diff options
Diffstat (limited to 'target/linux/xburst/patches-3.10/007-RTC-JZ4740-Init-the-regulator-register-on-startup.patch')
| -rw-r--r-- | target/linux/xburst/patches-3.10/007-RTC-JZ4740-Init-the-regulator-register-on-startup.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-3.10/007-RTC-JZ4740-Init-the-regulator-register-on-startup.patch b/target/linux/xburst/patches-3.10/007-RTC-JZ4740-Init-the-regulator-register-on-startup.patch new file mode 100644 index 0000000..8dfae3a --- /dev/null +++ b/target/linux/xburst/patches-3.10/007-RTC-JZ4740-Init-the-regulator-register-on-startup.patch @@ -0,0 +1,61 @@ +From aff616f4a33bd3a9ab1506fdbe97fcfe285cb7b0 Mon Sep 17 00:00:00 2001 +From: Paul Cercueil <paul@crapouillou.net> +Date: Thu, 13 Sep 2012 00:09:20 +0200 +Subject: [PATCH 07/16] RTC: JZ4740: Init the "regulator" register on startup. + +This register controls the accuracy of the RTC. uC/OS-II use +the RTC as a 100Hz clock, and writes a completely wrong value +on that register, that we have to overwrite if we want a working +real-time clock. + +Signed-off-by: Paul Cercueil <paul@crapouillou.net> +Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> +--- + drivers/rtc/rtc-jz4740.c | 17 +++++++++++++++++ + 1 file changed, 17 insertions(+) + +diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c +index 1e48686..722fb0c 100644 +--- a/drivers/rtc/rtc-jz4740.c ++++ b/drivers/rtc/rtc-jz4740.c +@@ -14,6 +14,7 @@ + * + */ + ++#include <linux/clk.h> + #include <linux/kernel.h> + #include <linux/module.h> + #include <linux/platform_device.h> +@@ -215,6 +216,7 @@ static int jz4740_rtc_probe(struct platform_device *pdev) + int ret; + struct jz4740_rtc *rtc; + uint32_t scratchpad; ++ struct clk *rtc_clk; + + rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); + if (!rtc) +@@ -280,6 +282,21 @@ static int jz4740_rtc_probe(struct platform_device *pdev) + } + } + ++ rtc_clk = clk_get(&pdev->dev, "rtc"); ++ if (IS_ERR(rtc_clk)) { ++ dev_err(&pdev->dev, "Failed to get RTC clock\n"); ++ goto err_free_irq; ++ } ++ ++ /* TODO: initialize the ADJC bits (25:16) to fine-tune ++ * the accuracy of the RTC */ ++ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_REGULATOR, ++ (clk_get_rate(rtc_clk) - 1) & 0xffff); ++ clk_put(rtc_clk); ++ ++ if (ret) ++ dev_warn(&pdev->dev, "Could not update RTC regulator register\n"); ++ + return 0; + + err_free_irq: +-- +1.7.10.4 + |