[PATCH V2 4/5] spmi: pmic-arb: return the value instead of passing by pointer

Kiran Gunda
2017-07-10T12:45:06Z

Returning the output value from a function, when it is possible, is the
better and cleaner way than passing it by the pointer. Hence, modify
the ppid_to_apid mapping function to return apid instead of passing
it by a pointer. While at it, pass the ppid as function parameter to
ppid_to_apid mapping function instead of passing the sid and addr.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/spmi/spmi-pmic-arb.c | 82 +++++++++++++++++++++-----------------------
1 file changed, 40 insertions(+), 42 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 83ed33c..416b404 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -178,11 +178,9 @@ struct spmi_pmic_arb {
*/
struct pmic_arb_ver_ops {
const char *ver_str;
- int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
- u16 *apid);
+ int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
/* spmi commands (read_cmd, write_cmd, cmd) functionality */
- int (*offset)(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
- u32 *offset);
+ int (*offset)(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr);
u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc);
int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid);
/* Interrupts controller functionality (offset of PIC registers) */
@@ -242,10 +240,11 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
u32 offset;
int rc;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset);
- if (rc)
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ if (rc < 0)
return rc;

+ offset = rc;
offset += PMIC_ARB_STATUS;

while (timeout--) {
@@ -289,10 +288,11 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, 0, &offset);
- if (rc)
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, 0);
+ if (rc < 0)
return rc;

+ offset = rc;
cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);

raw_spin_lock_irqsave(&pmic_arb->lock, flags);
@@ -333,10 +333,11 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset);
- if (rc)
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ if (rc < 0)
return rc;

+ offset = rc;
if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
dev_err(&ctrl->dev, "pmic-arb supports 1..%d bytes per trans, but:%zu requested",
PMIC_ARB_MAX_TRANS_BYTES, len);
@@ -383,10 +384,11 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
int rc;
u32 offset;

- rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset);
- if (rc)
+ rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
+ if (rc < 0)
return rc;

+ offset = rc;
if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
dev_err(&ctrl->dev, "pmic-arb supports 1..%d bytes per trans, but:%zu requested",
PMIC_ARB_MAX_TRANS_BYTES, len);
@@ -656,8 +658,8 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
unsigned int *out_type)
{
struct spmi_pmic_arb *pmic_arb = d->host_data;
+ u16 apid, ppid;
int rc;
- u16 apid;

dev_dbg(&pmic_arb->spmic->dev, "intspec[0] 0x%1x intspec[1] 0x%02x intspec[2] 0x%02x\n",
intspec[0], intspec[1], intspec[2]);
@@ -669,14 +671,15 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
if (intspec[0] > 0xF || intspec[1] > 0xFF || intspec[2] > 0x7)
return -EINVAL;

- rc = pmic_arb->ver_ops->ppid_to_apid(pmic_arb, intspec[0],
- (intspec[1] << 8), &apid);
+ ppid = intspec[0] << 8 | intspec[1];
+ rc = pmic_arb->ver_ops->ppid_to_apid(pmic_arb, ppid);
if (rc < 0) {
dev_err(&pmic_arb->spmic->dev, "failed to xlate sid = 0x%x, periph = 0x%x, irq = %x rc = %d\n",
intspec[0], intspec[1], intspec[2], rc);
return rc;
}

+ apid = rc;
/* Keep track of {max,min}_apid for bounding search during interrupt */
if (apid > pmic_arb->max_apid)
pmic_arb->max_apid = apid;
@@ -705,19 +708,18 @@ static int qpnpint_irq_domain_map(struct irq_domain *d,
return 0;
}

-static int pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pmic_arb, u8 sid,
- u16 addr, u16 *apid)
+static int pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pmic_arb, u16 ppid)
{
- u16 ppid = sid << 8 | ((addr >> 8) & 0xFF);
u32 *mapping_table = pmic_arb->mapping_table;
int index = 0, i;
u16 apid_valid;
+ u16 apid;
u32 data;

apid_valid = pmic_arb->ppid_to_apid[ppid];
if (apid_valid & PMIC_ARB_APID_VALID) {
- *apid = apid_valid & ~PMIC_ARB_APID_VALID;
- return 0;
+ apid = apid_valid & ~PMIC_ARB_APID_VALID;
+ return apid;
}

for (i = 0; i < SPMI_MAPPING_TABLE_TREE_DEPTH; ++i) {
@@ -731,21 +733,21 @@ static int pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pmic_arb, u8 sid,
if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) {
index = SPMI_MAPPING_BIT_IS_1_RESULT(data);
} else {
- *apid = SPMI_MAPPING_BIT_IS_1_RESULT(data);
+ apid = SPMI_MAPPING_BIT_IS_1_RESULT(data);
pmic_arb->ppid_to_apid[ppid]
- = *apid | PMIC_ARB_APID_VALID;
- pmic_arb->apid_data[*apid].ppid = ppid;
- return 0;
+ = apid | PMIC_ARB_APID_VALID;
+ pmic_arb->apid_data[apid].ppid = ppid;
+ return apid;
}
} else {
if (SPMI_MAPPING_BIT_IS_0_FLAG(data)) {
index = SPMI_MAPPING_BIT_IS_0_RESULT(data);
} else {
- *apid = SPMI_MAPPING_BIT_IS_0_RESULT(data);
+ apid = SPMI_MAPPING_BIT_IS_0_RESULT(data);
pmic_arb->ppid_to_apid[ppid]
- = *apid | PMIC_ARB_APID_VALID;
- pmic_arb->apid_data[*apid].ppid = ppid;
- return 0;
+ = apid | PMIC_ARB_APID_VALID;
+ pmic_arb->apid_data[apid].ppid = ppid;
+ return apid;
}
}
}
@@ -754,11 +756,9 @@ static int pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pmic_arb, u8 sid,
}

/* v1 offset per ee */
-static int pmic_arb_offset_v1(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
- u32 *offset)
+static int pmic_arb_offset_v1(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr)
{
- *offset = 0x800 + 0x80 * pmic_arb->channel;
- return 0;
+ return 0x800 + 0x80 * pmic_arb->channel;
}

static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
@@ -797,10 +797,8 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
return i;
}

-static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u8 sid,
- u16 addr, u16 *apid)
+static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u16 ppid)
{
- u16 ppid = (sid << 8) | (addr >> 8);
u16 apid_valid;

apid_valid = pmic_arb->ppid_to_apid[ppid];
@@ -809,23 +807,23 @@ static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u8 sid,
if (!(apid_valid & PMIC_ARB_APID_VALID))
return -ENODEV;

- *apid = apid_valid & ~PMIC_ARB_APID_VALID;
- return 0;
+ return apid_valid & ~PMIC_ARB_APID_VALID;
}

/* v2 offset per ppid and per ee */
-static int pmic_arb_offset_v2(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
- u32 *offset)
+static int pmic_arb_offset_v2(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr)
{
u16 apid;
+ u16 ppid;
int rc;

- rc = pmic_arb_ppid_to_apid_v2(pmic_arb, sid, addr, &apid);
+ ppid = sid << 8 | ((addr >> 8) & 0xFF);
+ rc = pmic_arb_ppid_to_apid_v2(pmic_arb, ppid);
if (rc < 0)
return rc;

- *offset = 0x1000 * pmic_arb->ee + 0x8000 * apid;
- return 0;
+ apid = rc;
+ return 0x1000 * pmic_arb->ee + 0x8000 * apid;
}

static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u16 addr, u8 bc)