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authorShawn Guo <shawn.guo@linaro.org>2016-07-08 17:00:41 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-31 15:24:23 +0200
commit2426fbc77faef57c80a573303af6543531e2efa3 (patch)
treec86998c69689e206090d843d04aa6690b2ddd552 /include/linux/amba
parent9c267ddb41a6108761c82bf7444ea5e6eacc8222 (diff)
tty: amba-pl011: probe ZTE device from AMBA bus with a pseudo-ID
There is no Peripheral Identification Registers on ZTE PL011 device, so although the driver amba-pl011 is ready to work for ZTE device, the device cannot be probed by the driver at all. With arm,primecell-periphid DT bindings (bindings/arm/primecell.txt) in place, it should be the cleanest the way to use a pseudo-ID to probe the device from AMBA bus. We create an unofficial vendor number AMBA_VENDOR_LINUX, which will practically never become an official vendor ID, and takes Configuration, Revision number, and Part number as input to compose a pseudo-ID for ZTE device. Also, since we start using vendor_zte to probe ZTE device, the __maybe_unused for vendor_zte is removed. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/amba')
-rw-r--r--include/linux/amba/bus.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index 3d8dcdd1aeae..d143c13bed26 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -53,8 +53,14 @@ enum amba_vendor {
AMBA_VENDOR_ST = 0x80,
AMBA_VENDOR_QCOM = 0x51,
AMBA_VENDOR_LSI = 0xb6,
+ AMBA_VENDOR_LINUX = 0xfe, /* This value is not official */
};
+/* This is used to generate pseudo-ID for AMBA device */
+#define AMBA_LINUX_ID(conf, rev, part) \
+ (((conf) & 0xff) << 24 | ((rev) & 0xf) << 20 | \
+ AMBA_VENDOR_LINUX << 12 | ((part) & 0xfff))
+
extern struct bus_type amba_bustype;
#define to_amba_device(d) container_of(d, struct amba_device, dev)