From: Sean Anderson <seanga2@gmail.com>
To: u-boot@lists.denx.de
Subject: [PATCH v5 30/33] riscv: Try to get cpu frequency from a "clocks" node if it exists
Date: Fri, 28 Feb 2020 16:05:48 -0500 [thread overview]
Message-ID: <20200228210552.615672-31-seanga2@gmail.com> (raw)
In-Reply-To: <20200228210552.615672-1-seanga2@gmail.com>
Instead of always using the "clock-frequency" property to determine cpu
frequency, try using a clock in "clocks" if it exists. This patch also
fixes a bug where there could be spurious higher frequencies if sizeof(u32)
!= sizeof(ulong).
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
This patch was previously sumbitted on its own as
https://patchwork.ozlabs.org/patch/1232420/
This patch is the combination of the patches
https://patchwork.ozlabs.org/patch/1223933/
https://patchwork.ozlabs.org/patch/1224957/
"riscv: Fix incorrect cpu frequency on RV64"
"riscv: Try to get cpu frequency from device tree"
Changes in v5:
- Include linux/err.h explicitly
- Reword commit message
Changes in v4:
- New
drivers/cpu/riscv_cpu.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/cpu/riscv_cpu.c b/drivers/cpu/riscv_cpu.c
index 28ad0aa30f..c6ed060abc 100644
--- a/drivers/cpu/riscv_cpu.c
+++ b/drivers/cpu/riscv_cpu.c
@@ -3,12 +3,14 @@
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
+#include <clk.h>
#include <common.h>
#include <cpu.h>
#include <dm.h>
#include <errno.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
+#include <linux/err.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -27,9 +29,24 @@ static int riscv_cpu_get_desc(struct udevice *dev, char *buf, int size)
static int riscv_cpu_get_info(struct udevice *dev, struct cpu_info *info)
{
+ int ret;
+ struct clk clk;
const char *mmu;
- dev_read_u32(dev, "clock-frequency", (u32 *)&info->cpu_freq);
+ /* Zero out the frequency, in case sizeof(ulong) != sizeof(u32) */
+ info->cpu_freq = 0;
+
+ /* First try getting the frequency from the assigned clock */
+ ret = clk_get_by_index(dev, 0, &clk);
+ if (!ret) {
+ ret = clk_get_rate(&clk);
+ if (!IS_ERR_VALUE(ret))
+ info->cpu_freq = ret;
+ clk_free(&clk);
+ }
+
+ if (!info->cpu_freq)
+ dev_read_u32(dev, "clock-frequency", (u32 *)&info->cpu_freq);
mmu = dev_read_string(dev, "mmu-type");
if (!mmu)
--
2.25.0
next prev parent reply other threads:[~2020-02-28 21:05 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 21:05 [PATCH v5 00/33] riscv: Add Sipeed Maix support Sean Anderson
2020-02-28 21:05 ` [PATCH v5 01/33] clk: Always use the supplied struct clk Sean Anderson
2020-02-28 21:05 ` [PATCH v5 02/33] clk: Check that ops of composite clock components exist before calling Sean Anderson
2020-02-28 21:05 ` [PATCH v5 03/33] clk: Unconditionally recursively en-/dis-able clocks Sean Anderson
2020-03-04 6:50 ` Rick Chen
2020-02-28 21:05 ` [PATCH v5 04/33] clk: Add functions to register CCF clock structs Sean Anderson
2020-02-28 21:05 ` [PATCH v5 05/33] clk: Add K210 pll support Sean Anderson
2020-02-28 21:05 ` [PATCH v5 06/33] clk: Add a bypass clock for K210 Sean Anderson
2020-02-28 21:05 ` [PATCH v5 07/33] clk: Add K210 clock support Sean Anderson
2020-03-04 6:58 ` Rick Chen
2020-03-04 14:54 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 08/33] doc: Fix typo in FIT documentation Sean Anderson
2020-03-02 2:21 ` Bin Meng
