spi: pxa2xx: Allow number of chip select pins to be read from property

In some cases the number of the chip select pins might come from
the device property. Allow driver to use it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240417110334.2671228-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx.c

@@ -1357,6 +1357,7 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 	struct ssp_device *ssp = NULL;
 	const void *match;
 	bool is_lpss_priv;
+	u32 num_cs = 1;
 	int status;
 
 	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
@@ -1395,8 +1396,11 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 		pdata->dma_filter = pxa2xx_spi_idma_filter;
 	}
 
+	/* Read number of chip select pins, if provided */
+	device_property_read_u32(dev, "num-cs", &num_cs);
+
+	pdata->num_chipselect = num_cs;
 	pdata->is_target = device_property_read_bool(dev, "spi-slave");
-	pdata->num_chipselect = 1;
 	pdata->enable_dma = true;
 	pdata->dma_burst_size = 1;