diff options
| author | Benedikt Niedermayr <benedikt.niedermayr@siemens.com> | 2022-11-02 14:30:46 +0100 |
|---|---|---|
| committer | Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> | 2022-11-02 10:02:39 -0400 |
| commit | 89aed3cd5cb951113b766cddd9c2df43cfbdafd5 (patch) | |
| tree | 01edea5ecb86490a53775eded27100f2a5e43df5 /include | |
| parent | 3821e96a01d658e770074331b56cec88c169a418 (diff) | |
memory: omap-gpmc: wait pin additions
This patch introduces support for setting the wait-pin polarity as well
as using the same wait-pin for different CS regions.
The waitpin polarity can be configured via the WAITPIN<X>POLARITY bits
in the GPMC_CONFIG register. This is currently not supported by the
driver. This patch adds support for setting the required register bits
with the "ti,wait-pin-polarity" dt-property.
The wait-pin can also be shared between different CS regions for special
usecases. Therefore GPMC must keep track of wait-pin allocations, so it
knows that either GPMC itself or another driver has the ownership.
Signed-off-by: Benedikt Niedermayr <benedikt.niedermayr@siemens.com>
Link: https://lore.kernel.org/r/20221102133047.1654449-2-benedikt.niedermayr@siemens.com
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/platform_data/gpmc-omap.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/platform_data/gpmc-omap.h b/include/linux/platform_data/gpmc-omap.h index c9cc4e32435d..296b080c5c67 100644 --- a/include/linux/platform_data/gpmc-omap.h +++ b/include/linux/platform_data/gpmc-omap.h @@ -136,6 +136,13 @@ struct gpmc_device_timings { #define GPMC_MUX_AAD 1 /* Addr-Addr-Data multiplex */ #define GPMC_MUX_AD 2 /* Addr-Data multiplex */ +/* Wait pin polarity values */ +#define GPMC_WAITPINPOLARITY_INVALID -1 +#define GPMC_WAITPINPOLARITY_ACTIVE_LOW 0 +#define GPMC_WAITPINPOLARITY_ACTIVE_HIGH 1 + +#define GPMC_WAITPIN_INVALID -1 + struct gpmc_settings { bool burst_wrap; /* enables wrap bursting */ bool burst_read; /* enables read page/burst mode */ @@ -149,6 +156,7 @@ struct gpmc_settings { u32 device_width; /* device bus width (8 or 16 bit) */ u32 mux_add_data; /* multiplex address & data */ u32 wait_pin; /* wait-pin to be used */ + u32 wait_pin_polarity; }; /* Data for each chip select */ |