From: Marc Kleine-Budde Date: Mon, 25 Nov 2013 21:15:21 +0000 (+0100) Subject: ARM i.MX5: set CAN peripheral clock to 24 MHz parent X-Git-Tag: v3.14-rc1~113^2~10^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=10471fa3c779e6a1f5fafafc4ab86f1119bb90e0;p=kernel%2Fkernel-generic.git ARM i.MX5: set CAN peripheral clock to 24 MHz parent This patch sets the parent of CAN peripheral clock (a.k.a. CPI clock) to the lp_apm clock, which has a rate of 24 MHz. In the CAN world a base clock with multiple of 8 MHz is suited best for all CIA recommented bit rates. Without this patch the CAN peripheral clock on i.MX53 has a rate of 66.666 MHz which produces quite large bit rate errors. Signed-off-by: Marc Kleine-Budde Signed-off-by: Shawn Guo --- diff --git a/arch/arm/mach-imx/clk-imx51-imx53.c b/arch/arm/mach-imx/clk-imx51-imx53.c index e349fd5..dff5ca9 100644 --- a/arch/arm/mach-imx/clk-imx51-imx53.c +++ b/arch/arm/mach-imx/clk-imx51-imx53.c @@ -584,6 +584,9 @@ static void __init mx53_clocks_init(struct device_node *np) clk_set_rate(clk[IMX5_CLK_ESDHC_A_PODF], 200000000); clk_set_rate(clk[IMX5_CLK_ESDHC_B_PODF], 200000000); + /* move can bus clk to 24MHz */ + clk_set_parent(clk[IMX5_CLK_CAN_SEL], clk[IMX5_CLK_LP_APM]); + clk_prepare_enable(clk[IMX5_CLK_IIM_GATE]); imx_print_silicon_rev("i.MX53", mx53_revision()); clk_disable_unprepare(clk[IMX5_CLK_IIM_GATE]);