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spi: gpio: Support a single always-selected device

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The generic SPI code, the SPI GPIO driver functions support
a single always-connected device cases. The only impediment
is that board instantiation prevents that from happening.
Update spi_gpio_probe_pdata() checks to support the mentioned
hardware setup.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250205132127.742750-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2025-02-05 15:19:20 +02:00 committed by Mark Brown
parent c108905a74
commit 25fac20edd
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1 changed files with 5 additions and 6 deletions
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11
drivers/spi/spi-gpio.c
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@ -313,15 +313,14 @@ static int spi_gpio_probe_pdata(struct platform_device *pdev,
struct spi_gpio *spi_gpio = spi_controller_get_devdata(host);
int i;
if (!pdata || !pdata->num_chipselect)
if (!pdata)
return -ENODEV;
/*
* The host needs to think there is a chipselect even if not
* connected
*/
host->num_chipselect = pdata->num_chipselect ?: 1;
/* It's just one always-selected device, fine to continue */
if (!pdata->num_chipselect)
return 0;
host->num_chipselect = pdata->num_chipselect;
spi_gpio->cs_gpios = devm_kcalloc(dev, host->num_chipselect,
sizeof(*spi_gpio->cs_gpios),
GFP_KERNEL);