ARM: at91: add clk_lookup entry for RTT devices

First export the clk32k clk.
Then add clk_lookup entries for RTT devices so that rtc-at91sam9 driver
can retrieve and manipulate the slow clk.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

7 files changed, 14 insertions, 1 deletions

diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index aab1f969a7c3..990b82fdd409 100644
--- a/arch/arm/mach-at91/at91sam9260.c
+++ b/arch/arm/mach-at91/at91sam9260.c
@@ -217,6 +217,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID("pclk", "fffbc000.ssc", &ssc_clk),
         CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9260.0", &twi_clk),
         CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9g20.0", &twi_clk),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
         /* more usart lookup table for DT entries */
         CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
         CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -237,6 +238,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID("mci_clk", "fffa8000.mmc", &mmc_clk),
         CLKDEV_CON_DEV_ID("spi_clk", "fffc8000.spi", &spi0_clk),
         CLKDEV_CON_DEV_ID("spi_clk", "fffcc000.spi", &spi1_clk),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
         /* fake hclk clock */
         CLKDEV_CON_DEV_ID("hclk", "at91_ohci", &ohci_clk),
         CLKDEV_CON_ID("pioA", &pioA_clk),
diff --git a/arch/arm/mach-at91/at91sam9261.c b/arch/arm/mach-at91/at91sam9261.c
index a8bd35963332..a23b3cfbc6af 100644
--- a/arch/arm/mach-at91/at91sam9261.c
+++ b/arch/arm/mach-at91/at91sam9261.c
@@ -192,6 +192,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_ID("pioA", &pioA_clk),
         CLKDEV_CON_ID("pioB", &pioB_clk),
         CLKDEV_CON_ID("pioC", &pioC_clk),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
         /* more lookup table for DT entries */
         CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
         CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -209,6 +210,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID(NULL, "fffff400.gpio", &pioA_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 };
 
 static struct clk_lookup usart_clocks_lookups[] = {
diff --git a/arch/arm/mach-at91/at91sam9263.c b/arch/arm/mach-at91/at91sam9263.c
index fbff228cc63e..1082fd488263 100644
--- a/arch/arm/mach-at91/at91sam9263.c
+++ b/arch/arm/mach-at91/at91sam9263.c
@@ -201,6 +201,8 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID("t0_clk", "atmel_tcb.0", &tcb_clk),
         CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9260.0", &twi_clk),
         CLKDEV_CON_DEV_ID(NULL, "at91sam9rl-pwm", &pwm_clk),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.1", &clk32k),
         /* fake hclk clock */
         CLKDEV_CON_DEV_ID("hclk", "at91_ohci", &ohci_clk),
         CLKDEV_CON_ID("pioA", &pioA_clk),
@@ -227,6 +229,8 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioCDE_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioCDE_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffb8000.pwm", &pwm_clk),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd50.rtc", &clk32k),
 };
 
 static struct clk_lookup usart_clocks_lookups[] = {
diff --git a/arch/arm/mach-at91/at91sam9g45.c b/arch/arm/mach-at91/at91sam9g45.c
index 405427ec05f8..9c4c4cebfdf1 100644
--- a/arch/arm/mach-at91/at91sam9g45.c
+++ b/arch/arm/mach-at91/at91sam9g45.c
@@ -254,6 +254,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID(NULL, "atmel_tdes", &aestdessha_clk),
         CLKDEV_CON_DEV_ID(NULL, "atmel_aes", &aestdessha_clk),
         CLKDEV_CON_DEV_ID(NULL, "at91sam9rl-pwm", &pwm_clk),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
         /* more usart lookup table for DT entries */
         CLKDEV_CON_DEV_ID("usart", "ffffee00.serial", &mck),
         CLKDEV_CON_DEV_ID("usart", "fff8c000.serial", &usart0_clk),
@@ -280,6 +281,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioC_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioDE_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioDE_clk),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 
         CLKDEV_CON_ID("pioA", &pioA_clk),
         CLKDEV_CON_ID("pioB", &pioB_clk),
diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index f553e4ea034b..40c815c62742 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -205,6 +205,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_ID("pioB", &pioB_clk),
         CLKDEV_CON_ID("pioC", &pioC_clk),
         CLKDEV_CON_ID("pioD", &pioD_clk),
+        CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
         /* more lookup table for DT entries */
         CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
         CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -223,6 +224,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),
         CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioD_clk),
+        CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
         CLKDEV_CON_ID("adc_clk", &tsc_clk),
 };
 
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index d66f102c352a..f569e4826848 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -115,7 +115,7 @@ static u32 at91_pllb_usb_init;
  * 48 MHz (unless no USB function clocks are needed).  The main clock and
  * both PLLs are turned off to run in "slow clock mode" (system suspend).
  */
-static struct clk clk32k = {
+struct clk clk32k = {
         .name           = "clk32k",
         .rate_hz        = AT91_SLOW_CLOCK,
         .users          = 1,            /* always on */
diff --git a/arch/arm/mach-at91/clock.h b/arch/arm/mach-at91/clock.h
index a98a39bbd883..6eb825abbdde 100644
--- a/arch/arm/mach-at91/clock.h
+++ b/arch/arm/mach-at91/clock.h
@@ -34,6 +34,7 @@ struct clk {
 extern int __init clk_register(struct clk *clk);
 extern struct clk mck;
 extern struct clk utmi_clk;
+extern struct clk clk32k;
 
 #define CLKDEV_CON_ID(_id, _clk)                        \
         {                                               \