media: ccs-pll: Make variables const where appropriate

Many functions operate on data structures that are read only, both in
the implementation and by design. Mark them as const to increase
readability and avoid future mistakes.

Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: pinchartl

drivers/media/i2c/ccs-pll.c

@@ -75,11 +75,11 @@ static const char *pll_string(unsigned int which)
 
 #define PLL_FL(f) CCS_PLL_FLAG_##f
 
-static void print_pll(struct device *dev, struct ccs_pll *pll)
+static void print_pll(struct device *dev, const struct ccs_pll *pll)
 {
 	const struct {
-		struct ccs_pll_branch_fr *fr;
-		struct ccs_pll_branch_bk *bk;
+		const struct ccs_pll_branch_fr *fr;
+		const struct ccs_pll_branch_bk *bk;
 		unsigned int which;
 	} branches[] = {
 		{ &pll->vt_fr, &pll->vt_bk, PLL_VT },
@@ -150,10 +150,10 @@ static u32 op_pix_ddr(u32 flags)
 
 static int check_fr_bounds(struct device *dev,
 			   const struct ccs_pll_limits *lim,
-			   struct ccs_pll *pll, unsigned int which)
+			   const struct ccs_pll *pll, unsigned int which)
 {
 	const struct ccs_pll_branch_limits_fr *lim_fr;
-	struct ccs_pll_branch_fr *pll_fr;
+	const struct ccs_pll_branch_fr *pll_fr;
 	const char *s = pll_string(which);
 	int rval;
 
@@ -190,10 +190,10 @@ static int check_fr_bounds(struct device *dev,
 
 static int check_bk_bounds(struct device *dev,
 			   const struct ccs_pll_limits *lim,
-			   struct ccs_pll *pll, unsigned int which)
+			   const struct ccs_pll *pll, unsigned int which)
 {
 	const struct ccs_pll_branch_limits_bk *lim_bk;
-	struct ccs_pll_branch_bk *pll_bk;
+	const struct ccs_pll_branch_bk *pll_bk;
 	const char *s = pll_string(which);
 	int rval;
 
@@ -230,7 +230,7 @@ static int check_bk_bounds(struct device *dev,
 	return rval;
 }
 
-static int check_ext_bounds(struct device *dev, struct ccs_pll *pll)
+static int check_ext_bounds(struct device *dev, const struct ccs_pll *pll)
 {
 	if (!(pll->flags & CCS_PLL_FLAG_FIFO_DERATING) &&
 	    pll->pixel_rate_pixel_array > pll->pixel_rate_csi) {