iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: pasemi: Allow to configure bus frequency

Browse Source 
Right now the bus frequency has always been hardcoded as
100 KHz with the specific reference clock used in the PASemi
PCI controllers. Make this configurable to prepare for the
platform driver.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Acked-by: Olof Johansson <olof@lixom.net>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Sven Peter 2021-10-08 18:35:29 +02:00 committed by Wolfram Sang
parent 1a62668cef
commit fd664ab231
3 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/i2c/busses/i2c-pasemi-core.c
View File

@ -39,9 +39,6 @@
#define CTL_MTR 0x00000200
#define CTL_CLK_M 0x000000ff
#define CLK_100K_DIV 84
#define CLK_400K_DIV 21
static inline void reg_write(struct pasemi_smbus *smbus, int reg, int val)
{
dev_dbg(smbus->dev, "smbus write reg %lx val %08x\n",
@ -63,8 +60,9 @@ static inline int reg_read(struct pasemi_smbus *smbus, int reg)
static void pasemi_reset(struct pasemi_smbus *smbus)
{
reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
(CLK_100K_DIV & CTL_CLK_M)));
u32 val = (CTL_MTR | CTL_MRR | (smbus->clk_div & CTL_CLK_M));
reg_write(smbus, REG_CTL, val);
}
static void pasemi_smb_clear(struct pasemi_smbus *smbus)

1
drivers/i2c/busses/i2c-pasemi-core.h
View File

@ -14,6 +14,7 @@ struct pasemi_smbus {
void __iomem *ioaddr;
unsigned long base;
int size;
unsigned int clk_div;
};
int pasemi_i2c_common_probe(struct pasemi_smbus *smbus);

4
drivers/i2c/busses/i2c-pasemi-pci.c
View File

@ -17,6 +17,9 @@
#include "i2c-pasemi-core.h"
#define CLK_100K_DIV 84
#define CLK_400K_DIV 21
static struct pci_driver pasemi_smb_pci_driver;
static int pasemi_smb_pci_probe(struct pci_dev *dev,
@ -35,6 +38,7 @@ static int pasemi_smb_pci_probe(struct pci_dev *dev,
smbus->dev = &dev->dev;
smbus->base = pci_resource_start(dev, 0);
smbus->size = pci_resource_len(dev, 0);
smbus->clk_div = CLK_100K_DIV;
if (!request_region(smbus->base, smbus->size,
pasemi_smb_pci_driver.name)) {