2020-02-28 21:05 ` [PATCH v5 09/33] dm: Add support for simple-pm-bus Sean Anderson
2020-02-28 21:05 ` [PATCH v5 10/33] dm: Fix error handling for dev_read_addr_ptr Sean Anderson
2020-03-02 2:22 ` Bin Meng
2020-03-02 19:46 ` Simon Glass
2020-02-28 21:05 ` [PATCH v5 11/33] reset: Add generic reset driver Sean Anderson
2020-02-28 21:05 ` [PATCH v5 12/33] lib: Always set errno in hcreate_r Sean Anderson
2020-03-02 2:24 ` Bin Meng
2020-02-28 21:05 ` [PATCH v5 13/33] pinctrl: Add support for Kendryte K210 FPIOA Sean Anderson
2020-03-04 6:47 ` Rick Chen
2020-03-04 15:00 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 14/33] gpio: sifive: Use generic reg read function Sean Anderson
2020-03-02 2:24 ` Bin Meng
2020-02-28 21:05 ` [PATCH v5 15/33] gpio: dw: Fix warnings about casting int to pointer Sean Anderson
2020-03-02 2:27 ` Bin Meng
2020-03-02 3:50 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 16/33] gpio: dw: Add a trailing underscore to generated name Sean Anderson
2020-02-28 21:05 ` [PATCH v5 17/33] gpio: dw: Return output value when direction is out Sean Anderson
2020-02-28 21:05 ` [PATCH v5 18/33] led: gpio: Default to using node name if label is absent Sean Anderson
2020-02-28 21:05 ` [PATCH v5 19/33] spi: dw: Add device tree properties for fields in CTRL1 Sean Anderson
2020-03-04 6:15 ` Rick Chen
2020-03-04 15:01 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 20/33] spi: dw: Rename "cs-gpio" to "cs-gpios" Sean Anderson
2020-02-28 21:05 ` [PATCH v5 21/33] spi: dw: Use generic function to read reg address Sean Anderson
2020-02-28 21:05 ` [PATCH v5 22/33] spi: dw: Speed up transfer loops Sean Anderson
2020-02-28 21:05 ` [PATCH v5 23/33] spi: dw: Properly set rx_end when not recieving Sean Anderson
2020-02-29 17:47 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 24/33] spi: dw: Add mem_ops Sean Anderson
2020-02-28 21:05 ` [PATCH v5 25/33] wdt: Move asm/utils.h to log2.h Sean Anderson
2020-02-28 21:46 ` Marek Vasut
2020-02-28 22:43 ` Sean Anderson
2020-02-28 23:27 ` Marek Vasut
2020-03-03 6:58 ` Rick Chen
2020-03-03 14:11 ` Sean Anderson
2020-02-28 21:05 ` [PATCH v5 26/33] riscv: Add headers for asm/global_data.h Sean Anderson
2020-02-28 21:05 ` [PATCH v5 27/33] riscv: Fix race conditions when initializing IPI Sean Anderson
2020-03-02 9:08 ` Rick Chen
2020-03-02 15:43 ` Sean Anderson
2020-03-02 23:15 ` Lukas Auer
2020-03-03 8:27 ` Rick Chen
2020-03-05 2:18 ` Rick Chen
2020-03-02 23:17 ` Lukas Auer
2020-03-02 23:43 ` Sean Anderson
2020-03-03 21:53 ` Lukas Auer
2020-03-03 21:57 ` Sean Anderson
2020-03-04 15:25 ` Lukas Auer
2020-02-28 21:05 ` [PATCH v5 28/33] riscv: Add option to support RISC-V privileged spec 1.9 Sean Anderson
2020-03-04 6:20 ` Rick Chen
2020-02-28 21:05 ` [PATCH v5 29/33] riscv: Allow use of reset drivers Sean Anderson
2020-02-28 21:05 ` Sean Anderson [this message]
2020-02-28 21:05 ` [PATCH v5 31/33] riscv: Enable cpu clock if it is present Sean Anderson
2020-02-28 21:05 ` [PATCH v5 32/33] riscv: Add device tree for K210 and Sipeed Maix BitM Sean Anderson
2020-02-28 21:05 ` [PATCH v5 33/33] riscv: Add Sipeed Maix support Sean Anderson
2020-03-04 6:04 ` Rick Chen
2020-03-04 7:47 ` Rick Chen
2020-03-04 15:11 ` Sean Anderson
2020-03-05 3:40 ` Bin Meng
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