of_gpio_spi_cs_get_count(9)

💅 of_gpio_spi_cs_get_count — Kernel API Manual ✨

okay so bestie, we're in the Kernel API Manual and this page is literally called of_gpio_spi_cs_get_count(9), which is the special GPIO counting situation for SPI. yes it's a mouthful, no we're not changing it, it's iconic 🎀

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🌸 NAME 🌸

of_gpio_spi_cs_get_count — special GPIO counting for SPI. that's the whole vibe. ✨

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🦋 SYNOPSIS 🦋

int of_gpio_spi_cs_get_count (const struct device_node *np , const char
*con_id );

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🎀 ARGUMENTS 🎀

• np — the Consuming device node, aka the one doing the consuming, main character energy 👑
• con_id — the Function within the GPIO consumer. like, which function is this consumer even doing rn

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💖 DESCRIPTION 💖

so here's the tea, bestie: some elder GPIO controllers have special quirks. not bad, just... built different. currently we handle the Freescale and PPC GPIO controller, whose bindings lowkey refuse to use the established "cs-gpios" for chip selects and instead rely on "gpios" for the chip select lines. the way that is so not the standard 😭

if we detect this situation, we redirect the counting of "cs-gpios" to count "gpios" instead — fully transparent to the driver. nobody even notices. slay 🫶

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🔥 RETURN 🔥

you get either the number of GPIOs defined in the property, or:

• -EINVAL if the "gpios" property is incorrectly formed (malformed bestie, it's giving broken)
• -ENOENT if the "gpios" property is just... missing. gone. not here. 💀

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🧚 SEE ALSO 🧚

Kernel file ./drivers/gpio/gpiolib-of.c plus the whole friend group: of_gpio_named_count(9), of_get_named_gpiod_flags(9), of_gpiochip_remove_hog(9), of_gpio_twocell_xlate(9), of_gpio_threecell_xlate(9). iykyk 💜

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ngl, if you're messing with "gpios" properties on Freescale or PPC hardware, read this twice. the redirect is transparent, but the errors are not shy about showing up.

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that's a wrap, bestie! 🌈 this little gem lives over in ./drivers/gpio, dated October 2026, and it's filed under the Kernel API Manual — go be obsessed with it responsibly ⭐💅