From: Sean Anderson <seanga2@gmail.com>
To: u-boot@lists.denx.de
Subject: [PATCH v11 17/21] riscv: Try to get cpu frequency from a "clocks" node if it exists
Date: Wed, 20 May 2020 02:41:07 -0400 [thread overview]
Message-ID: <20200520064111.317605-18-seanga2@gmail.com> (raw)
In-Reply-To: <20200520064111.317605-1-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 cb04f5638d..2d44d1c17b 100644
--- a/drivers/cpu/riscv_cpu.c
+++ b/drivers/cpu/riscv_cpu.c
@@ -3,6 +3,7 @@
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
+#include <clk.h>
#include <common.h>
#include <cpu.h>
#include <dm.h>
@@ -11,6 +12,7 @@
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <linux/bitops.h>
+#include <linux/err.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -29,9 +31,24 @@ 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)
--
2.26.2
next prev parent reply other threads:[~2020-05-20 6:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 6:40 [PATCH v11 00/21] riscv: Add Sipeed Maix support Sean Anderson
2020-05-20 6:40 ` [PATCH v11 01/21] clk: Always use the supplied struct clk Sean Anderson
2020-05-20 6:40 ` [PATCH v11 02/21] clk: Check that ops of composite clock components exist before calling Sean Anderson
2020-05-20 6:40 ` [PATCH v11 03/21] clk: Unconditionally recursively en-/dis-able clocks Sean Anderson
2020-05-20 6:40 ` [PATCH v11 04/21] clk: Fix clk_get_by_* handling of index Sean Anderson
2020-05-20 6:40 ` [PATCH v11 05/21] clk: Add K210 pll support Sean Anderson
2020-05-20 6:40 ` [PATCH v11 06/21] clk: Add a bypass clock for K210 Sean Anderson
2020-05-20 6:40 ` [PATCH v11 07/21] clk: Add K210 clock support Sean Anderson
2020-05-20 6:40 ` [PATCH v11 08/21] dm: Add support for simple-pm-bus Sean Anderson
2020-05-20 6:40 ` [PATCH v11 09/21] dm: Fix error handling for dev_read_addr_ptr Sean Anderson
2020-05-20 6:41 ` [PATCH v11 10/21] reset: Add generic reset driver Sean Anderson
2020-05-20 6:41 ` [PATCH v11 11/21] lib: Always set errno in hcreate_r Sean Anderson
2020-05-20 6:41 ` [PATCH v11 12/21] riscv: Add headers for asm/global_data.h Sean Anderson
2020-05-20 6:41 ` [PATCH v11 13/21] riscv: Clear pending interrupts before enabling IPIs Sean Anderson
2020-05-20 6:41 ` [PATCH v11 14/21] riscv: Clean up IPI initialization code Sean Anderson
2020-05-20 7:52 ` Rick Chen
2020-05-20 6:41 ` [PATCH v11 15/21] riscv: Add option to support RISC-V privileged spec 1.9 Sean Anderson
2020-05-20 6:41 ` [PATCH v11 16/21] riscv: Allow use of reset drivers Sean Anderson
2020-05-20 6:41 ` Sean Anderson [this message]
2020-05-20 6:41 ` [PATCH v11 18/21] riscv: Enable cpu clock if it is present Sean Anderson
2020-05-20 6:41 ` [PATCH v11 19/21] riscv: Add device tree for K210 and Sipeed Maix BitM Sean Anderson
2020-05-20 6:41 ` [PATCH v11 20/21] doc: riscv: Add documentation for Sipeed Maix Bit Sean Anderson
2020-05-20 6:41 ` [PATCH v11 21/21] riscv: Add Sipeed Maix support Sean Anderson
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