staging: trivial: hikey9xx: fix be32<->u32 casting warnings

This patch fixes the following warnings reported by sparse, by adding
missing __force annotations.

drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32
drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32
drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32
drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32
drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32
drivers/staging/hikey9xx/hisi-spmi-controller.c:164:24: warning: cast to restricted __be32

drivers/staging/hikey9xx/hisi-spmi-controller.c:239:25: warning: cast from restricted __be32

Rationale for #164:
data is declared as u32, and it is read and then converted by means of
be32_to_cpu(). Said function expects a __be32 but data is u32, therefore
there's a type missmatch here.

Rationale for #239:
Is the dual of #164. This time data going to be  written so it
needs to be converted from cpu to __be32, but writel() expects u32 and the
output of cpu_to_be32 returns a __be32.

Signed-off-by: Juan Antonio Aldea-Armenteros <juant.aldea@gmail.com>
Link: https://lore.kernel.org/r/20201119122737.189675-1-juant.aldea@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/hikey9xx/hisi-spmi-controller.c b/drivers/staging/hikey9xx/hisi-spmi-controller.c
index f831c43f4783f1b2cafc6b4f73024f089c463dd2..861aedd5de4847c7208398b684bd343b651beeb4 100644 (file)
--- a/drivers/staging/hikey9xx/hisi-spmi-controller.c
+++ b/drivers/staging/hikey9xx/hisi-spmi-controller.c
@@ -161,7 +161,7 @@ static int spmi_read_cmd(struct spmi_controller *ctrl,
                             SPMI_SLAVE_OFFSET * slave_id +
                             SPMI_APB_SPMI_RDATA0_BASE_ADDR +
                             i * SPMI_PER_DATAREG_BYTE);
-               data = be32_to_cpu((__be32)data);
+               data = be32_to_cpu((__be32 __force)data);
                if ((bc - i * SPMI_PER_DATAREG_BYTE) >> 2) {
                        memcpy(buf, &data, sizeof(data));
                        buf += sizeof(data);
@@ -236,7 +236,7 @@ static int spmi_write_cmd(struct spmi_controller *ctrl,
                        buf += (bc % SPMI_PER_DATAREG_BYTE);
                }
 
-               writel((u32)cpu_to_be32(data),
+               writel((u32 __force)cpu_to_be32(data),
                       spmi_controller->base + chnl_ofst +
                       SPMI_APB_SPMI_WDATA0_BASE_ADDR +
                       SPMI_PER_DATAREG_BYTE * i);