Piecuu/linux-samsung-r9q2
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

memory: omap-gpmc: wait pin additions

Browse source 
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>
This commit is contained in:
Benedikt Niedermayr 2022-11-02 14:30:46 +01:00 • committed by Krzysztof Kozlowski
parent 3821e96a01
commit 89aed3cd5c
2 changed files with 117 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

8
include/linux/platform_data/gpmc-omap.h
View file

@ -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 */