On Tue, 7 Aug 2018 00:29:09 +0200
Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> wrote:
> Data port used by Amstrad Delta NAND driver is actually an OMAP MPUIO
> device, already under control of gpio-omap driver. The NAND driver
> gets access to the port by ioremapping it and performs read/write
> operations. That is done without any proteciton from other users
> legally manipulating the port pins over GPIO API.
>
> The plan is to convert the driver to access the port over GPIO consumer
> API. Before that is implemented, the driver can already obtain
> exclusive access to the port by requesting an array of its GPIO
> descriptors.
>
> Add respective entries to the NAND GPIO lookup table.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
> ---
> arch/arm/mach-omap1/board-ams-delta.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index eedacdfe9725..16f7bbe47607 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -337,7 +337,8 @@ static struct platform_device ams_delta_nand_device = {
> .resource = ams_delta_nand_resources,
> };
>
> -#define OMAP_GPIO_LABEL "gpio-0-15"
> +#define OMAP_GPIO_LABEL "gpio-0-15"
> +#define OMAP_MPUIO_LABEL "mpuio"
>
> static struct gpiod_lookup_table ams_delta_nand_gpio_table = {
> .table = {
> @@ -349,6 +350,14 @@ static struct gpiod_lookup_table ams_delta_nand_gpio_table = {
> GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NWE, "nwe", 0),
> GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_ALE, "ale", 0),
> GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_CLE, "cle", 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 0, "data", 0, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 1, "data", 1, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 2, "data", 2, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 3, "data", 3, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 4, "data", 4, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 5, "data", 5, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 6, "data", 6, 0),
> + GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 7, "data", 7, 0),
> { },
> },
> };
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