ARM: 6124/1: ep93xx: SPI driver platform support code
This patch adds platform side support code for the EP93xx SPI
driver. This includes clock, resources and muxing. There is a new
function: ep93xx_register_spi() which can be used by board support
code to register new SPI devices for the board.
This patch depends on patch
5998/1 ep93xx: added chip revision reading function
Cc: Ryan Mallon <ryan@bluewatersys.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Martin Guy <martinwguy@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 5f80092..e29bdef 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -96,6 +96,10 @@
.enable_mask = EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
.set_rate = set_keytchclk_rate,
};
+static struct clk clk_spi = {
+ .parent = &clk_xtali,
+ .rate = EP93XX_EXT_CLK_RATE,
+};
static struct clk clk_pwm = {
.parent = &clk_xtali,
.rate = EP93XX_EXT_CLK_RATE,
@@ -186,6 +190,7 @@
INIT_CK("ep93xx-ohci", NULL, &clk_usb_host),
INIT_CK("ep93xx-keypad", NULL, &clk_keypad),
INIT_CK("ep93xx-fb", NULL, &clk_video),
+ INIT_CK("ep93xx-spi.0", NULL, &clk_spi),
INIT_CK(NULL, "pwm_clk", &clk_pwm),
INIT_CK(NULL, "m2p0", &clk_m2p0),
INIT_CK(NULL, "m2p1", &clk_m2p1),
@@ -473,6 +478,14 @@
/* Initialize the pll2 derived clocks */
clk_usb_host.rate = clk_pll2.rate / (((value >> 28) & 0xf) + 1);
+ /*
+ * EP93xx SSP clock rate was doubled in version E2. For more information
+ * see:
+ * http://www.cirrus.com/en/pubs/appNote/AN273REV4.pdf
+ */
+ if (ep93xx_chip_revision() < EP93XX_CHIP_REV_E2)
+ clk_spi.rate /= 2;
+
pr_info("PLL1 running at %ld MHz, PLL2 at %ld MHz\n",
clk_pll1.rate / 1000000, clk_pll2.rate / 1000000);
pr_info("FCLK %ld MHz, HCLK %ld MHz, PCLK %ld MHz\n",