);
> >
> >         for (i = 0; i < imx->master.num_chipselect; i++)
> > diff --git a/drivers/spi/stm32_spi.c b/drivers/spi/stm32_spi.c
> > index 639c4f1740..a34e0b143d 100644
> > --- a/drivers/spi/stm32_spi.c
> > +++ b/drivers/spi/stm32_spi.c
> > @@ -513,8 +513,14 @@ static void stm32_spi_dt_probe(struct stm32_spi_priv *priv)
> >  {
> >         struct device_node *node = priv->master.dev->device_node;
> >         int i;
> > +       int num_gpios;
> >
> > -       priv->master.num_chipselect = of_gpio_named_count(node, "cs-gpios");
> > +       num_gpios = of_gpio_named_count(node, "cs-gpios");
> > +       if (num_gpios < 0) {
> > +               num_gpios = 0;
> > +       }
> > +
> > +       priv->master.num_chipselect = num_gpios;
> >         priv->cs_gpios = xzalloc(sizeof(u32) * priv->master.num_chipselect);
> >
> >         for (i = 0; i < priv->master.num_chipselect; i++)
> > --
> > 2.39.0
> >
> >