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In order to support device tree probing of Versatile NOR flash chips, there must be a way to add the VPP (write protection) enable/disable callback. The register in question is in the system controllers of these machines. Apart from this quirk, the ARM flash chips are standard CFI flash chips from various vendors. Additionally, the Integrator/AP require you to set up the external bus interface (EBI) to allow writes to the chip select where the flash memory is connected. Solve this by looking for the arm,versatile-flash compatible string in the flash device tree node. In the driver, add a special hook to check for the various Versatile syscons and register a callback for .set_vpp() if this compatible is present. Provide a special Kconfig entry for the addon hook so it will not be compiled in if the Versatile boards are not supported. Stubs in the header file make sure the impact will be zero on other platforms. (Compilers optimze this out.) With this patch, a large slew of ARM board file code can be removed. Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
16 lines
374 B
C
16 lines
374 B
C
#include <linux/of.h>
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#include <linux/mtd/map.h>
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#ifdef CONFIG_MTD_PHYSMAP_OF_VERSATILE
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int of_flash_probe_versatile(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map);
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#else
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static inline
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int of_flash_probe_versatile(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map)
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{
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return 0;
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}
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#endif
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