From 35f84e1791eaae8c8c0f4798a5cba3061277a672 Mon Sep 17 00:00:00 2001 From: Jonathan Bell Date: Wed, 17 Apr 2024 17:03:56 +0100 Subject: [PATCH 1028/1085] DTS: overlays: fix Pi 5 midi-over-UART The UART source clock is 50MHz not 100MHz, so fix the fake-clock used to munge the baudrate. See https://forums.raspberrypi.com/viewtopic.php?p=2212755 Signed-off-by: Jonathan Bell --- arch/arm/boot/dts/overlays/midi-uart0-pi5-overlay.dts | 6 +++--- arch/arm/boot/dts/overlays/midi-uart1-pi5-overlay.dts | 6 +++--- arch/arm/boot/dts/overlays/midi-uart2-pi5-overlay.dts | 6 +++--- arch/arm/boot/dts/overlays/midi-uart3-pi5-overlay.dts | 6 +++--- arch/arm/boot/dts/overlays/midi-uart4-pi5-overlay.dts | 6 +++--- 5 files changed, 15 insertions(+), 15 deletions(-) --- a/arch/arm/boot/dts/overlays/midi-uart0-pi5-overlay.dts +++ b/arch/arm/boot/dts/overlays/midi-uart0-pi5-overlay.dts @@ -5,10 +5,10 @@ /* * Fake a higher clock rate to get a larger divisor, and thereby a lower - * baudrate. The real clock is 100MHz, which we scale so that requesting + * baudrate. The real clock is 50MHz, which we scale so that requesting * 38.4kHz results in an actual 31.25kHz. * - * 100000000*38400/31250 = 122880000 + * 50000000*38400/31250 = 61440000 */ /{ @@ -21,7 +21,7 @@ compatible = "fixed-clock"; #clock-cells = <0>; clock-output-names = "uart0_pclk"; - clock-frequency = <122880000>; + clock-frequency = <61440000>; }; }; }; --- a/arch/arm/boot/dts/overlays/midi-uart1-pi5-overlay.dts +++ b/arch/arm/boot/dts/overlays/midi-uart1-pi5-overlay.dts @@ -5,10 +5,10 @@ /* * Fake a higher clock rate to get a larger divisor, and thereby a lower - * baudrate. The real clock is 100MHz, which we scale so that requesting + * baudrate. The real clock is 50MHz, which we scale so that requesting * 38.4kHz results in an actual 31.25kHz. * - * 100000000*38400/31250 = 122880000 + * 50000000*38400/31250 = 61440000 */ /{ @@ -21,7 +21,7 @@ compatible = "fixed-clock"; #clock-cells = <0>; clock-output-names = "uart1_pclk"; - clock-frequency = <122880000>; + clock-frequency = <61440000>; }; }; }; --- a/arch/arm/boot/dts/overlays/midi-uart2-pi5-overlay.dts +++ b/arch/arm/boot/dts/overlays/midi-uart2-pi5-overlay.dts @@ -5,10 +5,10 @@ /* * Fake a higher clock rate to get a larger divisor, and thereby a lower - * baudrate. The real clock is 100MHz, which we scale so that requesting + * baudrate. The real clock is 50MHz, which we scale so that requesting * 38.4kHz results in an actual 31.25kHz. * - * 100000000*38400/31250 = 122880000 + * 50000000*38400/31250 = 61440000 */ /{ @@ -21,7 +21,7 @@ compatible = "fixed-clock"; #clock-cells = <0>; clock-output-names = "uart2_pclk"; - clock-frequency = <122880000>; + clock-frequency = <61440000>; }; }; }; --- a/arch/arm/boot/dts/overlays/midi-uart3-pi5-overlay.dts +++ b/arch/arm/boot/dts/overlays/midi-uart3-pi5-overlay.dts @@ -5,10 +5,10 @@ /* * Fake a higher clock rate to get a larger divisor, and thereby a lower - * baudrate. The real clock is 100MHz, which we scale so that requesting + * baudrate. The real clock is 50MHz, which we scale so that requesting * 38.4kHz results in an actual 31.25kHz. * - * 100000000*38400/31250 = 122880000 + * 50000000*38400/31250 = 61440000 */ /{ @@ -21,7 +21,7 @@ compatible = "fixed-clock"; #clock-cells = <0>; clock-output-names = "uart3_pclk"; - clock-frequency = <122880000>; + clock-frequency = <61440000>; }; }; }; --- a/arch/arm/boot/dts/overlays/midi-uart4-pi5-overlay.dts +++ b/arch/arm/boot/dts/overlays/midi-uart4-pi5-overlay.dts @@ -5,10 +5,10 @@ /* * Fake a higher clock rate to get a larger divisor, and thereby a lower - * baudrate. The real clock is 100MHz, which we scale so that requesting + * baudrate. The real clock is 50MHz, which we scale so that requesting * 38.4kHz results in an actual 31.25kHz. * - * 100000000*38400/31250 = 122880000 + * 50000000*38400/31250 = 61440000 */ /{ @@ -21,7 +21,7 @@ compatible = "fixed-clock"; #clock-cells = <0>; clock-output-names = "uart4_pclk"; - clock-frequency = <122880000>; + clock-frequency = <61440000>; }; }; };