Message ID | 20220523074017.12649-1-axe.yang@mediatek.com |
---|---|
Headers | show |
Series | mmc: mediatek: add support for SDIO async IRQ | expand |
Il 23/05/22 09:40, Axe Yang ha scritto: > Add support for eint IRQ when MSDC is used as an SDIO host. This > feature requires SDIO device support async IRQ function. With this > feature, SDIO host can be awakened by SDIO card in suspend state, > without additional pin. > > MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC > turn off clock and switch SDIO DAT1 pin to GPIO mode. And during > resume, switch GPIO function back to DAT1 mode then turn on clock. > > Some device tree property should be added or modified in MSDC node > to support SDIO eint IRQ. Pinctrls "state_eint" is mandatory. Since > this feature depends on asynchronous interrupts, "wakeup-source", > "keep-power-in-suspend" and "cap-sdio-irq" flags are necessary, and > the interrupts list should be extended(the interrupt named with > sdio_wakeup): > &mmcX { > ... > interrupt-names = "msdc", "sdio_wakeup"; > interrupts-extended = <...>, > <&pio xxx IRQ_TYPE_LEVEL_LOW>; > ... > pinctrl-names = "default", "state_uhs", "state_eint"; > ... > pinctrl-2 = <&mmc2_pins_eint>; > ... > cap-sdio-irq; > keep-power-in-suspend; > wakeup-source; > ... > }; > > Co-developed-by: Yong Mao <yong.mao@mediatek.com> > Signed-off-by: Yong Mao <yong.mao@mediatek.com> > Signed-off-by: Axe Yang <axe.yang@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>